For 1990-2009 cars

# PROM CALIBRATION/REPLACEMENT UPDATED DIAGNOSTICS

#### VEHICLES AFFECTED: 1980-1988 ELDORADO AND SEVILLE, 1980-88 RWD BROUGHAM, 1985-1988 DE VILLE AND FLEETWOOD, 1982-1988 CIMARRON

These charts summarize all 1980 through 1988 "C,D,E,K,V and J" gasoline engine PROM calibrations to date. When any diagnosis leads to PROM replacement, the service PROM part number listed should be used. Should any additional PROM calibration changes be made, the GMSPO parts distribution system will automatically supercede these service part numbers.

Prom changes may be made for different reasons. For instance, a calibration change may be made in conjunction with component changes, for a repair relative to a current field condition, or as a running change to provide minor modifications affecting driveability or fuel economy. Therefore, if a PROM I.D. is lower than the latest PROM available, it does not necessarily need replacement. Refer to the list for details about the symptom that may require a PROM change.

1980 E/K EQUIPPED WITH 6.0L DEFI V-8 ENGINE ------------------------------------------- DEFI - FEDERAL EMISSIONS* -------------------------

PRODUCTION SERVICE ECM SERVICE ECM BROADCAST CODE BROADCAST CODE PART NUMBER -------------- -------------- ------------ GEN 1: AC CJ 1224539

GEN 2: AD CJ 1224539

GEN 3: CJ CJ 1224539

*NOTE: The PROM is not replaceable separately on 1980 DEFI vehicles. A PROM is included in 1980 DEFI service ECM's.

1980 "C" EQUIPPED WITH 6.0L C-4 V-8 ENGINE AND CALIFORNIA EMISSIONS 1980 LIMOUSINE EQUIPPED WITH 6.0L C-4 V-8 ENGINE 1980-1984 COMMERCIAL CHASSIS EQUIPPED WITH 6.0L C-4 V-8 ENGINE

PROM SERVICE SERVICE PROM P/N BROADCAST CODE PART I.D. ---------------- -------------- ---------- 1224674 AF 1359

1981 C, D, E, AND K EQUIPPED WITH 6.0L MD-DFI V 8/6/4 ENGINE ------------------------------------------------------------ (BULLETIN 183-49) --------------- 1981-1984 LIMOUSINES EQUIPPED WITH 6.0L MD-DFI V 8/6/4 ENGINE ------------------------------------------------------------- FIRST GEN ECM's: ----------------

ECM PROM Service Service VIN Broadcast # Service P/N Part I.D. PROM P/N --------------- ----------- --------- -------- C FED 100001-130880 1224760 #1-5785LW 1225772 #2-5786LW

C CAL 100001-143985 1224760 #1-5785LW 1225772 #2-5786LW

E/K FED E 600001-616866 1224760 #1-5869BH 1225866 K 680001-690461 #2-5884BH

E/K CAL E 600001-617927 1224760 #1-5779KB 1225773 K 680001-691350 #2-5778KB

D FED 100001-130880 1225120 #1-7087LY 1225125 #2-7088LY

SECOND GEN ECM's: ----------------- C FED After 130880 1225120 #1-586OKK 1225775 #2-586IKK

C CAL After 143985 1225120 #1-586OKK 1225775 #2-586IKK

E/K FED E After 616866 1225120 #1-5853KJ 1225774 F After 690461 #2-5854KJ

E/K CAL E After 617927 1225120 #1-5853KJ 1225774 K After 691350 #2-5854KJ

D FED After 130880 1225120 #1-005OAAF 1225298

1981 PROM I.D.'s are on a sticker on top of the PROM

1981 C/E/K EQUIPPED WITH 4.1L V-6 CCC ------------------------------------- ECM SERVICE P/N 1224810 -----------------------

PRODUCTION SERVICE ECM PROM SERVICE SERVICE ECM BROADCAST CODE BROADCAST CODE PART I.D. PART NUMBER -------------- -------------- --------- ----------- GEN 1: ------- C DW ACF 1563 1225325 E/K DX-VERSION 1 DX-VERSION 2* 5994 1226079 CCAL LN ACH 1564 1225326 E/K CAL LM LM 6638 1224839

#### GEN 2:

C ACF ACF 1563 1225325 C CAL ACH ACH 1564 1225326 E/K DX-VERSION 2* DX-VERSION 2* 5994 1226079

* Retrofit - P/N 1226079 to reduce detonation.

