P0324 on Chevrolet
Knock Control System Error
P0324 on Chevrolet vehicles indicates knock control system error. Au7o has documented this code across 1 Chevrolet model — most commonly on Trax. The PCM has detected an internal fault or an implausible input within the knock-control system. The knock control system uses one or more knock (detonation) sensors to listen for combustion knock/ping and lets the PCM retard ignition timing and adjust fueling to prevent detonation. P0324 sets when the module receives an unexpected knock-sensor signal (for example the circuit reading battery voltage, a full ground, or constant electrical noise) or when the internal knock-processing self-test fails, so the PCM can no longer trust its knock detection. Losing knock control can allow damaging detonation and typically causes the PCM to pull timing as a protective default.
Common Causes of P0324
- •Failed knock (detonation) sensor
- •Damaged, corroded, or loose knock sensor wiring, connector, or terminals
- •Short to voltage or short to ground in the knock sensor circuit
- •Excessive engine mechanical noise mimicking knock (worn components) confusing the system
- •Internal PCM / knock-processing fault, or PCM needing a software update
P0324 on Chevrolet by Model
Chevrolet Trax(1 issue)
- Engine Knock and Check Engine Light After Auto Stop/Start - ECM Ignition Timing Control (Field Action DCS6982)2024
GM issued urgent dealer message DCS6982 on August 14, 2024 covering 2024 vehicles with the 1.2L gasoline engine - Chevrolet Trax and Trailblazer, Buick Encore GX and Envista. The engine control module may fail to properly control ignition timing following certain Auto Engine Stop/Start restart events. When that happens the malfunction indicator lamp comes on and the engine runs rough or audibly knocks; GM's own bulletin warns that continuing to drive with the knock present can cause engine damage. The matching service bulletin, 24-NA-064, directs technicians to reprogram the ECM when the MIL is set with DTC P0324 (knock control system error) and/or P0116 (engine coolant temperature sensor performance). Because detonation on a small-displacement turbo three is exactly the loading that hurts rod bearings, this is worth chasing promptly rather than living with.
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View P0324 across all makes →Frequently Asked Questions
What does P0324 mean on Chevrolet?▼
P0324 stands for "Knock Control System Error." The PCM has detected an internal fault or an implausible input within the knock-control system. The knock control system uses one or more knock (detonation) sensors to listen for combustion knock/ping and lets the PCM retard ignition timing and adjust fueling to prevent detonation. P0324 sets when the module receives an unexpected knock-sensor signal (for example the circuit reading battery voltage, a full ground, or constant electrical noise) or when the internal knock-processing self-test fails, so the PCM can no longer trust its knock detection. Losing knock control can allow damaging detonation and typically causes the PCM to pull timing as a protective default. On Chevrolet specifically, this code is documented across 1 model.
What causes P0324 on Chevrolet vehicles?▼
Common causes on Chevrolet: Failed knock (detonation) sensor, Damaged, corroded, or loose knock sensor wiring, connector, or terminals, Short to voltage or short to ground in the knock sensor circuit, Excessive engine mechanical noise mimicking knock (worn components) confusing the system, Internal PCM / knock-processing fault, or PCM needing a software update. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0324 on a Chevrolet?▼
Repair costs vary widely depending on the root cause and specific Chevrolet model.
Which Chevrolet models have P0324 documented?▼
Au7o has documented P0324 on 1 Chevrolet model: Trax.