P0012 Technical Description
Camshaft Position “A” – Timing Over-Retarded (Bank 1)
In this guide, we’ll cover what the P0012 trouble code means, its symptoms, causes, and how to fix it. You’re likely reading this because your car has thrown this code and you want a solution.
I’ve fixed this issue numerous times.
Specifically, you’ll learn what causes the P0012 code, common symptoms to watch for, and step-by-step fixes.
Alright, let’s get started.
Key Takeaways
- P0012 indicates camshaft timing is over-retarded on bank 1.
- Symptoms include check engine light, rough idling, and poor fuel economy.
- Causes include faulty VVT solenoid, low or dirty oil, and a stretched timing chain.
- Check oil levels and condition first.
- Inspect and replace faulty VVT solenoid, timing chain, or camshaft position sensor.
- Regular maintenance can prevent P0012 issues.
Table of ContentsShow
What Does P0012 Trouble Code Mean?

The P0012 trouble code indicates an issue with the timing of the camshaft in your engine.
Specifically, it means that the camshaft position “A” on bank 1 is over-retarded. In simple terms, the camshaft is not advancing as it should.
Your engine relies on precise timing between the camshaft and crankshaft to operate efficiently. The camshaft controls the opening and closing of the intake and exhaust valves.
When the timing is off, it can affect the engine’s performance, leading to poor fuel economy, reduced power, and even potential engine damage.
This code is often associated with the variable valve timing (VVT) system, which optimizes engine performance and fuel efficiency.
When the system detects that the camshaft timing is too far behind (over-retarded), it triggers the P0012 code.
Several components could be at fault. It might be a problem with the camshaft variable timing solenoid, also known as the VVT solenoid.
This part controls the oil flow to the camshaft phaser, which adjusts the timing. If the solenoid is stuck or malfunctioning, it can cause the timing to be off.
Another potential cause could be a timing chain that has stretched or jumped a tooth. This would also affect the camshaft’s ability to advance properly.
Low oil levels or dirty oil can also contribute to this issue since the VVT system relies on proper oil pressure to function.
Understanding what this code means is crucial for diagnosing and fixing the problem efficiently. Now, let’s move on to the symptoms you might notice if your car is experiencing this issue.
P0012 Trouble Code Symptoms
If your car has a P0012 trouble code, you might notice the following symptoms:
- Check Engine Light is on
- Rough idling or stalling
- Poor fuel economy
- Reduced engine power
- Difficulty starting the engine
- Unusual engine noises
P0012 Trouble Code Causes
Several issues can trigger a P0012 trouble code:
- Faulty VVT solenoid
- Stretched or damaged timing chain
- Low oil levels
- Dirty or contaminated oil
- Faulty camshaft position sensor
- Wiring issues or poor electrical connections
- Faulty camshaft phaser
How To Fix A P0012 Trouble Code

To fix a P0012 trouble code, follow these steps to diagnose and repair the issue:
1. Check the oil
Start by checking the oil level and condition. If the oil is low, top it up. If it’s dirty or contaminated, change the oil and filter.
2. Scan the code
Use an OBD-II scanner to confirm the P0012 code and check for any additional codes that might be related.
3. Inspect the VVT solenoid
Locate the variable valve timing solenoid and inspect it for any signs of damage or blockage. Clean the solenoid if it appears dirty. If it’s faulty, replace it.
4. Examine the timing chain
Inspect the timing chain for signs of wear or stretching. If the chain is damaged or has jumped a tooth, it will need to be replaced.
5. Check the camshaft position sensor
Inspect the camshaft position sensor for any signs of damage or wear. If the sensor is faulty, replace it.
6. Inspect wiring and connections
Check the wiring and electrical connections related to the camshaft and VVT system. Look for any loose or damaged wires and repair or replace them as necessary.
7. Test the camshaft phaser
If the previous steps do not resolve the issue, the camshaft phaser might be faulty. Test the phaser and replace it if necessary.
By following these steps, you can diagnose and fix the underlying issue causing the P0012 trouble code. If the problem persists, it may be best to seek professional assistance from a certified mechanic.
Conclusion
Now you know what the P0012 trouble code means and how you can fix it.
Have you encountered any other symptoms not listed here?
Drop a comment below and share your experience with fixing the P0012 code!