Engine

P03E9 — Camshaft Profile Actuator Position Sensor A Exceeded Learning Limit

Severity: medium Drive with care, to a shop

What P03E9 means

The engine control module uses position sensor A to monitor the actuator that changes camshaft profile or valve lift. During learning, the module stores the actuator's end positions. P03E9 sets when the reading goes beyond the allowed learning limits because of a sensor fault, wiring problem, or a worn or sticking actuator.

Symptoms

  • Check Engine light on
  • Reduced power or sluggish acceleration
  • Rough or noisy idle
  • Poor fuel economy
  • Possible reduced-power (limp) mode

Possible causes

  1. Faulty camshaft profile actuator position sensor A
  2. Damaged wiring harness or corroded or loose connector
  3. Worn or binding camshaft profile actuator or phaser
  4. Low or dirty engine oil, or clogged oil passages
  5. ECM software or learning fault

How to diagnose

  1. Scan all codes and freeze-frame data, and look for related cam timing codes.
  2. Check engine oil level and condition, and change it if needed.
  3. Inspect the sensor wiring and connector for damage, oil contamination, corrosion and poor pin fit.
  4. Test sensor power, ground and signal with a multimeter or scope per the factory wiring diagram.
  5. Compare commanded and actual actuator position in scan tool live data.
  6. Check the actuator and its control solenoid for sticking or incorrect operation.
  7. Clear the code, perform the relearn procedure, road test and confirm it does not return.

Common fixes

  • Replace camshaft profile actuator position sensor A
  • Repair the wiring or replace the damaged connector
  • Change oil and filter, and clean clogged oil passages
  • Repair or replace the camshaft profile actuator or phaser
  • Update ECM software and run the learning procedure

Questions and answers

What does P03E9 mean?

The engine computer found that the signal from camshaft profile actuator position sensor A went outside its learning limits. The cause may be the sensor, the wiring or the actuator mechanism.

Can I drive with P03E9?

Briefly and carefully, only until it can be diagnosed. You may get low power and rough running, and a mechanical fault can get worse over time.

How do I clear P03E9?

Clearing the code only helps temporarily if the cause remains. Find and fix the fault first, then clear the code and run a relearn if the vehicle requires it.

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.