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.
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HOMESERVICE MANUALSCHEVROLET2000CAB & CHASSIS C2500, 6.5 F, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM & COMPONENT TESTSIGNITION SYSTEMTIMING CONTROL SYSTEMSKNOCK SENSOR CIRCUIT (MODELS USING KNOCK SENSOR WITH INTERNAL SPARK CONTROLLER MODULE)
2000 Chevrolet Cab & Chassis C2500, 6.5 F, Automatic
Knock Sensor Circuit (Models Using Knock Sensor With Internal Spark Controller Module)
2000 Chevrolet Cab & Chassis C2500, 6.5 F, AutomaticSECTION Knock Sensor Circuit (Models Using Knock Sensor With Internal Spark Controller Module)
- An open or short circuit on knock sensor wire to PCM will set a related DTC. A false detonation signal will not cause PCM to set a DTC.
- Install scan tool. Using a metal object, tap on engine next to knock sensor and note knock parameter. Knock should be indicated on scan tool.
- If a scan tool is not available, connect tachometer to engine. Start engine and hold RPM above idle. Using a metal object, tap on engine close to knock sensor. A noticeable decrease in engine RPM should occur. If no RPM decrease occurred, check knock sensor-to-PCM circuit.
- On vehicles equipped with automatic transmission, it may be necessary to place transmission in Drive for timing change to occur.
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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.