PROM I.D.'s are on a sticker on top of the PROM

1982 C,E AND K EQUIPPED WITH 4.1L DFI V8 ENGINE ----------------------------------------------- SERVICE ECM P/N 1225650 ----------------------- PRODUCTION SERVICE LATEST BROADCAST CODE BROADCAST CODE SERVICE PROM (PROM I.D.) (PROM I.D.) PART NUMBER ----------- ----------- ----------- FIRST GEN: ---------- C FED WA (10) AUO(ll) 1225981 C CAL WB (20) AUP(21) 1225983 C EXPORT WC (30) WC (30) 1225655 C ALT WB (20) AUP(21) 1225983 E/K FED WD (40) AUR(41) 1225984 E/K CAL WF (50) AUS(51) 1225979 E/K EXPORT WH (60) WH (60) 1225657 E/K ALT WF (50) AUS(51) 1225979 E/K FED DIG* AAH(70) AUT(71) 1225980 E/K CAL DIG* AAJ(80) AUU(81) 1225982 E/K EXPORT DIG* AAK(90) AAK(90) 1225659 E/K ALT DIG* AHN(180) AHN(180) 7225667

#### SECOND GEN:

C FED AUO(11) AUO(ll) 1225981 C CAL AUP(21) AUP(21) 1225983 C ALT AHL(120) AHL(120) 1226038 E/K FED AUR(41) AUR(41) 1225984 E/K CAL AUS(51) AUS(51) 1225979 E/K ALT AHM(150) AHM(150) 1225666 E/K FED DIG* AUT(71) AUT(71) 1225980 E/K CAL DIG* AUU(81) AUU(81) 1225982 E/K ALT DIG* AHN(180) AHN(180) 1225667

*DIG = DIGITAL INSTRUMENT CLUSTER

PROM I.D. is ECM data parameter .1.3

1982 C, E, AND K EQUIPPED WITH 4.1L CLCC V6 ENGINE -------------------------------------------------- ECM SERVICE P/N 1225500 -----------------------

PRODUCTION SERVICE SERVICE PROM SERVICE PROM BROADCAST CODE BROADCAST CODE PART I.D. PART NUMBER -------------- -------------- --------- -----------

#### FIRST GEN:

C FED NA ART 5333 1225909 C CAL NB ARU 5327 1225910 E/K FED ND ASU 9860 1225976 E/K CAL NF ASX 5593 1225977 E/K EXP AUY AUY 6422 1225978

#### SECOND GEN:

C FED ART ART 5333 1225909 C CAL ARU ARU 5327 1225910 E/K FED ASU ASU 9860 1225976 E/K CAL ASX ASX 5593 1225977

PROM I.D.'s are on a sticker on top of the PROM

1982 J EQUIPPED WITH 1.8L CCC L-4 ENGINE ---------------------------------------- SERVICE ECM P/N 1225500 ------------------------

LATEST SERVICE PRODUCTION SERVICE SERVICE PROM BEGIN END BROADCAST BROADCAST PROM PART B.P. B.P. CODE CODE PART I.D. NUMBER ---- ---- ---- ---- --------- -------

#### FIRST GEN:

FED AUTO 400001 416172 AMM AMM 3425 1226055 416173 421979 BKY BKW 7654 1226047 421980 432258 BKW BKW 7654 1226047 CAL AUTO 400001 416172 AMM AMM 3425 1226057 416173 432258 BKY BKY 7665 1226049 ALL MANUAL 400001 416172 AML AML 1376 1226721 416173 423220 ADN ADN 1464 1225753 423221 432258 AWB AWB 1336 1225751

#### SECOND GEN:

FED AUTO 400001 416172 AMM AMM 3425 1226055 416173 421979 BKW BKW 7654 1226047 421980 432258 BKW BKW 7654 1226047 CAL AUTO 400001 416172 AMM AMM 3425 1226057 416173 432258 BKY BKY 7665 1226049 ALL MANUAL 400001 416172 AML AML 1376 1226721 416173 423220 ADN ADN 1464 1225753 423221 432258 AWB AWB 1336 1225751

PROM I.D.'s are on a sticker on top of the PROM

1983 C,E/K EQUIPPED WITH 4.1L DFI V-8 ENGINE -------------------------------------------- SERVICE ECM P/N 1226028 OR P/N 1226930 --------------------------------------

