Code
P0012
LAND ROVER
P — Powertrain
Intake camshaft position timing - delayed excessively (bank 1)
Views:
UK: 9
EN: 36
RU: 26
AI status
Completed
Completed
100%
Causes
- Low engine oil level or severely degraded/contaminated oil
- Clogged oil passages or screen restricting VVT oil supply
- Faulty/blocked oil control valve (VVT solenoid)
- Failed camshaft phaser/actuator (stuck or not moving)
- Stretched or jumped timing chain / incorrect valve timing
- Faulty intake camshaft position sensor or poor sensor signal
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Rough idle or misfire at idle/low rpm
- Reduced engine power and poor throttle response
- Reduced fuel economy
- Hesitation or stumbling on acceleration
- Possible unusual engine noise (rattle or knocking) if timing chain issues present
What to check
- Read freeze frame and all stored DTCs (check for related cam/crank or bank 1 codes)
- Check and record engine oil level, condition and service history
- Scan live data: commanded vs actual intake camshaft angle, VVT duty cycle/pulsewidth, oil pressure
- Check for technical service bulletins (TSBs) or software updates for this Land Rover model
- Visual inspection of wiring and connectors at cam sensor(s) and VVT solenoid(s)
- Measure resistance and bench‑test oil control valve operation
Signal parameters
- Intake camshaft actual angle (degrees) — bank 1
- Intake camshaft commanded/target angle (degrees) — bank 1
- Camshaft position sensor voltage or frequency (bank 1 intake)
- VVT oil control valve duty cycle or pulse width (ms)
- Engine oil pressure (kPa/psi) and oil temperature
- Crankshaft position correlation / cam/crank correlation PID
Diagnostic algorithm
- Retrieve DTCs and freeze frame data. Note related codes (cam/crank P00xx series) and when fault occurred.
- Check engine oil level and condition. If low or dirty, restore correct level and replace oil/filter, then clear codes and retest.
- Inspect wiring and connectors for the intake cam sensor and VVT solenoid (bank 1). Repair any damaged wiring or poor connections.
- With a scan tool, monitor commanded vs actual intake cam angle and VVT solenoid command while varying RPM and load. Confirm the PCM is commanding changes and whether the actuator follows.
- Test the oil control valve electrically (resistance and apply battery power briefly) and functionally (observe movement or change in cam angle with scanner). Replace if inoperative or sticking.
- Check oil passages and VVT actuator for sludge/build‑up; if suspected, remove and inspect phaser and OCV. Clean or replace components as required.
- If electrical and hydraulic components test good but actual cam angle remains incorrect, perform mechanical timing inspection: check cam/crank correlation and timing chain/belt condition for stretch or jump.
- If mechanical timing is correct and components are replaced but fault persists, review PCM software level and consider PCM diagnosis/reprogramming.
- After repairs, clear codes and perform a road test/extended idling while monitoring live data to confirm intake cam timing responds and code does not return.
Likely causes
- Dirty oil or low oil level causing inadequate VVT oil pressure
- Oil control valve (VVT solenoid) stuck or electrically failing
- Cam phaser stuck or internal phaser failure
- Timing chain/slack/jump resulting in mechanical timing error
- Intake camshaft position sensor fault or intermittent wiring
Fault status
Status
Intake camshaft position timing over‑retarded (bank 1) — actual cam angle more retarded than allowed compared to commanded position.
Repair difficulty: Medium
Diagnostic time: 1-4 hours
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