P0008 – Meaning, Causes, Symptoms, & Fixes

Code P0008 Definition

The Engine Control Module (ECM) has found a difference between the bank 1 camshaft position and crankshaft position

What Does P0008 Mean?

In order for the engine to run smoothly and efficiently, it has to know exactly where the camshaft and crankshaft are in its rotation. It does this by monitoring them using the Camshaft Position Sensor(s) and Crankshaft Position Sensor. If the Engine Control Module (ECM) detects that the bank 1 camshaft and crankshaft are not in the correct position, it will trigger code P0008.

What Are The Symptoms Of Code P0008?*

  • Check Engine Light
  • Rough running engine
  • Poor fuel economy
  • Decreased engine performance
  • Timing chain noise
  • Hard/extended start
  • No start

*No noticeable adverse conditions in some cases

What Is The Cause Of Code P0008?

  • Stretched timing chain
  • Jumped timing
  • Slipped reluctor ring on the crankshaft
  • Slipped reluctor ring on bank 1 camshaft
  • Faulty timing chain tensioner

How Serious Is Code P0008? – Severe

This trouble code can cause the vehicle to be hard to start and run rough. In some cases, the vehicle may not be driveable. It should be addressed as soon as possible. 

Code P0008 Common Diagnosis Mistakes

Not checking for TSBs Before starting diagnostics

Tools Needed to Diagnose:

  • FIXD
  • Basic Hand Tools
  • Vehicle Specific Service Manual
  • Oscilloscope

How To Diagnose And Repair Code P0008?

Difficulty of Diagnosis and Repair (5 out of 5)

  1. Check to see if there are any other codes along with P0008 and clear your Check Engine Light with FIXD.
  2. Check the freeze frame data in order to pinpoint the issue.
  3. Check for any Technical Service Bulletins (TSB) General Motor vehicles (GMC, Chevrolet, Buick, Suzuki, Cadillac, Holden) specifically have a known issue with stretched timing chains. If your vehicle applies to a TSB perform this first.
  4. This code requires an oscilloscope for proper diagnosis. Not all shops are equipped with this but many are. Using the O-scope (oscilloscope) you would connect to the signal wire for the crankshaft position sensor and bank 1 camshaft position sensor (also bank 2 if so equipped) and compare the 2 or 3 to each other. If they are offset from their proper locations a stretched timing chain, jumped timing, or a slipped reluctor ring is the issue. Replace the necessary parts to resolve the concern. Below is an image of what this test should look like on an O-scope screen. 

Estimated Cost of Repair

For error code P0008, one or more of the below repairs may be needed to solve the underlying issue. For each possible repair, the estimated cost of repair includes the cost of the relevant parts and the cost of labor required to make the repair. 

  • Timing chain $600-$1200
  • Reluctor ring $200-$600

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Comments 1

Cowart

April 30, 2020

Now to go through the process, Thanks.

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