PRODUCTION SERVICE LATEST BROADCAST CODE BROADCAST CODE SERVICE PROM (PROM I.D.) (PROM I.D.) PART NUMBER FIRST GEN: ------------ ----------- ----------- ---------- C FED AFY(12) CTK(14) 1226529* C CAL AFZ(22) CTL(24) 1226530* C EXPORT AHA(31) CTM(33) 1226531 C ALT AXK(121) CTW(123) 1226538 E/K FED AHB(42) CTN(44) 1226532* E/K CAL AHC(52) CTP(54) 1226533* E/K EXPORT AHD(61) CTR(63) 1226534 E/K ALT AXL(151) CTX(153) 1226539 E/K FED DIG AHF(72) CTS(74) 1226535* E/K CAL DIG AHH(82) CTT(84) 1226536* E/K EXPORT DIG AHJ(91) CTU(93) 1226537 E/K ALT DIG AXM(181) CTY(183) 1226540

#### SECOND GEN:

C FED CCD(13) CTK(14) 1226529* C CAL CCF(23) CTL(24) 1226530 C ALT CC(122) CTW(123) 1226538 E/K FED CCJ(43) CTN(44) 1226532* E/K CAL CCK(53) CTP(54) 1226533* E/K ALT CCS(152) CTX(153) 1226539 E/K FED DIG CCM(73) CTS(74) 1226535* E/K CAL DIG CCN(83) CTT(84) 1226536* E/K ALT DIG CCT(182) CTY(183) 1226540

#### THIRD GEN:

C FED CTK(14) CTK(14) 1226529* C CAL CTL(24) CTL(24) 1226530* C EXPORT CTM(33) CTM(33) 1226531 C ALT CTW(123) CTW(123) 1226538 E/KFED CTN(44) CTN(44) 1226532* E/KCAL CTP(54) CTP(54) 1226533* E/K EXPORT CTR(63) CTR(63) 1226534 E/K ALT CTX(153) CTX(153) 1226539 E/K FED DIG CTS(74) CTS(74) 1226535* E/K CAL DIG CTT(84) CTT(84) 1226536* E/K EXPORT DIG CTU(93) CTU(93) 1226537 E/K ALT DIG CTY(183) CTY(183) 1226540

* For 52-60 MPFI surge complaint, use fourth GEN P/N -

PROM I.D. is ECM data parameter .1.3 TEXT ZONE

1983 C, E AND K EQUIPPED WITH 4.1L DFI V-8 ENGINE (CONT'D) ----------------------------------------------------------

PRODUCTION SERVICE LATEST BROADCAST CODE BROADCAST CODE SERVICE PROM (PROM I.D.) (PROM I.D.) PART NUMBER ----------- ----------- ----------- FOURTH GEN: ----------- C FED PROM's only CTK (100) 1227321** C CAL available as CTL (26) 1226834** E/K FED retrofit CTN (132) 1227157** E/K CAL CTP (57) 1226835** E/K FED DIG* CTS (162) 1227158** E/K CAL DIG* CTT (87) 1226836**

*DIG = DIGITAL INSTRUMENT CLUSTER

**These PROM's to be applied only to correct 52-60 MPH surge or chuggle. See third GEN for regular service replacement.

PROM I.D. is ECM data parameter .1.3

1983 J EQUIPPED WITH 2.0L EFI L-4 ENGINE ---------------------------------------- SERVICE ECM P/N 1226026 -----------------------

SERVICE LATEST PRODUCTION SERVICE PROM SERVICE PROM BROADCAST CODE BROADCAST CODE PART I.D. PART NUMBER -------------- -------------- --------- -----------

#### FIRST GEN:

FED AUTO BAJ CDT-VERSION 2 6472 1226472 FED MANUAL AMR CDU 3962 1226473 CAL AUTO BAH CDZ-VERSION 2 0236 1226985 CAL MANUAL BAA CFA 3986 1226477

#### SECOND GEN:

FED AUTO CDT-VERSION I CDT-VERSION 2 2178 1226789** FED MANUAL CDU CDU 3962 1226473 CAL AUTO CDZ-VERSION I CDZ-VERSION 2 0236 1226985** CAL MANUAL CFA CFA 3986 1226477

#### THIRD GEN:

FED AUTO PROM's available CDT-VERSION 2 2178 1226789 CAL AUTO* only as retrofit CDZ-VERSION 2 0236 1226985

#### FOURTH GEN:

FED AUTO PROM's available CDT-VERSION 3 4128 1227254 only as retrofit

*For detonation - running production change at B.C. 410423.

