P0012 on Chevrolet: How to Diagnose & Fix
Intake Camshaft Position Timing - Over-Retarded (Bank 1)
1 Chevrolet model · 1 documented issue · 1 critical · $1,500-$4,000 repair
P0012 on Chevrolet by model: symptoms, diagnosis and fix
The 2.4L Ecotec engine is prone to premature timing chain failure due to improperly hardened chains and faulty tensioners. A defective batch of timing chains that were not hardened properly causes the chains to stretch prematurely. When the timing chain fails or jumps teeth on the sprockets, it can cause catastrophic valve damage and complete engine failure.
Common Symptoms
- Check engine light with timing-related codes
- Engine rattle or rattling noise on startup
- Reduced engine power
- Engine misfires
- Complete engine stall or failure to start
- Metal debris in oil
How to Fix
Replace timing chain, tensioners, and guides. Inspect and replace damaged valves if timing jumped. Complete engine replacement if severe damage occurred. Check for GM Special Coverage letter for warranty extension.
Sources for this issue (2)
- GM Bulletin 13-06-01-003B - 2010-2013 Equinox 2.4L (LAF/LEA): verify timing chain kit, balance chain and tensioner replaced on 2010-2011 engines; inspect timing chain guidestsb
- GM Special Coverage 14159D - Excessive Engine Oil Consumption, 2010 Equinox 2.4L LAF (parts include timing chain, tensioner, balance chain guide)tsb
P0012 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0012 mean on a Chevrolet?
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 Chevrolet it is documented across 1 model: Equinox.
What are the most common causes of P0012?
The most common causes of P0012 are: 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. The specific cause varies by vehicle.
How much does it cost to fix P0012 on a Chevrolet?
Published repair estimates on Chevrolet range from $1,500 to $4,000 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.