What Does Fault Code P0081 Mean?
The P0081 fault code applies to all vehicle manufacturers and means “Intake Valve Control Solenoid Circuit (Bank 2)“.
Background Information: The camshaft’s function is to control the opening and closing of the valves. In a variable valve timing (VVT) system, the electronic camshaft adjuster valve (or Oil Control Valve, OCV) adjusts the camshaft angle by changing the oil pressure to the camshaft adjuster (mechanical part) based on commands from the Engine Control Module (ECM), ensuring the valves open and close at the optimal time. This fault code sets if the circuit for the intake camshaft adjuster valve is outside the calibrated maximum range.
Symptoms of Fault Code P0081
The following are typical signs of the P0081 error:
- Unstable engine idle
- Increased fuel consumption
- Loss of power during acceleration
- Delayed engine start
- “Check Engine” light illuminated
- Jerking and stumbling during motion
Primary Causes of Fault Code P0081
- Faulty intake valve control solenoid (Bank 2)
- Clogged oil passage to the solenoid
- Wiring or connector issues (break, corrosion, short circuit)
- Faulty engine control module (PCM)
- Low or dirty engine oil
- Damaged phaser mechanism (VVT unit)
How to Diagnose P0081 Error Code?
- Read the error code with an OBD2 scanner.
- Check the wiring and connectors to the solenoid on Bank 2.
- Remove and inspect the solenoid itself for contamination and sticking.
- Measure the resistance of the solenoid coil (typically between 6 and 12 ohms).
- Assess the level and condition of the engine oil.
Possible Causes and Diagnostic Methods
Possible Cause | How to Check? |
|---|---|
Faulty Solenoid | Measure coil resistance with a multimeter. |
Clogged Oil Passage | Remove the solenoid, check oil flow/penetration. |
Damaged Wiring | Visual inspection, perform continuity test (ring out the circuit). |
PCM Failure | Perform computer/ECU diagnostics. |
Dirty Engine Oil | Check the dipstick; change oil and filter if necessary. |
Mechanical Fault (VVT/Phaser) | Inspect camshaft and VVT phaser mechanism. |
Required Tools: OBD2 scanner, multimeter, set of wrenches and screwdrivers, electrical contact cleaner, engine oil and filter (if needed).
How to Resolve Error Code P0081? (Problem Solutions)
Simple Fixes:
- Check and clean the contacts of the solenoid connector.
- Reset the error code and re-check.
- Change engine oil and oil filter.
- Reconnect or replace damaged wiring.
In-depth Diagnosis and Repair Plan:
- Replace the defective intake valve control solenoid (Bank 2).
- Flush the oil system in case of severe contamination.
- Check the operation of the camshaft phaser (VVT actuator).
- Reprogram or replace the PCM module (in extreme cases).
Solving Problems by Symptom
Symptom | Possible Solution |
|---|---|
Increased fuel consumption | Check solenoid; change oil. |
Loss of traction/power | Diagnose the VVT system. |
Check Engine Light + P0081 | Check power supply to the solenoid. |
Uneven idle | Inspect and clean the valvetrain components. |
Fault Code P0081 in Common Vehicles
- P0081 in BMW: On N62 and N63 engines, the error is often related to contaminated oil passages and VVT solenoid failure. Regular oil changes are crucial.
- P0081 in Audi: On 4.2 FSI and 3.0 TFSI engines, the fault code indicates a failing phasing solenoid. The error manifests as loss of dynamics and unstable idle.
- P0081 in Chevrolet: In models with V8 engines (e.g., Tahoe, Silverado), the intake bank solenoid often fails, especially if oil changes are not timely.
- P0081 in Dodge: On HEMI engines, P0081 can be caused by phaser wear or contamination of the VVT control valve. Often requires solenoid replacement and passage flushing.
- P0081 in Ford: On EcoBoost family engines, the error is due to low oil pressure in the phasing control system. Requires comprehensive diagnosis and pressure testing.
P0081 Frequently Asked Questions
What to do if you encounter error code P0081?
Error P0081 indicates a fault in the intake valve control system for cylinder bank 2. Most often, this is caused by a solenoid issue or oil contamination.
Can you drive with error code P0081?
Not recommended. The error can lead to reduced engine performance, compromised valve timing, and even potential valvetrain damage.
What most often causes the P0081 error?
The most common causes are a faulty intake valve control solenoid or contaminated oil passages, especially with infrequent oil changes.
Can I reset the P0081 error myself?
Yes, using an OBD2 scanner or by temporarily disconnecting the battery. However, the error will return if the cause persists.
Can the P0081 error be caused by low oil?
Yes, because insufficient oil pressure affects the operation of the phasing system, which can cause solenoid errors.
Do I need to replace the solenoid immediately once the error appears?
Not necessarily. First, you should perform diagnostics – it might only require cleaning contacts or changing the oil.
Related OBD2 Errors for P0081
- P0010 – Camshaft Position Actuator Circuit (Bank 1)
- P0011 – Camshaft Position – Timing Over-Advanced (Bank 1)
- P0021 – Camshaft Position – Timing Over-Advanced (Bank 2)
Important! The P0081 error can appear intermittently, especially during changes in engine load or rapid acceleration. Ignoring it can lead to more serious failures, including phaser wear and valvetrain damage. Do not delay diagnosis – regular oil changes and timely solenoid inspections can help avoid costly repairs. Use high-quality lubricants and do not ignore temporary appearances of the error.