P1350 BUICK, CADILLAC, CHEVROLET, GMC: IGNITION CONTROL SYSTEM
POST UPDATED IN June, 2023
P1350 BUICK, CADILLAC, CHEVROLET, GMC: IGNITION CONTROL SYSTEM
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.
DTC P1350 OBDII is set by one of the factors listed below:
To troubleshoot the P1350 OBD2 fault code you must do the following: