P0330 on GMC
Knock Sensor 2 Circuit (Bank 2)
P0330 on GMC vehicles indicates knock sensor 2 circuit (bank 2). Au7o has documented this code across 2 GMC models — most commonly on Sierra 1500, Yukon XL. This powertrain code means the engine computer detected a malfunction in the circuit for knock sensor 2, located on engine bank 2 (the cylinder bank not containing cylinder 1). The knock sensor listens for engine 'knock' or 'ping' (abnormal combustion) and lets the computer retard ignition timing to prevent engine damage. This code indicates an electrical/circuit problem with the sensor signal, not necessarily actual knocking. Drivability is often normal, but the engine may run with conservative timing, reducing power and economy and risking damage if real knock occurs. Typical repair costs on GMC range from $400 to $1,100, depending on the specific model and root cause.
Common Causes of P0330
- •Faulty knock sensor on bank 2
- •Damaged or corroded knock sensor wiring/connector
- •Open or short in the knock sensor circuit
- •Loose or improperly torqued knock sensor
- •Engine ground or shielding issues affecting the signal
- •Faulty engine control module (rare)
P0330 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.
Looking for P0330 on a different make?
View P0330 across all makes →Frequently Asked Questions
What does P0330 mean on GMC?▼
P0330 stands for "Knock Sensor 2 Circuit (Bank 2)." This powertrain code means the engine computer detected a malfunction in the circuit for knock sensor 2, located on engine bank 2 (the cylinder bank not containing cylinder 1). The knock sensor listens for engine 'knock' or 'ping' (abnormal combustion) and lets the computer retard ignition timing to prevent engine damage. This code indicates an electrical/circuit problem with the sensor signal, not necessarily actual knocking. Drivability is often normal, but the engine may run with conservative timing, reducing power and economy and risking damage if real knock occurs. On GMC specifically, this code is documented across 2 models.
What causes P0330 on GMC vehicles?▼
Common causes on GMC: Faulty knock sensor on bank 2, Damaged or corroded knock sensor wiring/connector, Open or short in the knock sensor circuit, Loose or improperly torqued knock sensor, Engine ground or shielding issues affecting the signal. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0330 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 P0330 documented?▼
Au7o has documented P0330 on 2 GMC models: Sierra 1500, Yukon XL.