P0012
Fix within a few daysThe engine's computer detected that the intake camshaft on Bank 1 is not advancing or retarding its timing as commanded, specifically it's stuck too far in the 'retarded' position. This means the engine isn't getting the right valve timing for optimal performance and efficiency.
Code P0012 means the intake camshaft on Bank 1 is stuck too far retarded. Common causes: Low/dirty engine oil (40%), faulty VVT solenoid (40%), timing chain issues (15%). Drivability: Yes, for short trips only. Repair cost: $50-$200 DIY, $150-$600 professional.
Can I Drive With P0012?
Yes, for short trips only
Essential trips under 10 miles, avoid highways and heavy acceleration. Plan for immediate repair.
Stop driving immediately if: Flashing Check Engine Light, loud engine noises, significant power loss, engine stalling, burning smell.
Symptoms of P0012
- 1Rough idle
- 2Reduced engine power
- 3Decreased fuel economy
- 4Engine stalling
- 5Hard starting
Common Causes of P0012
Parts most likely causing this code, ranked by probability
The Variable Valve Timing (VVT) system relies on clean engine oil and proper oil pressure to adjust camshaft timing. Low or dirty oil prevents the VVT solenoid from functioning correctly.
40% of P0012 cases are fixed by addressing engine oil issues
The VVT solenoid, also known as an Oil Control Valve (OCV), directly controls oil flow to the camshaft phaser. If it's faulty, clogged, or stuck, it cannot adjust cam timing as commanded.
40% of P0012 cases are fixed by replacing the VVT solenoid
A stretched timing chain, worn tensioner, or a jumped timing chain can cause the actual camshaft timing to be out of sync with the crankshaft, leading to an over-retarded condition.
15% of P0012 cases are fixed by repairing timing chain components
A faulty camshaft position sensor can send incorrect signals to the engine computer, causing it to misinterpret the actual cam timing and trigger a P0012 code.
5% of P0012 cases are fixed by replacing the camshaft position sensor
Check These First (Before Buying Parts)
- Check your engine oil level and condition. Low or dirty oil is a primary cause of VVT issues. If it's low, add oil. If it's dirty, perform an oil change.
- Inspect the electrical connector and wiring for the Bank 1 intake VVT solenoid for any visible damage, corrosion, or loose connections.
How to Diagnose P0012
- 1Check engine oil level and condition. If low or dirty, perform an oil change.
- 2Inspect the wiring and electrical connector for the Bank 1 intake VVT solenoid for damage or corrosion.
- 3Test the resistance of the VVT solenoid. Compare it to specifications or swap it with the Bank 2 solenoid (if applicable) to see if the code moves.
- 4Inspect the wiring and electrical connector for the Bank 1 intake camshaft position sensor.
- 5If the above steps do not resolve the issue, a more in-depth inspection of the timing chain, tensioners, and camshaft phaser may be necessary.
P0012 on Popular Vehicles
Honda Accord
2003-2024Honda's VTEC/VVT systems are sensitive to oil quality and level. P0012 on an Accord often points to a clogged or faulty VTEC oil control valve (VVT solenoid) or neglected oil changes.
75% fixed by replacing the VVT solenoid or performing an oil change
Toyota Camry
2007-2024Toyota's VVT-i system can trigger P0012 due to a faulty VVT solenoid or sludge buildup from infrequent oil changes. The solenoid is typically accessible and a common failure point.
70% fixed by replacing the VVT solenoid or performing an oil change
Chevrolet Silverado
2007-2024On Silverado trucks, P0012 can be caused by a failing VVT solenoid. However, these engines are also known for timing chain stretch issues at higher mileages, which can also trigger this code and requires a more extensive repair.
60% fixed by replacing the VVT solenoid, 20% by timing chain repair
Frequently Asked Questions
What does P0012 mean?
P0012 indicates that the engine's computer has detected that the intake camshaft on Bank 1 is over-retarded, meaning its timing is not where it should be for optimal engine operation.
Can I drive with P0012?
