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 (CKP) harness is open or shorted
- Poor electrical connection in crankshaft position sensor (CKP) circuit
- Signal plate may be damaged
- Starter may be faulty
- Starting system circuit
- Dead or weak battery
What does this mean?
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 modification of the magnetic field near the sensor. The change in the magnetic field causes a change in the sensor voltage.
How to Fix
Check the “Possible Causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
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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 service engine soon warning light)
- Lack/loss of power
- Engine stalling