Technical Description of OBD-II Trouble Code
A Slow Response in Bank 1 Camshaft Position
What does that signify?
This generic powertrain diagnostic trouble code (DTC) is applicable to all OBD-II vehicles that have variable valve/cam timing. This includes vehicles from Subaru, Dodge, VW, Audi, Jeep, GMC, Chevrolet, Saturn, Chrysler, Ford, etc. Although it is a generic code, the specific repair steps may vary depending on the make and model of the vehicle.
Many modern vehicles use variable valve timing (VVT) to enhance engine performance and fuel economy. In a VVT system, the powertrain control module (PCM) controls solenoid-operated oil control valves. These valves apply oil pressure to an actuator located between the camshaft and timing chain sprocket. The actuator then adjusts the angular position, or phase change, of the camshaft. A camshaft position sensor is used to monitor the position of the camshaft.
A camshaft position slow response code is triggered when the actual camshaft position does not match the desired position set by the PCM during camshaft phase changes.
In terms of trouble code descriptions, the letter “A” indicates the intake, left, or front camshaft. On the other hand, the letter “B” indicates the exhaust, right, or rear camshaft. Bank 1 refers to the side of the engine that contains the #1 cylinder, while bank 2 refers to the opposite bank. If the engine has an inline or straight design, there is only one bank.
Code P000A is set when the PCM detects a slow response in the camshaft position phase change from bank 1 circuit “A”. This code is related to P000B, P000C, and P000D.
What is the severity of this DTC?
The severity of this code ranges from moderate to severe. It is advisable to address this code as soon as possible.
What are some of the symptoms of the code?
Symptoms of a P000A trouble code may include:
What are some possible causes of the code?
Possible causes for this code may include:
An example of a camshaft position (CMP) sensor:
What are some P000A troubleshooting steps?
Begin by checking the engine oil level and condition. If the oil is satisfactory, visually inspect the camshaft position sensor, oil control solenoid, and corresponding wiring. Look for loose connections, damaged wiring, etc. If any damage is found, repair it as necessary, clear the code, and observe if it returns. Next, check for any technical service bulletins (TSBs) related to the issue. If no relevant information is found, proceed with step-by-step diagnosis of the system.
The following is a general procedure, as testing for this code varies between vehicles. To accurately test the system, refer to the manufacturer’s diagnostic flow chart.
Before proceeding, consult the factory wiring diagrams to determine the wire connections. Autozone offers free online repair manuals for many vehicles, and ALLDATA offers single vehicle subscriptions.
Test The Camshaft Position Sensor
Most camshaft position sensors are either Hall Effect sensors or permanent magnet sensors. A Hall Effect sensor has three wires: reference, signal, and ground. On the other hand, a permanent magnet sensor only has two wires: signal and ground.
Test The Sensor Circuit
Test The Oil Control Solenoid
Disconnect the solenoid connector. Use a digital multimeter set to ohms to measure the internal resistance of the solenoid. Connect the meter between the solenoid B+ terminal and the solenoid ground terminal. Compare the resistance measurement to the factory repair specifications. If the meter displays a reading that is out of specification or out of limits (OL) indicating an open circuit, the solenoid should be replaced. It is also recommended to remove the solenoid and visually inspect the screen for any metal debris.
Check The Oil Control Solenoid Circuit
Check the timing chain and VVT actuators
If everything checks out up to this point, the issue may lie with the timing chain, corresponding components, or VVT actuators. Remove the necessary components to access the timing chain and actuators. Inspect the chain for excessive play, broken guides, and/or tensioners. Check the actuators for any visible damage, such as worn teeth.
