P1350 BUICK, CADILLAC, CHEVROLET, GMC: IGNITION CONTROL SYSTEM
POST UPDATED IN June, 2023
P1350 Code failures by brands
Description of DTC code P1350
The ICM (Ignition Control Module) has separate power and ground circuits. Between the Ignition Control Module and the Powertrain Control Module is the IC (Ignition Control) timing signal circuit, the IC timing control, and the signal provided by the Camshaft Position Sensor.
The ICM continuously monitors the timing signal from the CKP Sensor once the engine is started. This signal is then sent through the CKP Sensor 2 signal circuit and is used to calculate the correct cylinder torque, as well as to initiate the coil firing sequence. 18X reference pulses are sent from the Crankshaft Position Sensor to the ICM in circuit 1, and these are used for fuel injection and ignition control.
When the P1350 OBD2 diagnostic code is set, it is because the PCM detected an erratic operation (usually an open circuit) in the Ignition Control Module.
Symptoms of fault code P1350
- Check Engine lamp illuminated.
- Problems during engine start.
Causes of OBD2 P1350
DTC P1350 OBDII is set by one of the factors listed below:
- ICM wires or connectors may have been damaged.
- The ignition Control Module circuit may be faulty resulting in a short circuit.
- The ICM could be defective.
Possible solutions of the DTC code P1350
To troubleshoot the P1350 OBD2 fault code you must do the following:
- Consult the Technical Service Bulletins.
- Using a scan tool you should verify if there are stored fault codes that refer to problems in the components of the ignition system. If you discover such codes, perform the diagnosis of these.
- Check the ICM wiring or circuit connections for damage. If you detect common deficiencies, make repairs.
- Take readings of the Ignition Control Module voltages and check that its control circuit is not open or shorted. If you find any of the above conditions, make the necessary corrections.
