Powertrain, generic · Ignition system or misfire

P03E7 A Camshaft Position Actuator Position Sensor C Circuit Low 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. P03E7 means the sensor signal stays below its lower limit – signal or reference wire shorted to ground, supply open, or the sensor shorted internally; if the 5 V reference is the cause, other sensors on the same circuit often set codes too. 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.

Likely causes

Signal wire shorted to ground (chafed harness)
5 V supply open or shorted
Sensor faulty internally
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€60–400
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

P03E5P03E6P03E8P03F8P2B41P0642

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