Possible Causes
NOTE: The listed causes may not be a complete list of all potential problems and there may be other causes.
- Faulty crankshaft position sensor
- Crankshaft position sensor wiring harness is open or short-circuited
- Poor electrical connection in the crankshaft position sensor circuit
- The signal plate may be damaged
- The starter may be faulty
- Starter system circuit
- Dead or weak battery
Technical Notes
Sometimes and on certain models, low battery voltage or a weak starter can trigger a crankshaft position sensor code. Before replacing parts, recharge or replace the battery.
Description
The crankshaft position sensor (CKP), also known as the crankshaft position sensor, is an electronic device used in an engine to record the speed at which the crankshaft rotates. This information is used by the engine control module (ECM) to control ignition and fuel injection. The sensor system consists of a rotating part, usually a disk, as well as a static part, the sensor itself.
When the engine rotates, the high and low parts of the teeth cause a change in the gap with the sensor. The changing gap results in a change in the magnetic field near the sensor. The change in the magnetic field causes a change in the sensor voltage.
How to Repair
Check the “Possible Causes” listed above. Visually inspect the wiring harness and associated connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
Detected
– The crankshaft position sensor (POS) signal is not detected by the ECM during the first few seconds of engine starting
– The proper pulse signal from the crankshaft position sensor
Possible Symptoms
- Engine light on (or engine maintenance warning light soon)
- Lack/loss of power
- Engine stalling
- Engine hard to start