Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Circuit Description
The DTC P1335 Crankshaft Position (CKP) sensor circuit diagnostic detects a loss of crankshaft position sensor signal while engine is running. CKP sensor is a magnetic generator type sensor, producing an AC signal which increases in both frequency and amplitude as engine RPM increases. CKP sensor sends this reference signal to the Powertrain Control Module (PCM) to indicate RPM and crankshaft position. This reference signal along with camshaft position sensor signal is used by PCM to calculate the following:
- Ignition system timing.
- Fuel injection pulse width.
- Camshaft position phasing.
- Top dead center of piston travel.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.