P0012 on Mazda
Intake Camshaft Position Timing - Over-Retarded (Bank 1)
P0012 on Mazda vehicles indicates intake camshaft position timing - over-retarded (bank 1). Au7o has documented this code across 4 Mazda models — most commonly on CX-7, CX-9, Mazda6. This code means the intake camshaft timing on Bank 1 is more retarded than the computer commanded — the variable valve timing system isn't reaching its target position. The computer controls camshaft timing through an oil-fed actuator (cam phaser) and a control solenoid; when actual timing lags the desired setting, this code sets. It is commonly caused by oil flow problems (low, dirty, or wrong oil), a stuck solenoid, or a worn cam phaser. Symptoms can include rough idle, reduced power, poor fuel economy, and sometimes rattling on startup. Typical repair costs on Mazda range from $300 to $3,500, depending on the specific model and root cause.
Common Causes of P0012
- •Low, dirty, or incorrect-viscosity engine oil
- •Faulty or stuck intake camshaft (VVT) oil control solenoid
- •Worn or stuck camshaft phaser/actuator
- •Clogged solenoid screen or oil passages
- •Wiring or connector problems at the solenoid
- •Timing chain wear or stretch affecting cam timing
- •Faulty camshaft position sensor
P0012 on Mazda by Model
Mazda CX-7(1 issue)
- VVT Actuator Failure2007-2012
The Variable Valve Timing (VVT) actuator on the 2.3L turbo engine can fail due to oil contamination, internal seal wear, or solenoid malfunction. A failed VVT actuator causes rough idle, poor performance, and check engine lights with timing-related codes. The VVT system relies on clean oil pressure to function, so oil contamination from extended oil change intervals accelerates failure. This issue often accompanies or precedes the larger turbo engine failure problem.
Mazda CX-9(1 issue)
- Timing Chain Stretch on 3.7L V62007-2015
The Ford-derived 3.7L Duratec V6 in first-generation CX-9 suffers from timing chain stretch, typically between 80,000-120,000 miles. Chain guides and tensioners wear, causing timing to retard and triggering check engine codes. If not addressed, can lead to jumped timing and severe engine damage.
Mazda Mazda6(1 issue)
- Variable Valve Timing (VVT) Actuator Failure2009-2021
The exhaust-side VVT actuator (cam phaser) fails due to oil sludge and wear, causing timing codes and engine rattle. The actuator solenoid can also stick, leading to incorrect valve timing. Oil change neglect accelerates failure. Common on both MZR and early SkyActiv 2.5L engines.
Mazda Mazdaspeed3(1 issue)
- VVT Actuator Failure and Timing Chain Stretch2007-2013
The 2.3L DISI turbo engine's Variable Valve Timing (VVT) actuator has a known design weakness where an internal pin can come loose, causing the timing chain to slack. This leads to timing chain rattle, oil leaks, excessive exhaust smoke, and potentially catastrophic engine failure if the chain jumps timing. Mazda issued a Special Service Program (SSP) extending warranty coverage for VVT noise and timing chain issues on 2007-2010 models with the L3T engine. Mazda also released a revised VVT actuator design to address the failure.
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View P0012 across all makes →Frequently Asked Questions
What does P0012 mean on Mazda?▼
P0012 stands for "Intake Camshaft Position Timing - Over-Retarded (Bank 1)." This code means the intake camshaft timing on Bank 1 is more retarded than the computer commanded — the variable valve timing system isn't reaching its target position. The computer controls camshaft timing through an oil-fed actuator (cam phaser) and a control solenoid; when actual timing lags the desired setting, this code sets. It is commonly caused by oil flow problems (low, dirty, or wrong oil), a stuck solenoid, or a worn cam phaser. Symptoms can include rough idle, reduced power, poor fuel economy, and sometimes rattling on startup. On Mazda specifically, this code is documented across 4 models.
What causes P0012 on Mazda vehicles?▼
Common causes on Mazda: Low, dirty, or incorrect-viscosity engine oil, Faulty or stuck intake camshaft (VVT) oil control solenoid, Worn or stuck camshaft phaser/actuator, Clogged solenoid screen or oil passages, Wiring or connector problems at the solenoid. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0012 on a Mazda?▼
Repair costs on Mazda range from $300 to $3,500, depending on the specific model and root cause.
Which Mazda models have P0012 documented?▼
Au7o has documented P0012 on 4 Mazda models: CX-7, CX-9, Mazda6, Mazdaspeed3.