What Does P0012 Mean?
The PCM has determined that the Bank 1 intake camshaft timing is more retarded than the commanded position. The VVT system is failing to advance the camshaft when requested, often most noticeable during acceleration or high-load conditions. This code is the opposite condition of P0011.
Common Causes
30%
Low engine oil level or degraded oil causing insufficient hydraulic pressure to the VVT phaser
30%
Stuck or failed intake VVT oil control valve in the retarded position on Bank 1
20%
Clogged oil passages or screen at the VVT solenoid preventing oil flow
15%
Worn VVT phaser with internal locking pin stuck in default retarded position
5%
Timing chain stretch causing delayed camshaft phasing
Diagnostic Steps
1
Verify engine oil level is at the full mark and oil condition is acceptable; change oil if overdue or incorrect viscosity
2
Monitor Bank 1 intake cam advance angle with live data — if stuck near 0 degrees when commanded to 15-25 degrees, the system is not advancing
3
Actuate the VVT solenoid via bidirectional control; measure duty cycle response and verify solenoid resistance is within spec (6.9-7.9 ohms)
4
Remove the Bank 1 intake VVT solenoid and inspect the mesh screen filter for debris; clean or replace as needed
5
Check for TSBs related to VVT phaser locking pin failure, which is common on many GM and Ford platforms
Estimated Repair Cost
$50 - $800
Parts + labor, varies by vehicle and location
The PCM has determined that the Bank 1 intake camshaft timing is more retarded than the commanded position. The VVT system is failing to advance the camshaft when requested, often most noticeable during acceleration or high-load conditions. This code is the opposite condition of P0011.
The most common cause of P0012 (Intake Camshaft Position Timing - Over-Retarded (Bank 1)) is: Low engine oil level or degraded oil causing insufficient hydraulic pressure to the VVT phaser
Typical repair costs for P0012 range from $50 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Drivability is reduced with potential loss of power during acceleration, rough idle, and increased fuel consumption. The vehicle can be driven but should be repaired promptly to avoid secondary catalytic converter damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0012 to identify the root cause.
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Quick Info
Category
Powertrain
System
Variable Valve Timing (VVT) System
Difficulty
Type
Generic (SAE)
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