P0008 on Mercedes-Benz: How to Diagnose & Fix
Engine Position System Performance - Bank 1
1 Mercedes-Benz model · 1 documented issue · 1 critical · $350-$1,800 repair
P0008 on Mercedes-Benz by model: symptoms, diagnosis and fix
The turbo petrol M270 (and naturally-aspirated M270/M274 in B180/B200/B250) uses a two-stage timing chain whose plastic guide rails and hydraulic tensioner degrade prematurely. Owners report a loud metallic rattle for roughly 1-15 seconds on cold start that fades as oil pressure builds. Short-trip urban use accelerates the problem because the cold-start period (low oil pressure) makes up a large share of running time. Stretch typically appears from ~80,000 km (50,000 mi), with some city cars rattling from ~70,000 km. Left unaddressed, chain stretch alters valve timing, throws fault codes, and risks contact/wear on cam bearings and phasers.
Common Symptoms
- Metallic rattle on cold start lasting 1-15 seconds
- Rattle fades once engine warms
- Rough running or misfire
- Reduced power
- Check engine light
How to Fix
Diagnose with a cold-start listen and read live chain/cam-position data via XENTRY. If only the tensioner is at fault, replacing the hydraulic chain tensioner first is the cheaper initial fix; if the chain is stretched, replace the complete OEM timing kit (chain, both guide rails, tensioner, and cam phaser sprockets if worn) to avoid consequential damage. Use the correct MB-Approval 229.5/229.51 0W-40 or 5W-40 oil and shorten oil-change intervals on short-trip cars.
Sources for this issue (3)
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 Mercedes-Benz?
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 Mercedes-Benz it is documented across 1 model: B-Class.
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 Mercedes-Benz?
Published repair estimates on Mercedes-Benz range from $350 to $1,800 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.