| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. | 
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. | 
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. | 
These DTC apply to internal 5 V reference voltage supply within the engine control module (ECM).
| • | The ignition is ON. | 
| • | The DTCs run continuously once the above condition is met. | 
The internal 5 V reference voltage is to low.
The internal 5 V reference voltage is to high.
DTC P0658 and P0659 are Type C DTCs.
DTC P0658 and P0659 are Type C DTCs.
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
| ⇒ | If DTC P0658 or P0659 is reset this ignition, replace the K20 Engine Control Module (ECM). | 
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for ECM replacement, setup, and programming