What it means
Knock sensor C signal above upper plausibility — open signal or short to B+. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Knock sensor C monitors combustion vibration on engines with multiple sensors, and its signal is used by the control module to adjust ignition timing. P032D sets when the signal is higher than expected; an open signal line or a short to battery voltage can produce that reading.
Common causes
Most likely first.
- Open signal line
- Gateway module routing CAN messages incorrectly
- CAN terminating resistor (120 Ω) drifted out of spec
Symptoms
- Check-engine light
- Reduced engine power or acceleration
- Engine knocking may be more noticeable
How to diagnose it
- Review freeze-frame and live data to confirm the high sensor C signal and note when it occurs.
- Locate knock sensor C using vehicle service information and inspect its connector and harness for loose, corroded, pushed-back, or damaged pins.
- Check the sensor C wiring for an open signal line or chafing that could allow contact with battery voltage.
- Test the sensor C circuit for continuity and a short to supply voltage using the circuit diagram and manufacturer's procedure.
- If the circuit checks out, test knock sensor C itself according to the manufacturer's procedure.
Common fixes
- Restore a secure connection at the sensor C connector.
- Repair an open signal wire or wiring shorted to battery voltage.
- Repair chafed wiring and secure the harness.
- Replace knock sensor C if it fails testing.
Can I keep driving?
Avoid hard acceleration and heavy loads until repaired; reduced power may occur, and the control module may not interpret knock on sensor C's monitored area correctly. Stop if persistent pinging is audible.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.