Engine

P001C — Camshaft Profile Control Circuit High, Bank 1

Severity: medium Drive with care, to a shop

What P001C means

The engine control module adjusts camshaft timing or lift through a solenoid or actuator in the variable valve timing system. P001C sets when the voltage in the bank 1 'A' control circuit is higher than expected. This usually points to an open or shorted wire, a failed solenoid, or in rare cases the control module.

Symptoms

  • Check Engine Light on
  • Sluggish acceleration or reduced power
  • Poor fuel economy
  • Rough idle or fluctuating RPM
  • Inconsistent throttle response

Possible causes

  1. Faulty camshaft profile control solenoid or VVT actuator
  2. Wiring problems: open, short to power, or corroded connector pins
  3. Low or poor-quality engine oil affecting VVT operation
  4. Faulty camshaft position sensor
  5. Rarely, a failed engine control module

How to diagnose

  1. Scan all codes and freeze frame data, clear the code and see if it returns
  2. Check oil level and condition, and confirm the correct viscosity is in use
  3. Inspect the wiring harness and solenoid connector for chafing, corrosion and oil contamination
  4. Measure solenoid coil resistance and compare with the manufacturer spec
  5. Check supply voltage and control signal at the connector, and test the circuit for a short to power
  6. Check the camshaft position sensor and compare its signal in scan tool data
  7. Command the solenoid with the scan tool's active test
  8. If wiring and solenoid are good, check the PCM and for software updates

Common fixes

  • Replace the camshaft profile control solenoid or VVT actuator
  • Repair or replace damaged wiring and connectors
  • Change the oil and filter with the specified grade
  • Replace the camshaft position sensor if faulty
  • Reprogram or replace the PCM as a last resort

Questions and answers

What does P001C mean?

It means high voltage in the bank 1 camshaft profile control 'A' circuit. The PCM sees a higher voltage than expected at the solenoid or timing actuator circuit.

Can I drive with P001C?

For a short time, yes, but the engine may run rough and lose power. Have it checked soon to avoid worse performance and wasted fuel.

Can bad oil cause P001C?

Oil problems can affect VVT operation, since the system is oil-driven. However, a high-voltage circuit fault is more often electrical, so check the wiring and solenoid too.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.