**CDT and CDZ version 1 PROM's were superseded by CDT and CDZ version 2 PROM's

***Retrofit for detonation only - for regular service replacement, use first GEN.

****Retrofit for cold startability only

PROM I.D.'s are on a sticker-on top of the PROM

1984 D, E AND K EQUIPPED WITH 4.1L DFI V-8 ENGINE ------------------------------------------------- SERVICE ECM P/N 1226028 OR 1226930 ----------------------------------

PRODUCTION SERVICE LATEST BROADCAST CODE BROADCAST CODE SERVICE PROM (PROM I.D.) (PROM I.D.) PART NUMBER ----------- ----------- ------------ GEN 1: ------ D FED CAN(15) DMW(16) 16042063 D CAL DBB(25) DRD(27) 16042787 D EXPORT DBC(35) DMK(35) 16042036 D OPT AXLE DBN(124) DMU(124) 16042060 E/K FED CAT(45) DMY(47) 16042069** E/K CAL DBF(55) DMM(55) 16042042 E/K EXPORT DBJ(65) DMP(65) 16042048 E/K & E CONV OPT AXLE CAX(154) DLZ(154) 16042010 E FED CONV CYP(46) DMA(46) 16042O14 E CAL CONV CYS(56) DMC(56) 16042020 E/K FED DIG CAO(75) DMX(77) 16042066** E/K CAL DIG DBH(85) DMN(85) 16042045 E/K EXPORT DIG DBK(95) DMR(95) 16042051 E/K & E CONV OPT AXLE DIG CAS(184) DLW(184) 16042000 E FED CONV DIG CYR(76) DMB(76) 16042017 E CAL CONV DIG CYT(86) DMD(86) 16042024

#### GEN 2:

D FED DCM(16) DMW(16) 16042063 E/K FED DCP(47) DMY(47) 16042069** E/K FED DIG DCN(77) DMX(77) 16042066**

#### GEN 3:

D FED DMW(16) DMW(16) 16042063 D CAL DMJ(25) DRD(26) 16042787 D EXPORT DMK(35) DMK(35) 16042036 D OPT AXLE DMU(124) DMU(124) 16042060 E/K FED DMY(47) DMY(47) 16042069** E/K CAL DMM(55) DMM(55) 16042042 E/K EXPORT DMP(65) DMP(65) 16042048 E/K & E CONV OPT AXLE DLZ(154) DLZ(154) 16042010 E FED CONV DMA(46) DMA(46) 16O42014 E CAL CONV DMC(56) DMC(56) 16042020 E/K FED DIG DMX(77) DMX(77) 16042066**

1984 D,E AND K EQUIPPED WITH 4.1L DFI V-8 ENGINE (CONT'D) ---------------------------------------------------------- SERVICE ECM P/N 1226028, 1226930 OR 1226463 -------------------------------------------

PRODUCTION SERVICE LATEST BROADCAST CODE BROADCAST CODE SERVICE PROM (PROM I.D.) (PROM I.D.) PART NUMBER ----------- ----------- ----------- E/K CAL DIG DMN(85) DMN(85) 16042045 E/K EXPORT DIG DMR(95) DMR(95) 16042051 E/K & E CONV OPT AXLE DIG DLW(184) DLW(184) 16042000 E FED CONV DIG DMB(76) DMB(76) 16042017 E CAL CONV DIG DMD(86) DMD(86) 16042024

#### GEN 4:

DM/DW CAL DRD(26) DRD(26) 16042787 DM/DW FED* PROM's available DMW(101 1227322 E/K FED* only for retrofit DMY(133) 1227323 E/K CAL* CTP(57) 1226835 E/K FED DIG* DMX(163) 1227324 E/K CAL DIG* CTT(87) 1226836 E FED CONV* DMA(134) 1227325 E FED CONV DIG* DMB(164) 1227326

*These PROM's to be applied only to correct 52-60 MPH surge or chuggle. Use third GEN for regular service replacement.

