P0008
Engine Position System Performance (Bank 1)
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The P0008 code — Engine Position System Performance (Bank 1) — means your vehicle's Engine Control Module (ECM) has detected that the relationship between the crankshaft position and the Bank 1 camshaft position is outside the acceptable range. In plain terms, the timing between your engine's rotating assembly and its intake or exhaust valves on the primary cylinder bank is off. This can happen due to mechanical wear in the timing system or problems with the variable valve timing (VVT) components that modern engines use to optimize performance and fuel efficiency.
The most common culprits are a stretched timing chain, a faulty VVT phaser (also called a cam phaser or variable valve timing actuator), or low and dirty engine oil that starves the VVT system of the hydraulic pressure it needs to function correctly. Because this code directly involves engine timing, it should not be ignored for long. Driving with incorrect valve timing can lead to reduced performance, poor fuel economy, and in severe cases, further damage to timing components or the engine itself. A good first step is always checking and changing the engine oil, as this is free of charge compared to other repairs and sometimes resolves the issue if the VVT system was simply oil-starved.
Repair costs for P0008 vary widely depending on the root cause. A simple oil change or sensor replacement can cost under $100, while a full timing chain kit replacement — which is often necessary on high-mileage engines — can run $1,000 to $2,500 at a shop due to the labor-intensive nature of the work. Because proper diagnosis requires ruling out oil condition, sensor integrity, and VVT solenoid function before assuming the timing chain is at fault, having a professional perform a thorough inspection is strongly recommended before committing to expensive repairs. Related codes like P0016, P0017, or P0009 may appear alongside P0008 and can help narrow down the specific component at fault.
Severity
Symptoms
- •Check Engine Light illuminated
- •Engine runs rough or misfires
- •Noticeable loss of power or acceleration
- •Poor fuel economy
- •Engine hesitation or stumbling under load
- •Hard starting or extended cranking time
Likely Causes
A stretched timing chain is the most common cause of P0008, as it causes the camshaft position to fall out of sync with the crankshaft. This is especially common on high-mileage engines or those with infrequent oil changes.
The variable valve timing phaser on Bank 1 may be stuck or operating sluggishly due to sludge buildup or wear, causing incorrect camshaft timing relative to the crankshaft. Low oil pressure or dirty oil accelerates this failure.
A worn or failing camshaft position sensor on Bank 1 can send inaccurate timing signals to the ECM, triggering P0008. The sensor itself or its wiring harness may be damaged or corroded.
Insufficient oil level or heavily degraded oil reduces hydraulic pressure to the VVT system, preventing proper camshaft phaser operation and causing timing deviations. Sludge buildup can block oil passages to the timing components.
Worn or broken timing chain guides or a faulty tensioner can allow the chain to slacken unevenly, causing erratic camshaft-to-crankshaft timing correlations. This is often accompanied by a rattling noise on cold startup.
Estimated Cost
Professional Repair
Includes parts + labor
Common Fixes
- Perform an oil change with fresh oil and filter (first diagnostic step)
- Replace the camshaft phaser/VVT actuator on Bank 1
- Replace stretched or worn timing chain, guides, and tensioner as a kit
- Replace the camshaft position sensor on Bank 1
- Clean VVT oil control valve (solenoid) and oil passages