P0008 on Ford: How to Diagnose & Fix
Engine Position System Performance - Bank 1
1 Ford model · 1 documented issue · 1 critical · $800-$3,600 repair
P0008 on Ford by model: symptoms, diagnosis and fix
Second-gen 3.5L EcoBoost engines develop a loud rattle/knock from the front timing cover for 2-5 seconds on cold start (and sometimes at idle). The variable-cam-timing (VCT) phasers have a lock pin that fails to engage on startup, allowing the phaser to rattle against the cam sprocket. Over time the phasers and timing chain wear, which can throw cam/crank correlation codes and, if ignored, lead to further timing component damage. Ford acknowledged it in service bulletins and a Customer Satisfaction Program with an extended warranty.
Common Symptoms
- Loud rattle or knock from front of engine for 2-5 seconds on cold start
- Rattle/ticking at idle once warm in worse cases
- Rough idle or check-engine light with cam timing codes
- Noise worse after the engine sits 6+ hours
How to Fix
Ford issued a PCM reflash (program 21B10) to change startup oil-pressure behavior and reduce phaser rattle, and Customer Satisfaction Program 21N03 to replace the cam phasers if the noise persists. Out of program, replacement of all four phasers plus timing chains/guides is a ~10-hour job. Replace phasers and timing chain set; use full-synthetic oil and stick to oil-change intervals to preserve VCT oil pressure.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Timing chain, guide and tensioner kit (2 chains, guides, tensioner arms, tensioners)OEMHL3Z-6268-A (Ford timing chain)Cross-refCloyes 90954S, Cloyes 90954SX (no sprockets), Melling 31079S$150–$380
The phasers are only half the repair — by the time the cold-start rattle is audible the chains, guides and tensioners are worn and must go in with the new phasers, otherwise the noise returns. Note which kit variant you buy: the "SX" ver…
Sources for this issue (1)
P0008 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0008 mean on a Ford?
P0008 stands for "Engine Position System Performance - Bank 1." P0008 means the engine computer detected that Bank 1 of the engine is timed incorrectly relative to where it should be — specifically, the relationship between the crankshaft and camshaft positions on that bank is off. The 'Engine Position System' refers to the components (timing chain/belt, sprockets, tensioners, and the variable valve timing actuators) that keep the camshafts synchronized with the crankshaft. When the computer commands a timing position but the sensors report the bank is out of the expected range, it sets this code. It generally signals a mechanical timing problem on Bank 1 that can affect performance and, if severe, risk internal engine damage. On Ford it is documented across 1 model: F-150.
What are the most common causes of P0008?
The most common causes of P0008 are: Stretched or worn timing chain, Failed or worn timing chain guides or tensioner, Faulty camshaft position (VVT/VCT) actuator or solenoid, Low or dirty engine oil affecting timing actuator operation, Jumped or mistimed timing chain/belt after service, Faulty crankshaft or camshaft position sensor, Clogged oil control valve or oil passages. The specific cause varies by vehicle.
How much does it cost to fix P0008 on a Ford?
Published repair estimates on Ford range from $800 to $3,600 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0008 on a different make?
View P0008 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.