Powertrain, generic · Ignition system or misfire

P03EA A Camshaft Profile Actuator Position Sensor B Exceeded Learning Limit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Engines with cam profile switching move the intake camshaft between lift profiles with actuators – for example pins that shift a sliding cam – and position sensors report which profile is engaged. The engine module learns reference values of position sensor B, such as its end-position levels or the expected pulse position relative to the crankshaft and camshaft sensors; a Ford patent describes correcting this position for the cam phase. P03EA means the learned value lies outside the permitted adaptation limit, so profile detection is no longer reliable and the module usually stays in a safe profile. No manufacturer document available to us describes the code or its limits; GM's 2.7-litre sliding cam has no learning-limit code. CARB lists a pin that does not reach its position among the faults to be detected.

Likely causes

Position sensor B or actuator with integrated sensor worn or faulty (signal drift)
Actuator pin or sliding piece stiff, guide worn, dirty oil
Actuator not relearned or wrongly fitted after replacement
Connector or wiring with contact resistance
Engine module software (learning algorithm)

Symptoms

  • Check engine light on
  • Profile switching disabled: less power at high revs or higher consumption
  • Possibly further profile actuator or sensor codes

Repair estimate

DifficultyHardWorkshop job
Parts and labour€150–900
Time1–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

cam profile actuator position sensor bcamshaft profile actuatorsliding camshaftengine control module

Related codes

P2C09P2C0AP03E9P03EBP2B4F

References: law.cornell.edu, gsi.ext.gm.com, patents.google.com.