Engine

P001A — Camshaft Profile Control Circuit Open (Bank 1)

Severity: medium Drive with care, to a shop

What P001A means

P001A means the engine control module detected an open circuit in the camshaft profile control circuit on Bank 1. This circuit drives a solenoid that directs oil to the variable valve timing or lift actuator, changing cam timing or profile. When the module sees no proper electrical response, it sets the code and limits or disables the system.

Symptoms

  • Check Engine light on
  • Reduced power and sluggish acceleration
  • Worse fuel economy
  • Rough or uneven idle
  • Inconsistent throttle response

Possible causes

  1. Open or broken wiring or a bad connector in the camshaft profile control circuit
  2. Faulty camshaft profile control (VVT) solenoid
  3. Low, dirty or incorrect engine oil
  4. Failed engine control module (unlikely)

How to diagnose

  1. Read all codes and freeze frame data, clear the code and see if it returns
  2. Check oil level and condition, and confirm the correct grade and specification
  3. Inspect the Bank 1 VVT solenoid wiring and connector for damage, corrosion or chafing
  4. Measure solenoid coil resistance and compare it with the service manual spec
  5. Test the wiring from the module to the solenoid for opens and shorts to ground
  6. Check for power and the control signal at the solenoid connector with the engine running
  7. If wiring and solenoid are good, test or replace the control module

Common fixes

  • Repair or replace damaged wiring and connectors
  • Replace the camshaft profile control (VVT) solenoid
  • Change the oil and filter using the correct oil
  • Replace or reprogram the ECM/PCM if confirmed faulty

Questions and answers

What does P001A mean?

It means an open circuit in the Bank 1 camshaft profile control circuit. The engine computer is not getting a normal electrical response from the VVT solenoid.

Can I drive with code P001A?

For a short time, such as to a shop, usually yes, but expect less power and worse fuel economy. Don't put off the repair, especially if the oil level or condition is questionable.

Where should I start diagnosing P001A?

Check the oil level and condition, then inspect the VVT solenoid connector and wiring. A poor connection, broken wire or failed solenoid is the most common cause.

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.