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
Knock sensor cannot differentiate between spark knock and other similar engine noises. When knock sensor cannot eliminate noise by retarding spark timing, DTC will set. The knock circuit is continuously monitored for these parameters.
DTC will set if PCM cannot reduce spark knock (as seen by knock sensor) by retarding timing. Knock sensor activity is probably due to engine noise and not spark knock. This diagnostic is run with engine running and cylinder in combustion event window.
NO RELATED
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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.