Engine Positions System Performance Bank 1
Note: Engine bank 1 typically indicates the side of the engine which contains the number 1 cylinder.
A P0008 indicates that the PCM has detected a misalignment between the camshaft/s for engine bank 1 and the crankshaft.
Code Set Parameters
Variations in timing between the camshaft/s and the crankshaft that exceed 10-degrees of the reference value will initiate a stored PCM code.
Symptoms which accompany the service engine light include roughness when accelerating with reduced fuel economy and engine performance. A code will be stored in the PCM and a malfunction indicator lamp will be illuminated.
Typical causes are a faulty timing chain/belt, timing chain/belt idler, or timing chain/belt tensioner. Failure of any of these components can cause a misalignment between the camshaft/s and the crankshaft. Faulty camshaft and crankshaft sensors, electrical wiring, and electrical connectors are also a possibility but less likely. The most common occurrences of this code take place after a timing belt or chain replacement; when the engine has been improperly timed.
Camshaft and crankshaft position sensors and the PCM are frequently condemned in error when this code is presented. Double check timing alignment marks before replacing any electrical components, especially if a timing belt or chain replacement has recently been performed.
- Crankshaft and camshaft positions are monitored using electromagnetic sensors
- These sensors utilize relief holes in camshaft and crankshaft drive gears to provide signal interruption in the electromagnetic field
- Some manufacturers use multiple crankshaft sensors to feed separate data inputs to the PCM
- Typically, these data inputs provide mapping information for engine ignition and fuel injection timing
- Engines that are equipped with multiple camshafts generally use a camshaft sensor for each camshaft
- Other automakers use notches cut into shafts or nodules that are permanently attached to interrupt the electromagnetic field
- Often these notches or nodules are located near the rear or middle of the shaft, depending upon sensor placement
- One manufacturer even places the crankshaft sensor on top of the transmission bell-housing and reads crankshaft position from interrupter holes in the flex plate.
Begin your diagnosis by visually inspecting all wiring and connectors
- Look for shorted or burned wiring and replace circuitry and connectors as required
If the system wiring, connectors, and components appear to be in normal working order, connect the scanner to the diagnostic connector and record all stored trouble codes and freeze frame data
- This information can be extremely helpful in diagnosing intermittent conditions that may have contributed to this code being stored
- After the codes are cleared, operate the vehicle to see if the code returns
- If the code fails to immediately return, you may have an intermittent condition
- Intermittent conditions can prove to be quite a challenge to diagnose and in extreme cases may have to be allowed to worsen before a correct diagnosis can be made.
Inspect timing alignment marks, after the engine has been brought manually to top dead center, to ensure that they are properly aligned
- If they are aligned test the amount of slack that is present in the timing belt or timing chain
- Should all timing components prove to be in properly alignment and good working order, then test system electrical wiring and connector integrity
- Technicians report cracked electrical wiring insulation near the camshaft and crankshaft sensors