P0012
Camshaft Timing Over-Retarded (Bank 1)
The engine computer is seeing the camshaft timing on bank 1 stay too far behind where it should be. This usually happens from oil flow problems, a failing variable valve timing part, or worn timing components. It can cause rough running, poor power, and higher fuel use.
- SEV
- 3/5
- DRIVE
- CAUTION
- DIY
- $20–$250
- SHOP
- $150–$1,200
Quick answer
AI-CITATION READYWhat it means
Can you drive with it?
Most common causes
- Engine oil is low, dirty, or the wrong viscosity/specification
- Camshaft variable timing solenoid failure or sticking oil control valve
- Variable valve timing actuator failure
Typical repair cost
DIY usually runs $20–$250. Typical shop repair lands around $150–$1,200, depending on the root cause.
01 / Definition
P0012 means the powertrain control module has detected that the intake camshaft on bank 1 is over-retarded, meaning it is lagging behind the commanded timing. The code is commonly related to variable valve timing oil control issues, low or dirty oil, incorrect oil viscosity, a stuck actuator, or timing chain wear. In some cases, a mechanical timing problem or wiring fault can also cause this code.
02 / Drive status
With caution. Short trips may be possible, but performance and fuel economy can be worse. Do not keep driving if the engine runs rough, makes noise, or the warning light starts flashing.
03 / Symptoms
- Check engine light
- Rough idle
- Weak acceleration
- Poor fuel economy
- Hard starting
- Engine hesitation
- Possible rattling noise from timing area
- Failed emissions test
04 / Causes
| 1 | Engine oil is low, dirty, or the wrong viscosity/specification | high |
|---|---|---|
| 2 | Camshaft variable timing solenoid failure or sticking oil control valve | high |
| 3 | Variable valve timing actuator failure | medium |
| 4 | Worn or stretched timing chain | medium |
| 5 | Engine timing installed incorrectly after repair | medium |
| 6 | Oil passage restriction, sludge, or low oil pressure | medium |
| 7 | Wiring or connector problem to the VVT solenoid or cam sensor | low |
05 / Diagnostic sequence
- 01Check engine oil level, condition, and service history.
- 02Verify the oil type and viscosity match the manufacturer's specification.
- 03Inspect the oil for sludge, fuel dilution, or metal debris.
- 04Scan for related codes such as camshaft sensor, crankshaft sensor, or VVT codes.
- 05Inspect the VVT solenoid, connectors, wiring, and oil passages for damage or contamination.
- 06Test the VVT solenoid operation with a scan tool or manufacturer test procedure.
- 07Compare commanded cam timing to actual cam timing using live data.
- 08Check for timing chain stretch or mechanical timing alignment if the problem persists.
- 09If needed, inspect the cam phaser/actuator and verify engine mechanical timing.
06 / Repairs
| 1 | Top off or change engine oil with the correct manufacturer-approved oil and replace the filter | $20–$90 |
|---|---|---|
| 2 | Clean or replace the camshaft variable timing solenoid and related oil control parts | $50–$250 |
| 3 | Repair damaged wiring, connectors, or sensor issues | $20–$200 |
| 4 | Replace the variable valve timing actuator or cam phaser if stuck or worn | $250–$900 |
| 5 | Repair or replace a worn timing chain, guides, or related mechanical timing components | $600–$1,200 |
MFG / Manufacturer notes
These supplements add make-specific diagnostic framing. Pages without full matrix backing or lane approval stay guarded and canonicalize back here until they are explicitly approved for indexing.
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Audi P0012
Expansion-candidate noindex child page
07 / Related codes
08 / FAQ
What does P0012 mean on a car?
It means the intake camshaft timing on bank 1 is delayed more than the engine computer expects.
Can low oil cause P0012?
Yes. Low oil, dirty oil, or the wrong oil can keep the variable valve timing system from working correctly.
Will P0012 clear itself?
It may clear temporarily if the problem is intermittent, but it will usually return until the cause is fixed.
Is P0012 a serious code?
It is moderate in severity, but it should not be ignored because it can lead to poor performance and possible engine damage if mechanical timing is involved.
09 / Source and method
- DATA BASIS
- OBD-II REFERENCE + OBD2.HELP
- METHOD
- STATIC VALIDATION
- SAFETY
- INFORMATIONAL
This page combines OBD-II diagnostic reference data with OBD2.help generated diagnostic guidance for code meaning, likely causes, and repair direction.
Publishing uses deterministic schema and build validation, plus manual spot checks on representative pages before release.
Safety-critical diagnosis and repairs should be confirmed with a qualified mechanic, especially when the vehicle is misfiring, overheating, or losing power.