P03E8A Camshaft Position Actuator Position Sensor C Circuit High Bank 1
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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. P03E8 means the sensor signal stays above its upper limit – typically an open sensor ground, a signal wire shorted to 5 V or battery voltage, or a faulty sensor. 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, with a loss of power.
- What you may notice
- Check engine light on
- Cam phasing held in its base position, loss of power
- Possibly rough idle or higher consumption
- Likely causes
- LikelySensor ground open or connector corroded
- PossibleSignal wire shorted to 5 V or vehicle voltage
- PossibleSensor faulty
- RareEngine module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €60 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.