Technical Description of OBD-II Trouble Code
Range/Performance Issue with Crankshaft Position Sensor A Circuit
What does that signify?
This diagnostic trouble code (DTC) is a generic powertrain code that applies to all makes and models of vehicles (1996-newer). However, the specific repair steps may vary slightly depending on the model.
The crankshaft position sensor (CKP) is typically a two-wire sensor consisting of a signal wire and a ground wire. It is mounted in front of a toothed wheel called a reluctor, which is attached to the crankshaft.
As the reluctor wheel passes in front of the crank sensor, it generates an A/C signal that varies with engine speed. The powertrain control module (PCM) uses this signal to determine the engine RPM. Some crank sensors are hall-effect sensors instead of permanent magnet sensors. These hall-effect sensors have three wires for voltage, ground, and signal. They also have a reluctor wheel with vanes and “windows” that modify the voltage signal to the PCM, providing an RPM signal. However, this explanation will focus on the simpler and more common permanent magnet sensors.
The crankshaft reluctor has a specific number of teeth, and the PCM can determine the crankshaft position by analyzing the pattern created by these teeth. The PCM also uses this sensor, in conjunction with the camshaft position sensor (CMP), to determine the timing of spark and fuel injection. If the PCM detects a loss of CKP sensor signal (RPM signal), it may trigger the P0336 code.
Other related trouble codes for the crank position sensor include:
Symptoms
The symptoms of a P0336 DTC may include:
Causes
Possible causes of a P0336 code include:
Possible Solutions
Crankshaft sensor problems can sometimes be intermittent, and the vehicle may start and run normally until the issue occurs. Try to replicate the complaint. If the engine stalls or fails to start and continue running, crank the engine while observing the RPM reading. If there is no RPM reading, check for a signal coming from the crank sensor. Using a scope is ideal, but if you don’t have access to one, you can use a code reader or tachometer to check for an RPM signal.
Visually inspect the CKP harness for any damage or cracks in the wiring insulation. Repair as necessary. Ensure that the wiring is not routed near high voltage spark plug wires. Check for loose connections or a broken lock at the sensor connector. Repair as necessary. Obtain the resistance specification for the crank sensor and remove it for testing. If it fails the test, replace it. If it passes, inspect the reluctor ring for damage, broken teeth, or debris lodged in the ring. Make sure the reluctor ring is securely in place on the crankshaft. Carefully repair or replace it as needed. Note that some reluctor rings may be located in the bell housing of the transmission or behind the front engine cover, making them difficult to access.
If the vehicle stalls intermittently and you have no RPM signal after stalling, and you have confirmed that the wiring to the CKP sensor is in good condition, consider replacing the sensor. If that does not resolve the issue and you cannot access the reluctor ring, seek assistance from an automotive professional.
