P1352 - FAULT CODE - OBD2

P1352 BUICK, CADILLAC, CHEVROLET, GMC: IGNITION CONTROL MODULE OUTPUT HIGH/PULSE DETECTED WHEN GROUNDED CYLINDER 2

The ICM (Ignition Control Module) has its power supply, as well as some dedicated ground circuits that control the ignition timing when the engine starts. In turn, the PCM (Powertrain Control Module) takes control of the ignition timing right after the engine starts. To make this control function easier, the PCM relies on input data provided by the CKP Sensor (Crankshaft Position Sensor) and CMP Sensor (Camshaft Position Sensor) through ignition timing trigger signal circuits, the low-resolution engine signal, the low reference signal, and the camshaft position signal.

The Ignition Control Module monitors the CKP Sensor signals during the engine start to calculate the right cylinder torque. A sequence of events starts and makes possible the ignition coil charge or acceleration timing to create and deliver the ignition. If a short occurs on the positive side of the battery, which is related to the ignition circuit for cylinder number 2, the PCM will recognize it as a fault. So, it will not be able to control any aspect of the cylinder 2 ignitions efficiently, and the diagnostic code P1352 OBDII will be set.

• Check Engine light illuminated.
• Engine exhibits erratic operation.
• Irregularities at idle.
• Hard engine start.

Reasons to set the P1352 OBD2 fault code:

• The Ignition Control Module may be faulty.
• The ignition control circuit may be damaged.
• Possibly the CKP Sensor is damaged or shorted to the battery positive.