PROM I.D. is ECM data parameter .1.3

1984 J EQUIPPED WITH 2.0L EFI L4 ENGINE ---------------------------------------- SERVICE ECM P/N 1226458 -----------------------

SERVICE LATEST PRODUCTION SERVICE PROM SERVICE PROM BROADCAST CODE BROADCAST CODE PART I.D. PART NUMBER -------------- -------------- --------- ----------- FIRST GEN: --------- FED AUTO BHW BHW 7348 16037347 FED AUTO OPT AXLE BHX BHX 7353 16037352 CAL AUTO BHZ BHZ 7380 16037379 FED MANUAL BHU DFX 1533 16040496 CAL MANUAL BHN DHA 2099 16042098

#### SECOND GEN:

FED AUTO FBU FBU 4136 1227256 FED AUTO FBW FBW 4139 1227257 (OPT AXLE)

#### THIRD GEN:

FED AUTO** FBU FBU 4136 1227256 FED AUTO** FBW FBW 4139 1227257 (OPT. AXLE) FED MANUAL DFX DFX 1533 16040496 CAL MANUAL DHA DHA 2099 16042098

* Retrofit for cold startability only ** Retrofit for cold startability

PROM I.D.'s are on a sticker on top of the PROM

1985 D, E AND K EQUIPPED WITH 4.1L DFI V-8 ENGINE ------------------------------------------------- SERVICE ECM P/N 1226930 ----------------------- PRODUCTION SERVICE LATEST BROADCAST CODE BROADCAST CODE SERVICE PROM (PROM I.D.) (PROM I.D.) PART NUMBER FIRST GEN: ----------- ------------ ------------ --------- D FED DJZ(19) HYA(102) 16056001 D CAL DKA(28) DKA(28) 16043757 D EXPORT DMK(35) DMK (35) 16042036 D OPT AXLE DKB(126) HYH(127) 16056103 E/K FED DKD(130) DKD(137) 1227382 E/K CAL DKH(59) DKH(142) 1227389 E/K EXPORT DMP(65) DMP(65) 16042048 E/K & E CONV OPTAXLE DKK(157) DKK(159) 1227387 E FED CONV DKM(131) DKM(138) 1227384 E CAL CONV DKM(131) DKM(138) 1227384 E/K FED DIG DKF(160) DKF(167) 1227383 E/K CAL DIG DKJ(88) DKJ(171) 1227390 E/K EXPORT DIG DMR(95) DMR(95) 16042051 E/K & E CONV OPT AXLE DIG DKL(187) DKL(189) 1227388 E FED CONV DIG DKN(161) DKN(168) 1227385 E CAL CONV DIG DKN(161) DKN(168) 1227385

#### SECOND GEN:

D FED HYA(102) HYA(102)* 16056001 HYA(103)** 1227381 D CAL DKA(28) DKA(28)* 16043757 DKA(110)** 1227629 D EXPORT DMK(35) DMK(35) 16042036 D OPT OXLE HYH(127) HYH(127)* 16056103 HYH(128)** 1227386 E/K FED DKD(130) DKD(137) 1227382 E/K CAL DKH(59) DKH(142) 1227389 E/K EXPORT DMP(65) DMP(65) 16042048 E/K & E CONV OPTAXLE DKK(157) DKK(159) 1227387 E FED CONV DKM(131) DKM(138) 1227384 E CAL CONV DKM(131) DKM(138) 1227384 E/K FED DIG DKF(160) DKF(167) 1227383 E/K CAL DIG DKJ(88) DKJ(171) 1227390 E/K EXPORT DIG DMR(95) DMR(95) 16042051 E/K & E CONV OPT AXLE DIG DKL(187) DKK(189) 1227388 E FED CONV DIG DKN(161) DKN(168) 1227385 E CAL CONV DIG DKN(161) DKN(168) 1227385

#### 1985 FWD-C

SERVICE ECM P/N 1226462 -----------------------

PRODUCTION SERVICE LATEST BROADCAST CODE BROADCAST CODE SERVICE PROM (PROM I.D.) (PROM I.D.) PART NUMBER ----------- ----------- ------------ FIRST GEN: ---------- C FWD FED DJK(211) HMC(215) 16052276 C FWD CAL DJL(222) HMD(226) 16052282 C FWD EXPORT BMB(230) BMB(230) 16037553

