P0650
DTC P0650
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provide an overview of each diagnostic category.
DTC Descriptor
DTC P0650
- Malfunction Indicator Lamp (MIL) Control Circuit
Diagnostic Fault Information
Circuit/System Description
The malfunction indicator lamp (MIL) is located on the instrument panel cluster (IPC).
The MIL informs the driver that an emission system fault has occurred and that the engine control system requires service. The control module monitors the MIL control circuit for conditions that are incorrect for the commanded states of the MIL.
Conditions for Running the DTC
* The ignition is in the Run or Crank position.
* The remote vehicle start is not active.
* The ignition voltage is at least 11 V and no more than 32 V.
* DTC P0650 runs continuously when the ignition is ON.
Conditions for Setting the DTC
The control module detects that the commanded state of the MIL driver and the actual state of the control circuit do not match for greater than 5 s.
Action Taken When the DTC Sets
DTC P0650 is a Type B DTC.
Conditions for Clearing the MIL/DTC
DTC P0650 is a Type B DTC.
Reference Information
Schematic Reference
* Instrument Cluster Schematics Instrument Cluster Schematics
* Engine Controls Schematics (LZ1) [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Connector Views
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
1. Ignition OFF, open the hood to disable the Auto-Stop function. Refer to Hybrid Modes of Operation Description Hybrid Modes of Operation Description.
2. Ignition ON, verify the scan tool hood position parameter displays Open.
• If the hood position does not display Open, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle for DTC P254F.
3. Ignition ON, command the MIL ON and OFF with a scan tool. The MIL should turn ON and OFF.
4. Engine idling, command the MIL ON and OFF with a scan tool while observing the following control circuit status parameters:
* MIL Circuit Short to Gnd Test Status
* MIL Circuit Open Test Status
* MIL Circuit Short to Voltage Test Status
Each parameter should toggle between OK and Not Run or Not Run and OK.
5. 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
1. Ignition ON, verify that the instrument panel cluster (IPC) warning indicators are illuminated.
• If the IPC warning indicators are not illuminated, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, replace the IPC.
2. Ignition OFF, disconnect the harness connector X1 at the ECM.
3. Ignition ON, verify the MIL is not illuminated.
• If the MIL is illuminated, test the MIL control circuit for a short to ground. If the circuit tests normal, replace the IPC.
4. Connect a 3 A fused jumper wire between the MIL control circuit, terminal 12-X1, and ground. The MIL should illuminate.
• If the MIL does not illuminate, test the MIL control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the IPC.
5. If all circuits test normal, replace the ECM.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Instrument Cluster Replacement (Except Cadillac) Service and RepairInstrument Cluster Replacement (Cadillac) Service and Repair
* Control Module References Control Module References for ECM replacement, setup, and programming