P2C08

Code

Generic P — Powertrain

A Camshaft Profile Actuator Position Sensor A Circuit High Bank 1

Brand: Generic

Type: P — Powertrain

Views: UK: 23 EN: 29 RU: 23

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Page language: EN

Causes

Faulty camshaft profile actuator position sensor A (Bank 1)
Short circuit to battery voltage on sensor signal wire
Open or intermittent wiring, broken conductor, or connector pin pushed out
Corroded or loose connector terminals
Poor or missing sensor ground or reference (5V) supply
Internal failure or seizure of the camshaft profile actuator/solenoid

Symptoms

Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
Reduced engine power or limp-home mode (on some vehicles)
Rough idle, hesitation, or misfire related to cam timing
Poor fuel economy and increased emissions
Hard starting or abnormal cam timing events
Stored related camshaft/cam timing fault codes

What to check

Read and record freeze frame and all stored codes using a scan tool; check for related camshaft/actuator codes
Visually inspect sensor connector, harness for damage, rubbing, corrosion, or water entry
Backprobe the sensor connector and check for the 5V reference and a solid ground with key on
Measure the sensor signal voltage with key ON engine OFF and with engine running; compare to expected range
Check for battery voltage on the signal pin (indicates short to B+) and for open circuits
Wiggle harness and connectors while monitoring live data for intermittent behavior

Signal parameters

Sensor type: typically position potentiometer or hall-effect potentiometer (analog DC voltage output)
Reference voltage: ~5 V reference supply from PCM to sensor (verify vehicle spec)
Signal voltage: expected within sensor-specific range (commonly ~0.1–4.9 V depending on position); a 'high' fault generally means voltage at or near battery voltage or above expected maximum (e.g., >4.8 V)
Ground: good chassis/PCM ground required for correct readings
Behavior: steady DC analog voltage that varies with actuator position (no high-frequency pulses)

Diagnostic algorithm

Verify the code and capture live data/freeze frame. Note operating conditions when the fault set.
Inspect wiring and connector for Bank 1 cam actuator position sensor A for corrosion, bent pins, damage, or water.
With key ON (engine OFF), backprobe the connector: verify 5V reference present, good ground, and check signal pin voltage. Note if signal equals battery voltage (short to B+) or is stuck high.
Start engine and monitor sensor signal while commanding cam actuator (if bi-directional control available) or while varying engine speed; look for sensible changing voltage. Perform a wiggle test on harness/connectors while monitoring.
If signal shows battery voltage on signal pin, isolate wiring for short to B+ (disconnect sensor and re-check); if short persists, trace/repair wiring between sensor and PCM.
If reference or ground is missing or out of spec, trace and repair wiring to PCM, check fuses/relays and grounds.
If wiring and supplies are good but signal is still out of range, replace the camshaft profile actuator position sensor. Re-test and clear codes.
If problem remains after sensor replacement and wiring checks, test PCM input for proper operation or consult OEM resources/TSBs; consider PCM replacement only after all other causes eliminated.
After repair, clear codes and perform a road test/longer drive cycle to confirm fault does not return.

Likely causes

Short to battery on the sensor signal wire or internal short in sensor
Open or damaged wiring/poor connector contact causing erratic/high reading
Failed or degraded position sensor
Bad sensor ground or missing 5V reference
Actuator mechanical failure that drives the sensor out of range
PCM fault (least likely)

Fault status

⚠️ Status

Camshaft profile actuator position sensor A circuit HIGH (Bank 1) — signal voltage above expected range; check sensor, wiring for short to battery, reference/ground, and actuator.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.5 hours

Repair manuals