Powertrain, generic · Ignition system or misfire

P03E5 A Camshaft Position Actuator Position Sensor C Circuit Bank 1

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

On some engines the intake cam phaser (camshaft position actuator A) has its own position sensors, which tell the engine module where the phaser actually is; sensor C is the third of them, bank 1 the side with cylinder 1. P03E5 is the general circuit code for this sensor: the module sees an open circuit or a signal outside its valid window on the supply, signal or ground line. No manufacturer document available to us uses this code. GM's 2.7-litre engine monitors comparable position sensors on its sliding camshaft under other codes (P2C05 ff), with an open circuit above 200 kΩ and a short below 0.5 Ω in 4 of 5 samples – only as a comparison. The phaser is then usually held in its base position. CARB requires electronic parts of variable valve timing systems to be monitored as comprehensive components.

Likely causes

Connector or harness to position sensor C open or corroded
Position sensor C faulty
5 V reference or ground disturbed (also by another sensor on the same circuit)
Engine module

Symptoms

  • Check engine light on
  • Cam phasing held in its base position, loss of power
  • Possibly rough idle or higher consumption

Repair estimate

DifficultyMediumDIY possible
Parts and labour€80–450
Time0.5–2.5 h

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

Parts involved

cam phaser position sensor ccam phaser intake bank1sensor wiringengine control module

Related codes

P03E6P03E7P03E8P03F6P2B3FP0010

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