#### SECOND GEN:

C FWD FED DJM(213) HMC(215) 16O52276 C FWD CAL DJN(223) HMD(226) 16052282

#### THIRD GEN:

C FWD FED DSM(214) HMC(215) 16O52276 C FWD CAL DSN(225) HMD(226) 16052282

#### FOURTH GEN:

C FWD FED HMC(215) HMC(215) 16O52276 C FWD CAL HMD(226) HMD(226) 16052282

FIFTH GEN Engine May Stop Running with Power Steering Load --------- During Park to Reverse Maneuvers

C FWD FED HMC(215) HMC (215)* 16052276 HMC (216)* * 1228112 C FWD CAL HMD(226) HMD (226)* 16052282 HMD (227)* * 1228113

* Regular Service Replacement Prom

** Retrofit (Revised) Service Prom for Condition Described in Bulletin

PROM I.D. is ECM data parameter .1.3

1985 J EQUIPPED WITH 2.0L EFI L4 ENGINE --------------------------------------- SERVICE ECM P/N 1226867 ----------------------- SERVICE LATEST PRODUCTION SERVICE PROM SERVICE PROM BROADCAST CODE BROADCAST CODE PART I.D. PART NUMBER --------------- -------------- --------- ------------

2.OL FIRST GEN: ---------- FED AUTO DLJ HTL 4811 16054810 CAL AUTO CRP HTM 4816 16054815 FED MANUAL CRJ HHD 6740 1228361 CAL MANUAL CRL HHH 6760 1228363

#### SECOND GEN:

FED AUTO HDU HTL 4811 16O54810 CAL AUTO HDW HTM 4816 16054815 FED MANUAL HHD HHD 6740 1228361 CAL MANUAL HHH HHH 6760 1228363

#### THIRD GEN:

FED AUTO HTL HTL 4811 16054810 CAL AUTO HTM HTM 4816 16054815

FOURTH GEN: IDLE STALL OR IDLE SURGE

FED MANUAL HHD HHD 6740 1228361 CAL MANUAL HHH HHH 6760 1228363

1985 J EQUIPPED WITH 2.8L MPFI V-6 ENGINE ----------------------------------------- SERVICE ECM P/N 1226870 2.8L ----------------------- FIRST GEN: ---------- FED AUTO CXM FPU 1360 1228114 CAL AUTO CXP FPX 1363 1228116 FED MANUAL CXS FPZ 2044 16052043 CAL MANUAL CXU FRB 2093 16052092

SECOND GEN: Surge or Chuggle at 32-40 mph in 3rd Gear ----------- FED AUTO FPU FPU 1360 1228114 CAL AUTO FPX FPX 1363 1228116

PROM I.D.'s are on a sticker on top of the PROM

1986 FWD-C EQUIPPED WITH 4.L DFI V-8 ENGINE ------------------------------------------- SERVICE ECM P/N 1227056 ----------------------- PRODUCTION SERVICE LATEST BROADCAST CODE BROADCAST CODE SERVICE PROM (PROM I.D.) (PROM I.D.) PART NUMBER FIRST GEN: ------------ ------------ ------------ ---------- C FWD FED HMU (253) AFS (255) 16059149 C FWD CAL FCS (261) AFM (262) 16059167 C FWD EXPORT FCW (341) FCW (341) 16053017 C FWD LIMO FCX (254) AFN (256) 16059163 C FWD TOURING FCU (257) FCU (257) 16053O13 COUPE (FED) C FWD TOURING HMW (263) HMW (263) 16053044 COUPE (CAL)

#### SECOND GEN:

C FWD FED AFS(255) AFS(255) 16059149 C FWD CAL AFM(262) AFM(262) 16059167 C FWD LIMO AFN(256) AFN(256) 16059163

THIRD GEN: Engine may Stop Running During Parking Maneuvers ---------- or During Coast Down at Low Speeds During Ambient Temperature above 85 DEG F

C FWD FED AFS(255) AFS (255)* 16059149 AFS (258)* * 1228129 C FWD CAL AFM(262) AFM (262)* 16059167 AFM (264)** 1228130 C FWD LIMO AFN(256) AFS (258) 1228129

1986 E/K EQUIPPED WITH 4.1L DFI V-8 ENGINE ------------------------------------------ SERVICE ECM P/N 1227056 ----------------------- FIRST GEN: ---------- E/K FED FDF(303) AFR(306) 1228588 E/K CAL FDC(321) AFP(324) 1228587 E/K EXPORT FDH(340) FDH(340) 16053062

