Technical Description of OBD-II Trouble Code
Performance Issue in Bank 2 Engine Positions System
What does that signify?
This diagnostic trouble code (DTC) is a generic powertrain code that is applicable to OBD-II equipped vehicles, including but not limited to Cadillac, GMC, etc.
Although it is a generic code, the specific repair steps may vary depending on the make and model of the vehicle.
This source provides a comprehensive description of the P0009 code:
The Engine Control Module (ECM) conducts tests to determine any misalignment between the camshafts and the crankshaft on one bank of the engine. The misalignment may occur at an idler sprocket on either bank or at the crankshaft. Once the ECM learns the position of both camshafts on one bank of the engine, it compares the learned values to a reference value. If both learned values for one bank of the engine exceed a calibrated threshold in the same direction, the ECM will set a DTC.
This code is more commonly found in Suzuki, GM, Cadillac, Buick, and Holden vehicles. In fact, there are service bulletins for certain GM vehicles that recommend replacing timing chains, including engines such as 3.6 LY7, 3.6 LLT, or 2.8 LP1. It is also possible to encounter this DTC in a vehicle that has other related DTCs such as P0008, P0016, P0017, P0018, and P0019. Bank 2 refers to the side of the engine that does not contain cylinder #1. It is likely that you will not only see this code, but also have a P0008 code set at the same time.
Symptoms
The symptoms of a P0009 DTC may include:
Potential Causes
The potential causes of a P0009 code may include:
Possible Solutions
If your vehicle is still covered by powertrain warranty, it is recommended to have the dealer perform the necessary repairs. Generally, diagnosing and fixing this DTC will involve inspecting the timing chains and tensioners for excessive wear or misalignment, as well as inspecting the crank reluctor wheel for proper positioning. Parts should be replaced as required. As mentioned earlier, there are known issues with some GM engines, so there may be updated or revised replacement parts available. For more specific troubleshooting steps based on your vehicle’s make and model, please refer to a factory service manual.
