Code
P0029
Generic
P — Powertrain
Exhaust Valve Control Solenoid Circuit Range/Performance Bank 2
Views:
UK: 24
EN: 27
RU: 32
AI status
Completed
Completed
100%
Causes
- Faulty exhaust VVT/solenoid actuator (bank 2)
- Damaged/open/shorted wiring or poor connector to the VVT solenoid
- Low engine oil level or dirty/contaminated oil (restricts solenoid flow)
- Clogged VVT solenoid screen or oil passages
- Faulty camshaft phaser (stuck, seized, or mechanically damaged)
- Faulty PCM/ECM or software anomaly
Symptoms
- Check Engine Light (MIL) illuminated (P0029 stored)
- Rough idle or unstable idle speed
- Reduced engine power or poor acceleration
- Decreased fuel economy
- Increased exhaust emissions or failed emissions test
- Unusual engine noise (ticking or knocking) if phaser is mechanically compromised
What to check
- Read and record freeze frame data and any accompanying codes (other VVT/cam/crank codes)
- Inspect engine oil level and condition; verify correct oil grade and viscosity
- Visually inspect wiring harness and connector at the bank 2 exhaust VVT solenoid for damage, corrosion, or loose pins
- Using a scan tool, monitor commanded VVT duty cycle/position vs actual camshaft position and camshaft timing offsets
- Measure VVT solenoid coil resistance with a multimeter and compare to spec
- Backprobe solenoid connector with scope or meter to verify PWM control voltage and ground while cranking/running
Signal parameters
- Control type: PCM-controlled PWM (pulse-width modulation) signal — duty cycle 0–100%
- Typical control voltage: ~0–12 V (vehicle battery reference) depending on circuit design
- Common PWM frequency range: tens to a few hundred Hz (vehicle-specific)
- Typical VVT solenoid coil resistance (generic): approximately 6–30 ohms (varies by manufacturer) — compare to OEM spec
- Expected camshaft position change when commanded: cam timing should move within a few degrees of commanded value (scan-tool live data)
Diagnostic algorithm
- Retrieve DTCs, freeze frame, and inspect for related codes (cam/crank/Oil pressure). Clear codes and attempt to reproduce.
- Check engine oil level, quality, and service history; top up or change oil if low/contaminated and retest.
- Visually inspect the wiring and connector at the bank 2 exhaust VVT solenoid for corrosion, loose terminals, or chafing; repair as needed.
- With ignition off, disconnect the VVT solenoid and measure coil resistance; compare to OEM spec. Replace solenoid if out of range.
- With connector connected, backprobe the control circuit while engine is running or cranking: verify presence of switched battery voltage and PCM-controlled PWM/ground. Use a lab scope for waveform verification.
- Apply direct battery voltage (bench test) carefully to the solenoid to confirm it actuates (observe movement/flow) — only if safe and per vehicle service info.
- If electrical signals are correct and solenoid functions, inspect cam phaser/timing chain for mechanical faults or timing offset using cam/crank correlation tests.
- If wiring and solenoid check good but issue persists, inspect fuses/relays and consider PCM reflash or replacement as a last step.
- After repair or component replacement, clear codes and perform road test while monitoring VVT command vs actual; confirm no reoccurrence.
Likely causes
- Failed or sticking exhaust VVT solenoid (most common)
- Wiring harness damage or poor connector/clips (corrosion, bent pins)
- Contaminated or low oil causing solenoid sticking
- Cam phaser mechanical failure
Fault status
Status
PCM detected exhaust valve control solenoid circuit performance outside expected range on bank 2. This indicates the VVT solenoid, its wiring/connectors, oil supply, cam phaser, or PCM control is not producing the expected cam timing response. Repair and verify before clearing the code.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
P0029
LAND ROVER
P — Powertrain
Exhaust valve control solenoid - circuit range/ performance (bank 2)
Views:
UK: 6
EN: 8
RU: 17
AI status
Completed
Completed
100%
Causes
- Faulty exhaust VVT/solenoid actuator (bank 2)
- Damaged/open/shorted wiring or poor connector to the VVT solenoid
- Low engine oil level or dirty/contaminated oil (restricts solenoid flow)
- Clogged VVT solenoid screen or oil passages
- Faulty camshaft phaser (stuck, seized, or mechanically damaged)
- Faulty PCM/ECM or software anomaly
Symptoms
- Check Engine Light (MIL) illuminated (P0029 stored)
- Rough idle or unstable idle speed
- Reduced engine power or poor acceleration
- Decreased fuel economy
- Increased exhaust emissions or failed emissions test
- Unusual engine noise (ticking or knocking) if phaser is mechanically compromised
What to check
- Read and record freeze frame data and any accompanying codes (other VVT/cam/crank codes)
- Inspect engine oil level and condition; verify correct oil grade and viscosity
- Visually inspect wiring harness and connector at the bank 2 exhaust VVT solenoid for damage, corrosion, or loose pins
- Using a scan tool, monitor commanded VVT duty cycle/position vs actual camshaft position and camshaft timing offsets
- Measure VVT solenoid coil resistance with a multimeter and compare to spec
- Backprobe solenoid connector with scope or meter to verify PWM control voltage and ground while cranking/running
Signal parameters
- Control type: PCM-controlled PWM (pulse-width modulation) signal — duty cycle 0–100%
- Typical control voltage: ~0–12 V (vehicle battery reference) depending on circuit design
- Common PWM frequency range: tens to a few hundred Hz (vehicle-specific)
- Typical VVT solenoid coil resistance (generic): approximately 6–30 ohms (varies by manufacturer) — compare to OEM spec
- Expected camshaft position change when commanded: cam timing should move within a few degrees of commanded value (scan-tool live data)
Diagnostic algorithm
- Retrieve DTCs, freeze frame, and inspect for related codes (cam/crank/Oil pressure). Clear codes and attempt to reproduce.
- Check engine oil level, quality, and service history; top up or change oil if low/contaminated and retest.
- Visually inspect the wiring and connector at the bank 2 exhaust VVT solenoid for corrosion, loose terminals, or chafing; repair as needed.
- With ignition off, disconnect the VVT solenoid and measure coil resistance; compare to OEM spec. Replace solenoid if out of range.
- With connector connected, backprobe the control circuit while engine is running or cranking: verify presence of switched battery voltage and PCM-controlled PWM/ground. Use a lab scope for waveform verification.
- Apply direct battery voltage (bench test) carefully to the solenoid to confirm it actuates (observe movement/flow) — only if safe and per vehicle service info.
- If electrical signals are correct and solenoid functions, inspect cam phaser/timing chain for mechanical faults or timing offset using cam/crank correlation tests.
- If wiring and solenoid check good but issue persists, inspect fuses/relays and consider PCM reflash or replacement as a last step.
- After repair or component replacement, clear codes and perform road test while monitoring VVT command vs actual; confirm no reoccurrence.
Likely causes
- Failed or sticking exhaust VVT solenoid (most common)
- Wiring harness damage or poor connector/clips (corrosion, bent pins)
- Contaminated or low oil causing solenoid sticking
- Cam phaser mechanical failure
Fault status
Status
PCM detected exhaust valve control solenoid circuit performance outside expected range on bank 2. This indicates the VVT solenoid, its wiring/connectors, oil supply, cam phaser, or PCM control is not producing the expected cam timing response. Repair and verify before clearing the code.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
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Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
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Was this AI description helpful?
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