P0330: Knock Sensor 2 Circuit Malfunction (Bank 2)
Can you still drive? Yes, but performance will be reduced. The ECM retards ignition timing as a precaution, which reduces power and fuel efficiency. Avoid heavy loads and aggressive driving.
What Does P0330 Mean?
Code P0330 indicates that the ECM has detected a malfunction in the knock sensor 2 circuit on engine bank 2. The knock sensor detects abnormal engine vibration caused by detonation (knocking) and signals the ECM to retard ignition timing to prevent engine damage. A failed sensor means the ECM cannot detect knock on bank 2 and will typically retard timing as a precaution.
Need to read your codes?
An OBD-II scanner lets you read and clear diagnostic trouble codes from your vehicle's computer. Most scanners work with any car made after 1996.
Browse OBD-II Scanners on AmazonCommon Causes
- Failed knock sensor 2
- Corroded or damaged sensor wiring
- Loose knock sensor mounting bolt (incorrect torque)
- Faulty ECM knock sensor input circuit
- Engine block surface corrosion under sensor
Symptoms
- Check engine light on
- Reduced engine power from retarded timing
- Decreased fuel economy
- Possible engine knocking or pinging under load
- Sluggish acceleration
Diagnostic Steps
- 1Read freeze frame data for operating conditions at time of fault
- 2Check knock sensor 2 wiring and connector for damage
- 3Measure knock sensor resistance (typically 50K-600K ohms depending on type)
- 4Verify proper torque on knock sensor mounting bolt (critical for piezoelectric sensors)
- 5Monitor knock sensor signal with scan tool during driving under load
- 6Clean engine block mounting surface if corroded
Recommended Parts & Tools
knock sensor wiring harness
torque wrench
anti-seize compound
Estimated Repair Cost
| Type | Estimated Cost |
|---|---|
| Total Repair Cost Range | $100 - $600 |
Get a Personalized AI Diagnostic Report
Get a detailed AI diagnosis for code P0330 specific to your vehicle. Includes step-by-step repair instructions, exact parts needed, and a cost breakdown tailored to your make and model.
Chat with AI About P0330Commonly Affected Vehicles
Related Recalls
Frequently Asked Questions
What is engine knock?
Engine knock (detonation) occurs when fuel ignites prematurely or unevenly in the cylinder, creating a sharp metallic pinging sound. It can cause piston and rod bearing damage if not controlled by retarding ignition timing.
Why is the knock sensor difficult to replace on some vehicles?
On many V6 engines, the knock sensors are mounted under the intake manifold, requiring significant disassembly to access. This is why labor costs can be high for this repair despite the sensor itself being relatively inexpensive.
Community Fix Reports
Community reports are user-submitted and not verified by Auto AI Buddy. Results may vary.
Related Codes
Affiliate Disclosure: This page contains affiliate links. If you purchase products through these links, we may earn a small commission at no additional cost to you. This helps us maintain this free resource. We only recommend products we believe will help you diagnose and repair your vehicle. Prices shown are estimates and may vary.