2020 Pontiac P0325: What It Means & Is It Safe to Drive?
P0325 on the 2020 Pontiac: Knock Sensor 1 Circuit Malfunction (Bank 1). Here's what it means, what usually causes it, what repairs typically cost, and whether it's safe to keep driving.
What this code means
The PCM isn't receiving a valid signal from knock sensor 1. Without knock feedback, the PCM retards ignition timing as a safety measure, reducing power and economy.
Common causes on the 2020 Pontiac
- Failed knock sensor
- Corroded or broken wiring/connector at the sensor
- Actual engine knock from carbon buildup or low-octane fuel
Symptoms
- Check Engine Light
- Reduced power and fuel economy (PCM retards timing)
- Possible audible knock or ping under load
Typical fixes
- Replace knock sensor
- Repair wiring and connector
- Use correct octane fuel and address carbon buildup
Repair cost range
For a 2020 Pontiac, repairs for P0325 typically fall between $150 and $500, depending on the root cause and labor rates in your area.
Known issues on Pontiac
Pontiac G6 3.5L/3.9L V6 (LX9/LZ4)—knock sensor is mounted on the engine block and accessible after removing the intake manifold upper plenum. The harness connector corrodes from moisture trapped under the intake. On G8 6.0L LS2 V8, P0325 is uncommon; check both bank sensors (P0325 = Bank 1, P0330 = Bank 2) and inspect the harness for heat damage near the exhaust manifold. Pontiac Firebird 3.8L Series II uses a piezoelectric knock sensor—connector corrosion is the typical failure; replace the connector and sensor as a pair.
Most commonly affected models