Code
P0081
Generic
P — Powertrain
Intake Valve Control Solenoid Circuit Bank 2
Views:
UK: 11
EN: 14
RU: 7
AI status
Completed
Completed
100%
Causes
- Open or short in the solenoid wiring harness (Bank 2)
- Poor or missing power supply or ground to the solenoid connector
- Failed intake valve control solenoid (stuck, electrically open, or shorted)
- Connector corrosion, bent pins, or poor terminal contact
- Oil contamination or mechanical failure of the cam phaser/actuator
- Faulty PCM/ECM (less common)
Symptoms
- Malfunction Indicator Lamp (MIL/CEL) illuminated
- Rough idle or unstable idle
- Reduced engine power, hesitation or poor acceleration
- Degraded fuel economy
- Possible engine noise (valvetrain/cam phaser) or misfire-style symptoms
- Temporary limp-home mode or restricted performance depending on control strategy
What to check
- Retrieve freeze frame and stored data; note conditions when code set
- Visual inspection of wiring and connectors at the Bank 2 intake valve solenoid
- Inspect fuses and relays related to engine control and valve solenoid power
- Measure battery and charging system voltage (engine off and running)
- Back-probe solenoid connector to check for power and ground while cranking/running
- Measure solenoid coil resistance with connector disconnected
Signal parameters
- Typical coil resistance: roughly 5–35 ohms (varies by manufacturer) — compare to spec
- Supply voltage: ~11–14.5 V with engine running (key on engine off supply ~ battery voltage)
- Control type: PCM normally uses low-side switching with PWM to modulate solenoid
- PWM duty cycle: 0–100% depending on commanded cam phasing
- PWM frequency: typically tens to a few hundred Hz (check vehicle spec)
- Expected behavior: voltage present at power pin with key on; control pin will show pulsed/variable signal when commanded
Diagnostic algorithm
- Read codes and freeze-frame data. Note engine speed, oil temp, voltage when fault occurred.
- Perform a careful visual inspection: damaged harness, chafing, melted insulation, oil-soaked connectors or bent pins at Bank 2 solenoid.
- Verify battery voltage and charging system; low system voltage can cause false faults.
- With ign on (engine off) probe the solenoid connector: verify constant power at the power terminal and good ground reference. If no power — trace fuse/relay and wiring.
- With connector disconnected, measure solenoid coil resistance. Compare to service specification. Open or near-zero (short) indicates failed solenoid.
- Reconnect and back-probe while cranking/running. Observe control pin for PWM signal and that voltage changes when PCM commands cam actuation. Wiggle harness to check intermittent faults.
Likely causes
- Damaged wiring or broken/loose connector at the solenoid
- Failed solenoid coil (electrical failure)
- Low battery/weak charging system causing abnormal voltage
- Oil sludge or debris preventing solenoid/plunger movement
Fault status
Status
Intake valve control solenoid circuit (Bank 2) exhibits electrical abnormality (open, short, low/high voltage, or no PWM control). Cam phasing for Bank 2 may be disabled or limited; service required to restore proper cam timing control.
Repair difficulty: Medium
Diagnostic time: 0.8-2.5 hours
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Code
P0081
LAND ROVER
P — Powertrain
Intake Valve Control Circuit (Bank 2)
Views:
UK: 2
EN: 5
RU: 0
AI status
Completed
Completed
100%
Causes
- Open or short in the solenoid wiring harness (Bank 2)
- Poor or missing power supply or ground to the solenoid connector
- Failed intake valve control solenoid (stuck, electrically open, or shorted)
- Connector corrosion, bent pins, or poor terminal contact
- Oil contamination or mechanical failure of the cam phaser/actuator
- Faulty PCM/ECM (less common)
Symptoms
- Malfunction Indicator Lamp (MIL/CEL) illuminated
- Rough idle or unstable idle
- Reduced engine power, hesitation or poor acceleration
- Degraded fuel economy
- Possible engine noise (valvetrain/cam phaser) or misfire-style symptoms
- Temporary limp-home mode or restricted performance depending on control strategy
What to check
- Retrieve freeze frame and stored data; note conditions when code set
- Visual inspection of wiring and connectors at the Bank 2 intake valve solenoid
- Inspect fuses and relays related to engine control and valve solenoid power
- Measure battery and charging system voltage (engine off and running)
- Back-probe solenoid connector to check for power and ground while cranking/running
- Measure solenoid coil resistance with connector disconnected
Signal parameters
- Typical coil resistance: roughly 5–35 ohms (varies by manufacturer) — compare to spec
- Supply voltage: ~11–14.5 V with engine running (key on engine off supply ~ battery voltage)
- Control type: PCM normally uses low-side switching with PWM to modulate solenoid
- PWM duty cycle: 0–100% depending on commanded cam phasing
- PWM frequency: typically tens to a few hundred Hz (check vehicle spec)
- Expected behavior: voltage present at power pin with key on; control pin will show pulsed/variable signal when commanded
Diagnostic algorithm
- Read codes and freeze-frame data. Note engine speed, oil temp, voltage when fault occurred.
- Perform a careful visual inspection: damaged harness, chafing, melted insulation, oil-soaked connectors or bent pins at Bank 2 solenoid.
- Verify battery voltage and charging system; low system voltage can cause false faults.
- With ign on (engine off) probe the solenoid connector: verify constant power at the power terminal and good ground reference. If no power — trace fuse/relay and wiring.
- With connector disconnected, measure solenoid coil resistance. Compare to service specification. Open or near-zero (short) indicates failed solenoid.
- Reconnect and back-probe while cranking/running. Observe control pin for PWM signal and that voltage changes when PCM commands cam actuation. Wiggle harness to check intermittent faults.
Likely causes
- Damaged wiring or broken/loose connector at the solenoid
- Failed solenoid coil (electrical failure)
- Low battery/weak charging system causing abnormal voltage
- Oil sludge or debris preventing solenoid/plunger movement
Fault status
Status
Intake valve control solenoid circuit (Bank 2) exhibits electrical abnormality (open, short, low/high voltage, or no PWM control). Cam phasing for Bank 2 may be disabled or limited; service required to restore proper cam timing control.
Repair difficulty: Medium
Diagnostic time: 0.8-2.5 hours
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Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
Your experience will help others
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