Service Information

Volt

DTC P2618 or P2619

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 P2618: Crankshaft Position Signal Output Circuit Low Voltage

DTC P2619: Crankshaft Position Signal Output Circuit High Voltage

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Crankshaft Position Sensor Output Circuit	P2618	P0AC4, P0335	C0242, C0561, P0335, P0606, P0700, P0AB9, P0AC4, P0AF8, P148A, P148C, P1E00, P2619, U0100, U0121, U1839, U186A, U1876, U1879	-

The engine control module (ECM) outputs a signal through an output driver that replicates the crankshaft position signal. This output signal is used for the power inverter module. The ECM monitors the electrical integrity of the crankshaft position output signal to check for the signal being shorted to ground or shorted to power.

Conditions for Running the DTC

P2618

•	The ignition voltage is greater than 11.0 V.

•	The engine is not cranking.

•	The crankshaft position output is commanded high.

•	The DTC runs continuously when the above conditions are met.

P2619

•	The ignition voltage is greater than 11.0 V.

•	The engine is not cranking.

•	The crankshaft position output is commanded low.

•	The DTC runs continuously when the above conditions are met.

Conditions for Setting the DTC

The ECM detects that the commanded state of the driver and the actual state of the control circuit do not match for greater than 5 s.

Action Taken When the DTC Sets

DTCs P2618 and P2619 are Type B DTCs.

Conditions for Clearing the DTC

DTCs P2618 and P2619 are Type B DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

•	Electronic Ignition System Description

•	Hybrid Modes of Operation Description

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Engine running, observe the hybrid powertrain control module Engine Speed parameter with a scan tool. The reading should display an engine speed greater than 0 RPM.
Operate the vehicle within the conditions for running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.

Circuit/System Testing

Danger: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.

The High Voltage Disabling procedure will perform the following tasks:

•	Identify how to disable high voltage.

•	Identify how to test for the presence of high voltage.

•	Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.

Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:

•	Safety glasses with appropriate side shields when within 15 metres (50 feet) of the vehicle, either indoors or outdoors.

•	Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.

-	Visually and functionally inspect the gloves before use.

-	Wear the Insulation gloves with leather protectors at all times when working with the high voltage battery assembly, whether the system is energised or not.

Failure to follow the procedures exactly as written may result in serious injury or death.

Vehicle OFF, disable high voltage at the A4 hybrid/EV battery pack. Refer to High Voltage Disabling .
Connect the 12 V battery.
Vehicle OFF, disconnect the X2 harness connector at the T6 power inverter module.
Vehicle in Service Mode, test for 0.04 V between the signal circuit terminal X2-5 and ground.

⇒	If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.

⇒	If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM or hybrid powertrain control module setup, and programming