P0330: How to Diagnose & Fix — Knock Sensor 2 Circuit (Bank 2)
6 vehicles · 5 makes · $150-$1,200 repair
How to diagnose and fix P0330: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Hyundai Veloster · 2019–2021
Some naturally aspirated 2.0L Veloster owners report check-engine lights, rough running, and reduced-power behavior tied to knock sensor activity or engine protection logic. While not as notorious as older Hyundai engine campaigns, the symptom pattern is documented enough to appear in owner complaints and service discussions: the car may suddenly feel flat, limit RPM, or illuminate the MIL even when no obvious mechanical noise is present. In some cases the issue is sensor-related; in others it requires ruling out genuine detonation, wiring faults, or software sensitivity.
Common Symptoms
- check engine light
- reduced power
- engine feels flat or limited
- intermittent rough running
- RPM limited
How to Fix
Scan for knock-sensor and misfire-related codes, inspect harness routing and connector condition, and verify fuel quality and ignition system health. If no mechanical problem is found, dealers may update software or replace the knock sensor/harness as needed. Persistent knock-related faults should not be ignored because the ECU may be actively protecting the engine from perceived abnormal combustion.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Hyundai knock sensor assemblyOEMHyundai 39250-2E000
knock-sensor replacement after testing confirms a sensor/circuit fault and mechanical knock is ruled out Fitment/availability: Hyundai 39250-2E000 is cataloged for 2019-2021 Veloster with the naturally aspirated DOHC-MPI engine. Confirm …
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Sources for this issue (1)
Chevrolet Silverado 1500 · 2000–2006
On 4.8L, 5.3L, and 6.0L GMT800 V8 trucks, the valley-mounted knock sensors and harness are prone to water intrusion from the cowl/intake area. Moisture corrodes the sensors or harness connectors, leading to false knock readings, a check engine light, and timing retard that can make the truck feel sluggish. This is one of the best-known early Silverado engine electrical issues and is heavily documented by owners and repair shops.
Common Symptoms
- check engine light
- reduced power or sluggish acceleration
- poor fuel economy
- intermittent spark knock timing retard
- engine runs normally but stores knock sensor codes
How to Fix
Diagnosis should confirm sensor circuit faults and inspect the harness and sensor wells for corrosion or standing water. Repair typically includes replacing both knock sensors, the sub-harness, intake gaskets, and the rubber seals/grommets, while cleaning the valley and addressing any water entry path. Using dielectric protection and updated sealing practices helps prevent repeat failures.
Sources for this issue (1)
GMC Sierra 1500 · 2000–2006
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.
Common Symptoms
- check engine light
- reduced power
- poor acceleration
- intermittent spark retard
- codes return after rain or washing
- rough running under load
How to Fix
Diagnosis involves scanning for knock sensor circuit codes, checking freeze-frame data, and inspecting the sensor wells and sub-harness under the intake for moisture or corrosion. Proper repair is replacement of both knock sensors and the harness, cleaning the valley area, and resealing the intake and sensor openings with the updated grommets/sealant procedure to prevent repeat failures.
Sources for this issue (1)
GMC Yukon XL · 2000–2006
Toyota 4Runner · 1996–2002
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P0330 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0330 mean?
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.
What are the most common causes of P0330?
The most common causes of P0330 are: 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). The specific cause varies by vehicle.
How much does it cost to fix P0330?
Repair costs for P0330 range from $150 to $1,200, depending on the vehicle and root cause.
Which vehicles are affected by P0330?
Au7o has documented P0330 across 6 vehicle models from 5 manufacturers: Chevrolet, GMC, Hyundai, Lexus, Toyota.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.