This code indicates a problem with the timing between the crankshaft and the camshaft on that bank. The car's computer detects a significant difference between the crankshaft's rotation and the camshaft's rotation – they should be precisely synchronized.
Several things can cause this:
* Variable Valve Timing (VVT) Solenoid: This is the most common culprit. The VVT solenoid controls oil pressure to adjust camshaft timing. A faulty solenoid can't control the oil flow properly, leading to mistiming. This is often a relatively inexpensive and easy fix.
* VVT Actuator: The VVT actuator is the mechanical part that the solenoid controls. If it's seized, stuck, or worn out, it won't allow for proper camshaft adjustment. This is more expensive to replace than a solenoid.
* Camshaft Position Sensor (CMP Sensor): A malfunctioning CMP sensor provides inaccurate readings to the car's computer, causing the code.
* Crankshaft Position Sensor (CKP Sensor): Similarly, a bad CKP sensor will send incorrect information, resulting in the code.
* Timing Chain or Belt: Though less common, a stretched, broken, or improperly installed timing chain (or belt, depending on your HHR's engine) can cause this problem. This is a much more serious and expensive repair, often requiring significant engine disassembly.
* Low Oil Pressure: Insufficient oil pressure can prevent the VVT system from functioning correctly. Check your oil level and pressure.
How to Fix it:
1. Check the Easy Stuff First: Begin by checking your oil level and ensuring it's within the manufacturer's recommended range. Low oil pressure can cause this code.
2. Diagnostic Scan: Get a more thorough diagnostic scan from a professional mechanic or using a good OBD-II scanner that can read live data. This will help pinpoint the exact cause. Live data will show you the camshaft and crankshaft sensor readings and compare them. This will help differentiate between a sensor problem versus a mechanical problem.
3. Replace the VVT Solenoid (Most Likely Fix): This is often the first component to replace as it's relatively inexpensive and easy to access. You'll need to look up a repair guide specific to your HHR's year and engine.
4. Inspect the VVT Actuator: If replacing the solenoid doesn't fix the problem, inspect the VVT actuator for any signs of damage or sticking.
5. Check the CMP and CKP Sensors: Inspect these sensors for damage or corrosion. If they look suspect, replacement is necessary.
6. Timing Chain/Belt Inspection: This is the last resort and should only be considered if all other components have been ruled out. This requires significant mechanical expertise and usually needs to be performed by a professional mechanic.
Important Note: Do not attempt to replace the timing chain/belt yourself unless you have the experience and specialized tools. Incorrect installation can cause catastrophic engine damage.
Recommendation: While some mechanically inclined individuals might attempt some of these repairs themselves, it's generally recommended to take your HHR to a qualified mechanic, especially if you're not comfortable working on engines. They have the proper diagnostic tools and experience to determine the exact cause and perform the necessary repairs safely and effectively. Improper diagnosis and repair can lead to expensive consequences.
