Engine Position System Performance (Bank 1)
The P0008 code means the vehicle's onboard diagnostic system has detected: Engine Position System Performance (Bank 1). This is a critical severity code.
- Keep driving?
- No -- stop driving
- DIY difficulty
- hard
- Estimated cost
- $800 - $2,500 (parts and labor)
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Common Symptoms
- Check Engine Light on
- Rattling noise from engine on startup
- Rough idle
- Reduced engine power
- Poor fuel economy
Probable Causes (Ranked by Likelihood)
- Stretched or worn timing chain Very High
- Failed timing chain tensioner High
- Worn timing chain guides Moderate
- Camshaft or crankshaft reluctor wheel damage Low
Step-by-Step Diagnostic Procedure
-
Use a scan tool to compare camshaft to crankshaft correlation values at idle; deviation beyond 2-3 degrees indicates timing error
-
Listen for chain rattle or slap noise at cold startup which indicates a stretched chain or weak tensioner
-
Inspect timing chain tensioner for proper oil pressure and mechanical function if accessible
-
Perform a relative compression test to check for valve timing issues affecting cylinder performance
Frequently Asked Questions
Is P0008 a serious code?
Yes. P0008 indicates that the relationship between crankshaft and camshaft positions is outside the expected range. This is typically caused by a stretched timing chain. If ignored, the chain can skip teeth or break, causing catastrophic engine damage.
How much does timing chain replacement cost?
Timing chain replacement typically costs $800 to $2,500 depending on the engine. V-configuration engines with multiple chains cost more because the front of the engine must be disassembled extensively.
Can I drive with a stretched timing chain?
Driving with a stretched timing chain is not recommended. If the chain jumps a tooth or breaks, pistons can contact valves in interference engines, causing thousands of dollars in additional damage.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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