Error Code P1351 is defined as Variable Valve Timing Sensor Range/Performance Problem Bank 2.

This error code is a manufacturer-specific trouble code, meaning it does not apply to all vehicles makes. Rather, it applies only to specific vehicle makes, such as Audi, GM (Chevrolet/GMC), Isuzu, Lexus, Mazda, Toyota, and Volkswagen. Specification of the definition, troubleshooting, and repairs still vary from one make and model to another.


For Audi, this code means Camshaft position (CMP) sensor, Bank 1 – range/performance problem.

For Ford, this code means Ignition Diagnostic Monitor Circuit Conditions.

For GM General Motors, this code means ICM Circuit High Input Conditions.

For Isuzu, this code means Ignition control module (ICM) – signal voltage high.

For Toyota P1351 and Lexus P1351, this code means Variable valve timing sensor – RH bank – range/performance problem.

For Mazda P1351, this code means Engine control module (ECM) – loss of ignition diagnostic monitor.

For Volkswagen, this code means Bank 1 camshaft position (CMP) sensor, range/performance problem.

Common Symptoms

As with other error codes, this code activates the Check Engine light and registers the code to the vehicle’ memory system. Other than that, there are usually no drivability and performance issues for this code.

Possible Causes

Different makes and model, of course, will have a slightly different set of triggers that could cause this code. Some of the common causes among different manufacturers include:

  • Dirty or low engine oil level
  • Fault in oil control valve
  • Bad valve timing
  • Defective VVT (variable valve timing) assembly
  • Bad PCM (rare)

How to Check

As said earlier, this code is a manufacturer-specific code. Diagnosis and repairs vary from one make and model to another. You should refer to your vehicle’ manual for the specific details of this code.

How to Fix

Repairs of course, also depend on the make and model of the vehicle. Common repairs for this code are:

  • Replace or refill engine oil
  • Repair or replacement of valve timing
  • Repair or replacement of oil control valve
  • Repair or replacement of VVT controller assembly

Definition, diagnosis and repair process for this error code depends on the make and model. Thus, it is important to refer to the repair manual specific for the make, model, and year of the vehicle for further assistance.