Fault Family System: Powertrain (P-Codes) 21 SAE Codes

Knock Sensor Circuit

Diagnostic & Technical Explanation

Code P0324 (Knock/Combustion Vibration Control System Error) sets when the ECM detects an open circuit, out-of-range voltage, or a total loss of signal from a knock (combustion vibration) sensor used to retard timing and protect the engine from detonation, or when the overall knock control system itself reports an internal error. Physical causes are a failed piezoelectric sensor element, an improperly torqued sensor (knock sensors are torque-sensitive and read incorrectly if over- or under-tightened), or chafed/corroded wiring between the sensor and the ECM.

These 21 diagnostic trouble codes share one detection mechanism and one repair path, which is why MechanicDB groups them into a single authored fault family rather than repeating the same explanation 21 times.

Codes in this family (21)

Code	Definition	Repair coverage
P0324	Knock/Combustion Vibration Control System Error	4 ranked fixes
P0325	Knock/Combustion Vibration Sensor A Circuit	4 ranked fixes
P0326	Knock/Combustion Vibration Sensor A Circuit Range/Performance	4 ranked fixes
P0327	Knock/Combustion Vibration Sensor A Circuit Low	4 ranked fixes
P0328	Knock/Combustion Vibration Sensor A Circuit High	4 ranked fixes
P0329	Knock/Combustion Vibration Sensor A Circuit Intermittent	4 ranked fixes
P032A	Knock/Combustion Vibration Sensor C Circuit	4 ranked fixes
P032B	Knock/Combustion Vibration Sensor C Circuit Range/Performance	4 ranked fixes
P032C	Knock/Combustion Vibration Sensor C Circuit Low	4 ranked fixes
P032D	Knock/Combustion Vibration Sensor C Circuit High	4 ranked fixes
P032E	Knock/Combustion Vibration Sensor C Circuit Intermittent	4 ranked fixes
P0330	Knock/Combustion Vibration Sensor B Circuit	4 ranked fixes
P0331	Knock/Combustion Vibration Sensor B Circuit Range/Performance	4 ranked fixes
P0332	Knock/Combustion Vibration Sensor B Circuit Low	4 ranked fixes
P0333	Knock/Combustion Vibration Sensor B Circuit High	4 ranked fixes
P0334	Knock/Combustion Vibration Sensor B Circuit Intermittent	4 ranked fixes
P033A	Knock/Combustion Vibration Sensor D Circuit	4 ranked fixes
P033B	Knock/Combustion Vibration Sensor D Circuit Range/Performance	4 ranked fixes
P033C	Knock/Combustion Vibration Sensor D Circuit Low	4 ranked fixes
P033D	Knock/Combustion Vibration Sensor D Circuit High	4 ranked fixes
P033E	Knock/Combustion Vibration Sensor D Circuit Intermittent	4 ranked fixes

What this page does not show

This page publishes the fault mechanism and the code index. The licensed dataset adds, for every one of the 15,886 codes, the full authored repair set (56,729 procedures in total) with the fields deliberately withheld here:

Procedures 2..n after the first-listed procedure
Aftermarket parts cost ranges in USD (est_parts_cost_min/max_usd)
Professional labor-hour estimates (est_labor_hours)
Step-by-step diagnostic and repair instructions
Replacement-part mappings and catalog lookups
6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)

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