P1351 - FAULT CODE - OBD2

P1351 BUICK, CADILLAC, CHEVROLET, GMC, ISUZU: IGNITION CONTROL MODULE CIRCUIT VOLTAGE

P1351 BMW: CYLINDER 5 MISFIRE WITH FUEL CUT-OFF

P1351 FORD: DIAGNOSTIC POWER MONITOR  CIRCUIT INPUT FAILURE

P1351 LEXUS, TOYOTA: VARIABLE VALVE TIMING SENSOR RANGE/PERFORMANCE PROBLEM BANK 2

In a vehicle that has the Direct Ignition System (DIS) or Distributorless Ignition, the PCM (Powertrain Control Module) relies on the data provided by the CKP Sensor (Crankshaft Position Sensor) and the CMP Sensor (Camshaft Position Sensor) to calculate the most appropriate ignition timing, which results in a better speed and load strategy for the engine.

Once the PCM receives the ignition pulse, it is converted into a digital signal that is sent to the ICM (Ignition Control Module), which provides it to the primary winding of the corresponding ignition coil. In this place, the initial pulse is transformed into a much higher pulse for the secondary winding and the combustion process begins.

Although the diagnostic code P1351 OBDII is a manufacturer-specific code, it is most often defined as the Circuit Voltage of the Ignition Control Module. The setting of this code occurs when the PCM detects an out-of-range voltage in the ICM control circuit. This electrical value can be either too high or too low.

• The Check Engine light is on.
• If the engine is hot, it may not start.
• The engine is suddenly turned off.
• Unstable operation of the engine at idle, once it reaches operating temperature.

The reasons for setting the fault code P1351 OBD2 are

• In the circuit of the BWI, there may be damage to the wiring or connectors, which in turn may cause a short or open circuit.
• The CKP Sensor or CMP Sensor may be damaged.
• Possibly the charging system has inconsistencies that cause abnormal voltages.

To solve the problems related to the DTC code P1351 OBDII, you must take into account the following:

• Check the source of the vehicle information for the Technical Service Bulletins (TSB).
• Carry out a thorough inspection of all wiring related to the circuit of the Ignition Control Module to check the good condition of the components themselves. Repair or change as required.
• Verify that the input voltage of the CKP Sensor or CMP Sensor matches the voltage specified by the manufacturer. If the reading obtained is not the indicated one, check the wiring between the sensor connector, the power switch, and the battery to verify that these are in good condition.
• Check that there is no short in the battery. If so, you should check all the associated cables and make the necessary repairs.