Yes, for short trips only. You can drive your vehicle for essential, short trips, but prolonged driving can lead to reduced fuel economy, decreased engine performance, and potentially more severe engine damage if the underlying cause is a timing chain issue.
Will P0012 clear itself?
No, P0012 will not clear itself. The underlying mechanical or electrical issue causing the camshaft timing problem must be resolved before the code will clear. Even after repair, you will need to clear the code with a scan tool.
How do I fix P0012 myself?
Start by checking your engine oil level and condition; change it if it's low or dirty. If that doesn't fix it, locate and replace the Bank 1 intake VVT solenoid. These are the most common DIY fixes for P0012.
How much does it cost to fix P0012?
DIY repair costs for P0012 typically range from $50 to $200, primarily for an oil change or a new VVT solenoid. Professional repair costs usually fall between $150 and $600, depending on the shop and the specific part needed. If it's a timing chain issue, costs can be significantly higher.
P0012 keeps coming back - why?
If P0012 keeps returning, it often means the root cause was not fully addressed. This can happen if the VVT solenoid was replaced but the oil passages are still clogged, or if the actual problem is a stretched timing chain or a faulty camshaft phaser that was overlooked.
Will P0012 fail emissions/smog test?
Yes, P0012 will cause your vehicle to fail an emissions or smog test. The Check Engine Light being on indicates an active fault in the emissions control system, which is an automatic failure in states with such inspections.
What's the difference between P0012 and P0011?
P0012 indicates the intake camshaft on Bank 1 is 'over-retarded' (stuck too far back), while P0011 indicates it is 'over-advanced' (stuck too far forward). Both point to issues with the VVT system on Bank 1 intake, but describe different timing deviations.
P0012 on Honda Accord?
On Honda Accord models, P0012 is frequently caused by a faulty VTEC/VVT oil control valve (solenoid) or issues related to engine oil quality and level. Regular oil changes with the correct oil viscosity are crucial for preventing this code on Accords.
Questions to Ask Your Mechanic
Did you check the engine oil level and condition before diagnosing the VVT system?
Good answer: Yes, the first step was to confirm the oil was at the correct level and not excessively dirty. We also checked for any sludge buildup.
What were the live data readings for the Bank 1 intake camshaft position and commanded position?
Good answer: The actual cam position was consistently showing more retarded than the commanded position, confirming the P0012 condition. We also monitored oil pressure during VVT operation.
Repair Cost Estimate
DIY Repair
Parts only
$50-$200
Shop Repair
Parts + labor
$150-$600
Save $100-$400 by doing it yourself
Difficulty
intermediate
Time
0.5-3 hours
Beginner-friendly for oil changes and VVT solenoid replacement. Professional recommended if the issue points to timing chain components.
Cost of Waiting
Ignoring P0012 can lead to significantly reduced fuel economy and engine performance. If the cause is a stretched timing chain, continued driving can result in catastrophic engine damage, turning a potentially manageable repair into an engine replacement costing thousands of dollars.
While You're In There...
If you're addressing oil-related VVT issues, a fresh oil change is critical for proper system function and prevents repeat repairs.
On some engines, accessing the VVT solenoid requires removing the valve cover. Replacing the gasket at the same time prevents future oil leaks and saves labor.
Tools You'll Need
- OBD-II scan tool
- Basic hand tools (sockets, wrenches)
- Oil filter wrench (if changing oil)
- Torque wrench
- Oil drain pan
- Funnel
P0012 is a common VVT system code. Most repairs are straightforward, often involving an oil change or a solenoid replacement, and your engine will run much better afterward.
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Your Next Steps
Step 1: Check your engine oil. Ensure it's at the correct level and clean. If not, perform an oil change with the manufacturer-recommended viscosity.
Step 2: If the oil check doesn't resolve the code, locate the Bank 1 intake VVT solenoid. Inspect its electrical connector and wiring. If they look good, replace the VVT solenoid.
Step 3: After replacing the solenoid, clear the code with a scan tool and drive the vehicle to see if the code returns. If it does, a more advanced diagnosis, potentially involving timing chain inspection, is necessary.