1.Illuminated Check Engine Light
The PCM monitors the CKP sensor and its circuit. If the module detects a problem, it will turn on the check engine light and store a corresponding diagnostic trouble code (DTC) in its memory.
2.Engine Refuses to Start
A gas-powered engine needs three primary ingredients to run: spark, an air-fuel mixture, and compression. When the CKP sensor fails, the PCM doesn’t know when to fire the spark plugs and pulse the fuel injectors. As a result, the engine may be starved of fuel and/or spark, resulting in a vehicle that refuses to start.
3.Hard Starting and/or Stalling
When the CKP sensor is on the fritz, it may produce a weak or erratic signal rather than failing completely. As a result, the vehicle may exhibit hard starting and/or stalling due to improper spark and fuel delivery.
4.Engine Runs Rough and Misfires
An erratic CKP sensor can cause the PCM to miscalculate fuel injector pulse and spark timing, resulting in an engine that runs rough and misfires. As the driver, you’ll likely interpret the misfire as a subtle shaking or stumble that may intensify when the vehicle is under load. If not corrected, the misfire can cause damage to other parts of the vehicle, such as the catalytic converter.
5.Reduced Fuel Economy
Obviously, an engine that’s running rough and misfiring (due to a faulty CKP sensor) will experience a reduction in fuel efficiency. A faulty CKP sensor may also prevent fuel-saving equipment, such as the variable valve timing and cylinder deactivation systems, from working properly.
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