P0332 on GMC
Knock Sensor 2 Circuit Low Input (Bank 2)
P0332 on GMC vehicles indicates knock sensor 2 circuit low input (bank 2). Au7o has documented this code across 2 GMC models — most commonly on Sierra 1500, Yukon XL. This code means the Engine Control Module detected a low-voltage (or low-amplitude) signal from Knock Sensor 2 on Bank 2 — the cylinder bank that does not contain cylinder 1. The knock sensor 'listens' for engine detonation (pinging) so the computer can retard ignition timing to protect the engine. P0332 sets when this sensor's signal is consistently lower than expected, suggesting the sensor, its wiring, or connection is faulty. To stay safe, the ECM may pull timing, which can slightly reduce power and fuel economy. Typical repair costs on GMC range from $400 to $1,100, depending on the specific model and root cause.
Common Causes of P0332
- •Faulty knock sensor on Bank 2
- •Open or high-resistance wiring in the knock sensor circuit
- •Corroded or loose knock sensor connector
- •Poor ground for the knock sensor
- •Chafed or shorted sensor harness
- •Improper sensor torque/mounting (poor contact with the block)
- •Faulty ECM/PCM knock sensor input
P0332 on GMC by Model
GMC Sierra 1500(1 issue)
- Knock Sensor Water Intrusion Under Intake Causing Check Engine Light and Reduced Performance2000-2006
The 4.8L, 5.3L, and 6.0L Vortec engines used in early GMT800 Sierra trucks place the knock sensors in wells beneath the intake manifold, where water can collect and corrode the sensors or harness. Owners frequently report recurring check-engine lights, timing retard, and reduced power, especially after washing the engine bay or driving in wet conditions. GM issued service information addressing knock sensor corrosion and revised sealing practices.
GMC Yukon XL(1 issue)
- Knock Sensor Water Intrusion Under Intake Causing Check Engine Light2000-2006
The 4.8L, 5.3L, and 6.0L Vortec engines used in this generation commonly develop knock sensor faults because moisture collects in the valley beneath the intake manifold. Corrosion at the sensors or harness causes persistent P0327/P0332 codes, reduced spark advance, and occasional drivability complaints. This is a well-known GMT800 issue documented in GM service bulletins and owner forums.
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View P0332 across all makes →Frequently Asked Questions
What does P0332 mean on GMC?▼
P0332 stands for "Knock Sensor 2 Circuit Low Input (Bank 2)." This code means the Engine Control Module detected a low-voltage (or low-amplitude) signal from Knock Sensor 2 on Bank 2 — the cylinder bank that does not contain cylinder 1. The knock sensor 'listens' for engine detonation (pinging) so the computer can retard ignition timing to protect the engine. P0332 sets when this sensor's signal is consistently lower than expected, suggesting the sensor, its wiring, or connection is faulty. To stay safe, the ECM may pull timing, which can slightly reduce power and fuel economy. On GMC specifically, this code is documented across 2 models.
What causes P0332 on GMC vehicles?▼
Common causes on GMC: Faulty knock sensor on Bank 2, Open or high-resistance wiring in the knock sensor circuit, Corroded or loose knock sensor connector, Poor ground for the knock sensor, Chafed or shorted sensor harness. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0332 on a GMC?▼
Repair costs on GMC range from $400 to $1,100, depending on the specific model and root cause.
Which GMC models have P0332 documented?▼
Au7o has documented P0332 on 2 GMC models: Sierra 1500, Yukon XL.