DTC P0698 or P0699. Chevrolet Express

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2007 🢒 Express - AWD 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 DTC P0698 or P0699

Diagnostic Instructions

•	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.

DTC Descriptors

DTC P0698: 5-Volt Reference 3 Circuit Low Voltage

DTC P0699: 5-Volt Reference 3 Circuit High Voltage

Diagnostic Fault Information

Circuit	Short to Ground	High Resistance	Open	Short to Voltage	Signal Performance
APP Sensor 1 - 5-Volt Reference	P0107, P0698, P2122, P2564	P2138	P2122	P0106, P0699, P2123, P2227, P02565	--
MAP Sensor - 5-Volt Reference	P0107, P0698, P2564	P0101	P0107	P0106, P0401, P0699, P003A, P2565	--
TC Vane Position Sensor - 5-Volt Reference	P0107, P0698, P2564	P2563	P2564	P0106, P0401, P0699, P2565	--
EGR Valve - 5-Volt Reference	P0107, P0698, P2564	P046C	P0405	P0106, P0401, P0699, P2565	--

These 5-volt reference circuits are independent of each other outside the engine control module (ECM), but are bussed together inside the ECM. Therefore, a circuit condition on one sensor 5-volt reference circuit may affect the other sensor 5-volt reference circuits. The ECM monitors the voltage on the 5-volt reference circuit.

Conditions for Running the DTC

•	The ignition is ON.

•	Diagnostics run continuously.

Conditions for Setting the DTC

P0698

•	The ECM detects the 5-volt reference 3 circuit voltage is less than 4.7 volts.

•	The above condition is present for 2 seconds.

P0699

•	The ECM detects the 5-volt reference 3 circuit voltage is more than 5.2 volts.

•	The above condition is present for 2 seconds.

Action Taken When the DTC Sets

DTCs P0698 and P0699 are Type A DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0698 and P0699 are Type A DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

•	Engine Control Module Connector End Views

•	Engine Controls Connector End Views

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

Scan Tool Reference

•	Scan Tool Data List

•	Scan Tool Output Controls

•	Scan Tool Data Definitions

Circuit/System Verification

Engine starts and runs.

Circuit/System Testing

Important: Additional DTCs will set when disconnecting the components.

Ignition OFF, disconnect the harness connector of all appropriate sensors for the applicable DTC.

Important: A short to voltage on the signal circuit of certain components may cause this DTC to set.

Ignition ON, measure for 4.8-5.2 volts between one of the 5-volt reference circuits and ground.

⇒	If the voltage is less than the specified range, test for a short to ground on all the 5-volt reference circuits. If all circuits test normal, replace the ECM.

⇒	If the voltage is greater than the specified range, test for a short to voltage on all the 5-volt reference circuits. If all circuits test normal, replace the ECM.

Connect each component associated with the 5-volt reference circuit, one at a time, while monitoring the voltage. The voltage should not change more than 1 volt.

⇒	If the voltage display increases greater than the specified value when a component is connected, test the signal circuit for a short to voltage. If all circuits test normal, replace the ECM.

⇒	If the voltage display decreases more than the specified value when a component is connected, replace the component.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•	Accelerator Pedal Position Sensor Replacement

•	Exhaust Gas Recirculation Valve Replacement

•	Manifold Absolute Pressure Sensor Replacement

•	Turbocharger Vane Position Sensor Replacement

•	Control Module References for ECM replacement, setup, and programming