P0008
UniversalThe Crankshaft Position (CKP) and Camshaft Position (CMP) sensors detect the position of the crankshaft and camshafts. The engine control module (ECM) compares the signals from these sensors to monitor the relationship between the crankshaft and camshafts. P0008 indicates that the ECM has detected a mismatch in the correlation between the crankshaft and camshaft on Bank 1 that exceeds a calibrated limit.
High SeverityThe engine's computer has detected that the crankshaft and camshaft positions on Bank 1 are out of sync, which can disrupt engine timing. This mechanical failure often leads to reduced engine performance, poor fuel economy, and potentially severe engine damage if not addressed.
⚠️ Before You Begin (Safety First)
Always allow the engine to cool completely before working on it to prevent burns. Disconnect the battery before performing any electrical repairs or disassembling major engine components. Use appropriate personal protective equipment, including gloves and eye protection.
Common Symptoms
- Check Engine Light illuminated
- Reduced engine performance (loss of power, rough running)
- Poor fuel economy
- Engine rattling or whining noise (especially on startup)
- Difficulty starting
- Engine stalling
Common Causes
- Stretched timing chain(s) or worn timing chain guides
- Faulty camshaft position sensor(s)
- Faulty crankshaft position sensor
- Issues with the camshaft phasers/actuators (VVT system)
- Low or incorrect engine oil pressure affecting VVT operation
- Wiring issues to sensors or actuators
- Damaged reluctor rings/tone wheels
Frequently reported on: Chevrolet Traverse (2009-2017), GMC Acadia (2007-2017), Buick Enclave (2008-2017), Cadillac SRX (2010-2016), Saturn Outlook (2007-2010)
Diagnostic Steps
- Check engine oil level and condition; ensure it's at the proper level and clean.
- Inspect for any visible wiring damage to the crankshaft and camshaft position sensors.
- Clear the code and drive to see if it returns; this can rule out a transient issue.
- If comfortable, attempt to verify camshaft and crankshaft sensor readings using an advanced OBD-II scanner capable of live data.
- For more advanced diagnostics or repairs involving timing components, professional assistance is strongly recommended.
👨🔧 When to Call a Professional
Given the complexity and potential for severe engine damage, it is highly recommended to consult a certified professional mechanic immediately upon diagnosing a P0008 code. Ignoring this code can lead to catastrophic engine failure.
Commonly Asked Questions
What does P0008 specifically mean for my engine?
P0008 indicates that your engine's computer has detected a misalignment between the crankshaft and camshaft on Bank 1, meaning the engine's timing is off. This can severely affect performance.
Can I drive my car with a P0008 code?
It is not recommended to drive your car with a P0008 code, especially for extended periods. This issue can lead to significant engine damage, including bent valves or catastrophic engine failure, if the timing becomes too far off.
Is a P0008 code always a stretched timing chain?
While a stretched timing chain is a very common cause, P0008 can also be triggered by faulty camshaft or crankshaft position sensors, issues with the variable valve timing (VVT) system, low oil pressure, or even damaged wiring. Proper diagnosis is crucial.
How much does it cost to fix a P0008 code?
The cost can vary significantly depending on the root cause. If it's a stretched timing chain, repair can be very expensive (often $1,500-$3,000+) due to the labor involved in accessing and replacing the components. Sensor replacements are much less costly.
Does changing the oil help with P0008?
Ensuring proper oil level and using the correct viscosity oil is critical, especially for vehicles with variable valve timing (VVT) systems, as oil pressure affects their operation. While it might not fix a stretched chain, poor oil can contribute to VVT issues that could trigger P0008.