Code
P0029
LAND ROVER
P — Powertrain
Exhaust valve control solenoid - circuit range/ performance (bank 2)
Views:
UK: 9
EN: 16
RU: 35
AI status
Completed
Completed
100%
Causes
- Failed/exhaust VVT solenoid (bank 2)
- Open, shorted or damaged wiring in the solenoid control circuit
- Poor connector contact, corrosion or pin damage at solenoid or PCM connector
- Low engine oil level, dirty or degraded oil restricting VVT oil control passages
- Clogged oil control valve or oil feed passages to the cam phaser
- Sticking or mechanically failed cam phaser/actuator (internal binding)
Symptoms
- Check Engine Light illuminated (MIL) — P0029 stored
- Reduced engine power, poor throttle response or limp mode
- Rough idle or intermittent misfire when timing is wrong
- Degraded fuel economy and increased emissions
- Rattling or abnormal noise from front/rear of the engine at certain RPMs (phaser noise)
- Possible failed emissions test
What to check
- Read and record stored codes and freeze frame data with a scan tool
- Confirm VIN/cylinder bank orientation (identify bank 2)
- Check engine oil level and condition; verify recommended oil viscosity is fitted
- Visually inspect wiring and connector at the bank 2 exhaust solenoid for damage, corrosion, or poor fit
- Back-probe solenoid connector to check for battery voltage at supply pin and ground integrity
- Measure solenoid coil resistance with multimeter (compare to manufacturer spec)
Signal parameters
- Supply voltage to solenoid: ~11–14 V (key ON/running)
- Solenoid coil resistance: typically in the single- to low-double digit ohms (manufacturer specific — consult data)
- Control signal: PWM duty cycle 0–100% (frequency depends on vehicle — often 50–300 Hz)
- Expected relationship: when commanded duty changes, measured camshaft position should change accordingly (cam advance/retard degrees evident in cam position sensor data)
- Ground continuity near 0 Ω at chassis/PCM ground
Diagnostic algorithm
- Verify code and record freeze frame/live data; confirm code is current and bank identification is correct.
- Check engine oil level and condition; top up and replace oil/filter if very dirty or incorrect viscosity was used.
- Visually inspect solenoid connector and wiring for damage, corrosion, or poor pin contact; repair any wiring/connector issues.
- With ignition OFF, disconnect solenoid and measure coil resistance; compare to spec. Replace solenoid if out of range or open/shorted.
- With a lab scope or back-probing multimeter, verify supply voltage and ground at solenoid connector. Observe control (PWM) waveform while engine runs or cranks; verify waveform changes with commanded conditions.
- If wiring and electrical checks pass, remove and inspect/clean the oil control valve (OCV) and oil passages; replace the OCV/solenoid if contaminated or sticky.
- If replacing the solenoid/OCV does not clear the code, inspect the cam phaser/actuator for mechanical seizure or excessive play; replace the phaser if mechanically failed.
- If mechanical and electrical components are good, consider PCM reflash/update or replacement only after confirming all hardware is serviceable.
- Clear codes and perform a road test/drive cycle while monitoring commanded vs actual camshaft position to confirm repair.
Likely causes
- Failed or electrically faulty exhaust VVT/solenoid on bank 2
- Contaminated/old engine oil or clogged oil passages restricting actuator movement
- Damaged wiring or corroded connector at the solenoid
- Mechanical cam phaser sticking or seized
Fault status
Status
Exhaust valve control solenoid circuit (bank 2) is out of range or not performing as commanded — possible VVT solenoid, wiring, oil or cam phaser issue.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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