P032D

What it means

P032D is the generic code for a high signal in the circuit of knock or combustion vibration sensor C. The engine control unit saw the sensor signal voltage stay above its expected range, which suggests a short to voltage, a wiring fault or a failed sensor. Which cylinder bank or position 'C' refers to depends on the engine, so check the manufacturer's information for the vehicle.

Symptoms

• Engine warning light on
• Reduced power or flat response under load
• Rough running or pinking (detonation) under load
• Poorer fuel economy
• Ignition timing retarded by the control unit as a protective measure

Possible causes

• Faulty knock or combustion vibration sensor (internal failure)likely
• Damaged, chafed or corroded wiring or connector on the sensor circuitlikely
• Signal wire shorted to a voltage supply or the signal circuit open with a pulled-up signalpossible
• Sensor loose or incorrectly torqued, or wrong sensor fitted after previous workpossible
• Water or oil contamination in the connector or harnesspossible
• Fault inside the engine control unitrare

How to diagnose

1. Read all stored and pending codes and note the freeze frame data, such as load, engine speed and temperature, when the fault set.
2. Look up the sensor position for 'C' on this specific engine, as the location varies by model and engine.
3. Inspect the sensor, harness and connector for damage, corrosion, oil or water ingress, and check for chafing against the engine or brackets.
4. Check the sensor mounting is secure and the torque is correct, and that the sensor is clean and seated flat.
5. With the ignition on and the sensor unplugged, check for unwanted voltage on the signal wire and compare against the manufacturer's specification.
6. Check the signal and ground wires for continuity and for short circuits to voltage or to each other.
7. Measure the sensor's resistance or output where the manufacturer gives figures, and check live data for a signal stuck high.
8. Clear the code and road test, rechecking live data to confirm the fault does not return.

How to fix

• Replace the knock or combustion vibration sensor if it fails testing, tightening to the specified torque.
• Repair or replace damaged wiring, and clean or renew corroded or contaminated connectors.
• Clear any short to voltage in the harness and secure the loom away from heat and abrasion.
• Refit or correct the sensor mounting where it is loose or wrongly fitted.
• Diagnose and repair or replace the engine control unit only after wiring and sensor faults are ruled out.

Can I keep driving?

Nearby codes

• P032CGenericKnock/Combustion Vibration Sensor C Circuit Low
• P032EGenericKnock/Combustion Vibration Sensor C Circuit Intermittent