Definition of the code P0008
The P0008 code is related to the mechanical timing of your motor.
It may also be accompanied by codes: P0009, P0010, P0011, P0012, P0013, P0014, P0015, P0016, P0017, P0018, P0019 and many others.
What does P0008 mean
P0008 is a generic OBD-II code that indicates a problem with the engine control module (ECM) detecting changes in mechanical regulation between the crankshaft and crankshaft bank 1.
The ECM uses sensors to detect the position of the crankshaft and camshaft(s). Based on signals from these sensors, the ECM controls ignition and fuel timing at various speeds and loads. The code will cause the Check Engine light to come on and possibly reduce engine performance.
What is the cause of the P0008 code?
The Engine Position System Performance Bank 1 code can have several causes:
- Engine timing not synchronized
- Worn valve train components (chains, sprockets, guides)
- Crankshaft or camshaft sensor failures
- Cable damage
- Outdated ECM software
- Internal ECM failure
What are the symptoms of code P0008?
The P0008 code will cause the Check Engine light on the instrument panel / dashboard to illuminate. This is likely to affect:
- Engine idle quality
- Fuel Efficiency
- Overall engine efficiency
How does a mechanic diagnose a P0008 code?
P0008 is correctly diagnosed using an advanced scan tool capable of reading sensors and factory codes (not just one from your local auto parts store) to begin with. A qualified technician can read the data from the scan tool to determine when and where the problem occurred or if it still exists. He or she can remove the code from the ECM and perform a test drive, monitoring the scan tool data to see if the fault returns or occurs intermittently.
If the fault is intermittent, then a visual inspection or wiring test may yield more results. Otherwise, the vehicle will have to be driven until the problem becomes more persistent.
If the fault recurs immediately, a scan tool and information from professional sources should allow the problem to be reduced. Otherwise, it will be necessary to use a digital voltage range to monitor the sensor signals. These signals will indicate what the ECM is seeing and if they are correct. Removing the front engine cover may be necessary to check the timing.
Based on the test results, possible code removal, and a road test while checking the data, further diagnostics may be required. Diagnostics will require a number of tools, such as:
- Advanced scan tool for reading ECM data values
- Digital Voltage Meter with Accessories
- Basic hand tools for accessing sensors and timing components
The most common errors when diagnosing the P0008 code
It is common for inexperienced mechanics to assume, based on this code, that the engine requires a new chain or timing belt. Without performing the diagnostic procedure, the vehicle owner can spend several hundred dollars, only to have the problem not be fixed.
The code can be solved with a simple computer learning or reprogramming procedure. I have seen vehicles come from other garages after spending hundreds of dollars only to have the problem fixed in less than an hour.
It is always recommended to have a proper diagnosis before replacing parts based on code alone.
How serious is the code P0008?
The P0008 fault code can cause your vehicle to have:
- Lower fuel consumption
- Unstable idle
- Power reduction
- Potential for future engine damage
- Inability to pass emission tests
A qualified technician can diagnose the problem with the appropriate tools and can verify these potential problems and the impact on other systems.
What fixes can repair a P0008 code?
The most common procedure for repairing a P0008 code is as follows:
- Turn on a professional scan tool to verify that the code exists.
- Perform research from professional sources for code-based tests and values.
- Check other fault codes that may be related to the problem and perhaps clear the fault codes to see what fault codes return.
- Analyze the ECM scan tool data associated with the code and test the vehicle on the road when analyzing the ECM scan tool data. Check to see if the P0008 code returns or if symptoms are present.
- Visually check all items listed above (noise, wiring, etc.).
- Further diagnose the problem using the special tools listed above, if the problem appears to be recurring.
- The sensor signals and wiring need to be analyzed using a digital voltage range to determine where the problem lies.
- If the signals and scan tool values are within specifications, then removal of the timing/front engine cover may be required.
- Check that the timing marks on the crankshaft and crankshaft gears match.
- Check condition of timing chain/belt and guides for signs of wear.
- Replace the defective component detected during the above tests.
Additional notes to consider for code P0008
Engine timing between the crankshaft and crankshaft(s) is critical to engine performance and smoothness. This code typically indicates that the timing is out of alignment, causing performance problems.
The code is most common on Chevrolet, Subaru and Suzuki vehicles, although I have seen it on other makes as well. On vehicles with higher mileage, I usually suspect stretching or wear of the timing chain on the timing chain guides, resulting in a slight timing change.
On lower mileage vehicles, I suspect a problem with the ECM software update or a weak signal from the crankshaft or crankshaft sensor giving incorrect signals.
In all of these scenarios, an experienced technician with the proper professional tools and resources will be able to determine the real culprit behind the P0008 code.