SECOND GEN: Engine may Stop Running During Drive Coast Down ----------- at Low Speeds with Hot Ambient Temperatures

E/K FED AFR(304) AFR(306) 1228588 E/K CAL AFP(322) AFP(324) 1228587

THIRD GEN: Code E48 and Engine May Stop Running With Power Steering Load During Park to Reverse Maneuvers

E/K FED AFR(306) AFR(306) 1228588 E/K CAL AFP(324) AFP(324) 1228587

PROM I.D. is ECM data parameter .1.3

1986 D EQUIPPED WITH 5.0L CCC V-8 ENGINE ---------------------------------------- SERVICE ECM P/N 1227301 -----------------------

SERVICE LATEST PRODUCTION SERVICE PROM SERVICE PROM BROADCAST CODE BROADCAST CODE PROM I.D. PART NUMBER -------------- -------------- --------- ------------

#### FIRST GEN:

D FED FNU AAND 2798 16062797 D CAL FNW AANF 2802 16062801 D EXPORT ABN AAHD 1147 16061146

#### SECOND GEN:

D FED AAND AAND 2798 16062797 D CAL AANF AANF 2802 16062801 D EXPORT AAHD AAHD 1147 16061146

THIRD GEN: False Code 44 on Long Coast Down --------- D FED AAND AAND 2798* 16062797 AAND 1050** 1228486 D CAL AANF AANF 2802* 16O62801 AANF 1052** 1228487 D EXPORT AAHD AAHD 1147 16062801

* Regular Service Replacement Prom ** Retrofit (Revised) Service Prom for Condition Described in Bulletin

PROM I.D.'s are on a sticker on top of the PROM

1986 J-CAR 2.0L EQUIPPED WITH EFI L4 ENGINE ------------------------------------------- SERVICE ECM P/N 1227165 -----------------------

SERVICE LATEST PRODUCTION SERVICE PROM SERVICE PROM BROADCAST CODE BROADCAST CODE PART I.D. PART NUMBER -------------- -------------- --------- -----------

#### FIRST GEN:

FED AUTO HTC CTZ 0566 16060565 CAL AUTO HTD HTD 5293 16055292 FED MANUAL CRY CRY 6807 1228368 CAL MANUAL CSA CSA 6810 1228369

#### SECOND GEN:

FED AUTO CTZ CTZ 16060565

THIRD GEN: IDLE STALL OR IDLE SURGE ---------- FED MANUAL CRY CRY 6807 1228368 CAL MANUAL CSA CSA 6810 1228369

1986 J-CAR EQUIPPED WITH 2.8L V-6 ENGINE ----------------------------------------- SERVICE ECM P/N 1227302 ------------------------ FIRST GEN: ---------- FED AUTO HKS HKS 4614 16054613 CAL AUTO HKX HKX 5602 16055600 FED MANUAL 4-SPD HKT HKT 5335 16055333 CAL MANUAL 4-SPD HKY HKY 5343 16055342

SECOND GEN: Surge or Chuggle at 32-40 MPH ---------- FED AUTO HKS HKS 1370 1228118 CAL AUTO HKX HKX 1376 1228120

PROM I.D.'s are on a sticker on top of the PROM

1987 C,E,K EQUIPPED WITH 4.1L DFI V-8 ENGINE -------------------------------------------- SERVICE ECM P/N 1227056 -----------------------

PRODUCTION SERVICE PROM LATEST BROADCAST CODE BROADCAST CODE SERVICE PROM (PROM I.D.) (PROM I.D.) PART NUMBER ------------ ----------- ----------- FIRST GEN: ---------- C FED ABPZ(272) AFTS (274) 16075422 C FED TOURING CKA (271) CKA (271) 16062406 COUPE C CAL CJM (267) AFTT (268) 16075435 C CAL TOURING CKB (266) CKB (266) 16062413 COUPE C LIMO CKC (273) CKC (273) 160624L7 E/K FED ABPX(311) ABPX (311) 16066646 E/K CAL ABPY(327) ABPY (327) 16066654 E/K EXPORT FDH (340) FDH (340) 16053062

SECOND GEN: Hesitation on Acceleration ----------- C FED AFTS(274) AFTS(274) 16075422 C CAL AFTT(268) AFTT(268) 16075435

