P1325 - FAULT CODE - OBD2

P1325 BUICK, CADILLAC, CHEVROLET, GMC, PONTIAC, SATURN: CRANKSHAFT POSITION (CKP) RELUCTOR WHEEL PERFORMANCE.

The CKP Sensor (Crankshaft Position Sensor) produces a voltage signal that lets us know the crankshaft position and speed. This AC voltage is different in amplitude and frequency. The latter factor depends on the crankshaft speed and the AC voltage output, crankshaft position, and battery voltage.

The Crankshaft Position Sensor has a reluctance wheel that attaches to the crankshaft. This wheel consists of 58 teeth and has a reference gap between each one. These teeth are spaced 6° apart with a 12° spacing for the reference gap. The reference gap pulse is known as the timing pulse, which is used to time the firing sequence of the coil with the crankshaft position. The rest of the teeth report the location of the cylinder during a revolution.

When the diagnostic code P1325 OBDII is set, it is because the ECM has detected 1 or 2 extra or missing teeth during a crankshaft revolution.

• Check Engine light ON.

Reasons for setting the P1325 OBD2 fault code:

• The system may have damage to its cables or connectors.
• Possibly there are deficiencies in the electrical connections.
• The Crankshaft Position Sensor could be faulty.

Steps to solve the P1325 OBDII DTC:

• Consult the TSBs.
• Try starting the engine, and check if DTC P1325 is set. If this is the case, manipulate the CKP Sensor electrical connections, and see if the engine stumbles or stalls. Repair any damaged wires or connectors.
• Check that the reluctance wheel and Crankshaft Position Sensor are not damaged. It is also necessary to check that the sensor is installed correctly and that there is no foreign material between the sensor and the wheel.
• Perform voltage checks on the CKP Sensor. Verify that the reference voltage is as indicated, and see there is no short to ground or open resistance. Fix if necessary.
• If after performing the above checks you do not detect damage to the circuitry, it is necessary to test the operation of the CKP Sensor. Replace it if you determine that the CKP Sensor is damaged.