P0324 on 2025-2026 Buick Envision — Knock Control System Error
1 vehicles · 1 makes
Most Reported On
P0324 is an OBD-II diagnostic trouble code meaning “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. This code is most commonly reported on 2025-2026 Buick Envision.
Common Causes
Diagnostic Tools
To diagnose P0324, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
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BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
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LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
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Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
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- Oil reset, EPB, BMS, TPMS, injector coding
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FAQ
What does P0324 mean?
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.
What are the most common causes of P0324?
The most common causes of P0324 are: 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. The specific cause varies by vehicle.
How much does it cost to fix P0324?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by P0324?
Au7o has documented P0324 across 1 vehicle models from 1 manufacturers: Buick.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.