1987 D EQUIPPED WITH 5.0L CCC V-8 ENGINE ---------------------------------------- SERVICE ECM P/N 1227301 ----------------------- SERVICE LATEST PRODUCTION SERVICE PROM SERVICE PROM BROADCAST CODE BROADCAST CODE PART I.D. PART NUMBER -------------- -------------- --------- ------------

#### FIRST GEN:

D FED AAND AAND 2798 16062797 D CAL AANF AANF 2802 16062801 D EXPORT AAHD AAHD 1147 16061146

SECOND GEN: False Code 44 on Long Coast Down ----------- D FED AAND AAND 2798* 16062797 AAND 1050** 1228486 D CAL AANF AANF 2802* 16062801 AANF 1052** 1228487

* Regular Service Replacement Prom ** Retrofit (Revised) Service Prom for Condition Described in Bulletin

1987 V EQUIPPED WITH 4.1L PFI V-8 ENGINE ---------------------------------------- SERVICE ECM P/N 1227750 -----------------------

LATEST PROM ID/ SERVICE PROM TRANS ID BROADCAST CODE PART NUMBER -------- -------------- ----------- FIRST GEN: 7AAZ 543/AHWY 16077504

SECOND GEN: 7APZ 544/AKAA 16076500 OR 545/ADBC

#### Note: PROM ID must be matched to transmission I.D. they are not interchangeable. 1987 JB EQUIPPED WITH 2.8L PFI V-6 ---------------------------------- SERVICE ECM P/N 1227730 -----------------------

SERVICE LATEST PRODUCTION SERVICE PROM SERVICE PROM BROADCAST CODE BROADCAST CODE PART I.D. PART NUMBER -------------- -------------- ---------- ----------- FIRST GEN: ---------- JB FED AUTO ADDB ADRY 3193 16073192 JB FED MAN ADDH ADSC 3213 16073212 JB CAL AUTO ADDC ADRZ 3197 16073196 JB CAL MAN ADDJ ADSD 3217 16073216

SECOND GEN: False Code 43 ----------- JB FED AUTO ADRY ADRY 3193 16073192 JB FFD MAN ADSC ADSC 3213 16073212 JB CAL AUTO ADRZ ADRZ 3197 16073196 JB CAL MAN ADSD ADSD 3217 16073216

1988 C, E, K EQUIPPED WITH 4.5L DFI V-8 ENGINE ----------------------------------------------- SERVICE ECM P/N 1228322 -----------------------

PRODUCTION SERVICE PROM LATEST BROADCAST CODE BROADCAST CODE SERVICE PROM (PROM I.D.) (PROM I.D.) PART NUMBER ------------ ------------ ----------- FIRST GEN: ---------- C FED AKYA(701) AKYA (701) 16083299 C CAL ADBK(702) ADBK (702) 16077600 C LIMO ADBP(703) ADBP (703) 16077616 COM CHASSIS E/K FED AKYB(861) AKYB (861) 16083305 E/K CAL ADBF(862) ADBF (862) 16077592

1988 V EQUIPPED WITH 4.1L PFI V-8 ENGINE ---------------------------------------- SERVICE ECM P/N 1227750 ----------------------- FIRST GEN: --------- V ADBC(545) ADBC(545) 16076500

1988 D EQUIPPED WITH 5.0L CCC V-8 ENGINE ---------------------------------------- SERVICE ECM P/N 1227301 ------------------------

SERVICE LATEST PRODUCTION SERVICE PROM SERVICE PROM BROADCAST CODE BROADCAST CODE PROM I.D. PART NUMBER -------------- -------------- ---------- ------------ FIRST GEN: ---------- D FED ADAY ADAY 7524 16O77523 D CAL ADAZ ADAZ 7528 16077527 D EXPORT ADBA ADBA 7533 16077532

1988 JB EQUIPPED WITH 2.8L PFI V-6 ---------------------------------- SERVICE ECM P/N 1227730 ------------------------ SERVICE LATEST PRODUCTION SERVICE PROM SERVICE PROM BROADCAST CODE BROADCAST CODE PART I.D. PART NUMBER -------------- -------------- ---------- ----------- FIRST GEN: ---------- JB FED AUTO AKDN AKDN 2363 16082362 JB FED MAN AKDM AKDM 2358 16082357 JB CAL AUTO AKDK AKDK 2349 16082348 JB CAL MAN AKDP AKDP 2367 16082366

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.