Code
P0027
LAND ROVER
P — Powertrain
Intake valve control solenoid - circuit range / performance (bank 1)
Views:
UK: 17
EN: 40
RU: 21
AI status
Completed
Completed
100%
Causes
- Faulty intake VVT/OCV solenoid (oil control valve) on bank 1
- Restricted or contaminated oil passages supplying the VVT system
- Low engine oil level or poor oil quality
- Open/shorted wiring, corroded connector, or poor ground to the solenoid
- Faulty ECM or drive circuit
- Stuck cam phaser or mechanical failure in VVT mechanism
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Reduced engine power or torque, hesitation under load
- Rough idle or intermittent misfire
- Decreased fuel economy
- Possible hard starting or extended crank time
- Engine in limp mode on some models
What to check
- Read stored codes and freeze frame data with a capable scan tool
- Check engine oil level, condition and service history; verify oil meets spec and is not over-extended
- Inspect wiring and connectors at the bank 1 intake VVT solenoid for damage, corrosion or looseness
- Monitor live data: commanded VVT duty/camshaft target vs actual camshaft angle/position
- Check for additional related DTCs (cam/crank position codes, oil pressure codes)
- Measure resistance of the VVT solenoid and compare to manufacturer spec
Signal parameters
- Solenoid coil resistance (Ω) — compare to spec; open or short indicates fault
- Commanded duty cycle (%) or on/off command from ECM
- Measured solenoid current (mA) if supported by tool
- Camshaft angle/position actual vs commanded (degrees) — look for limited range or no response when commanded
- Battery voltage (V) at connector while commanded — should be near battery voltage when supply present
- Engine oil pressure (kPa/psi) and oil temperature (°C) — low pressure or cold oil can affect VVT operation
Diagnostic algorithm
- Confirm P0027 is current or stored; clear codes and attempt to reproduce
- Check engine oil level and condition; top-up or replace oil if low/contaminated and clear code, then retest
- Visually inspect the intake VVT solenoid connector and wiring harness on bank 1 for pin damage, corrosion, chafing or repairs; repair as needed
- With a scan tool, monitor commanded VVT duty and actual camshaft angle while revving engine per manufacturer procedure — note if commanded changes do not produce cam angle change
- Measure solenoid coil resistance off the vehicle and compare to specs; if out of range, replace solenoid
- Back-probe the solenoid connector or use a fused jumper to verify 12 V supply and grounding/driving from the ECM while commanding the solenoid; repair wiring or connector faults
- If electrical supply and driver are correct but actuator does not respond, remove the solenoid and inspect for contamination or sticking; clean or replace as required
- If replacement solenoid does not restore operation, inspect oil feed passages to phaser for blockage and verify oil pump/pressure
- If mechanical binding of the cam phaser or timing chain/gear issues are suspected, perform cam timing and phaser inspection/repair per factory procedure
- If all mechanical and electrical checks pass and fault persists, evaluate ECM driver circuit and consider module testing or replacement as a last resort
Likely causes
- Contaminated/clogged VVT solenoid or oil passages
- Electrical fault at the solenoid connector (open, short to +B, or poor ground)
- Low oil level or severely degraded oil causing low oil pressure
- Failed VVT solenoid (stuck or internally shorted)
Fault status
Status
MIL ON — Intake valve control solenoid (bank 1) circuit range/performance fault detected when commanded actuator behavior did not match expected cam position or electrical parameters.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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