What Does P0330 Mean?
A malfunction has been detected in the knock sensor 2 circuit on Bank 2 of a V-type or opposed engine. This sensor monitors detonation on the second bank of cylinders and provides feedback to the PCM for timing control. Without proper knock detection on Bank 2, the PCM will apply conservative timing to those cylinders, resulting in reduced power and fuel economy from that bank.
Common Causes
30%
Failed knock sensor 2 with no piezoelectric output
25%
Open or damaged wiring in the knock sensor 2 circuit
20%
Corroded or loose knock sensor 2 connector
15%
Incorrect knock sensor 2 torque or damaged mounting surface
10%
PCM internal knock sensor input circuit fault
Diagnostic Steps
1
Locate knock sensor 2 on Bank 2 (typically the bank that does not contain cylinder #1) and verify it is accessible. On many V-engines, this sensor is under the intake manifold.
2
Measure knock sensor 2 resistance: typical range is 50K–600K ohms. An open or short reading indicates sensor failure.
3
Monitor the knock sensor 2 PID while tapping the Bank 2 engine block with a small hammer — the signal should spike. Compare to knock sensor 1 response.
4
Inspect the wiring from sensor 2 to the PCM for damage, paying special attention to areas near exhaust crossover pipes and transmission bellhousing where heat is extreme.
5
If the sensor is under the intake manifold, check for coolant or oil leaks that may have contaminated the sensor and mounting surface.
Estimated Repair Cost
$100 - $500
Parts + labor, varies by vehicle and location
A malfunction has been detected in the knock sensor 2 circuit on Bank 2 of a V-type or opposed engine. This sensor monitors detonation on the second bank of cylinders and provides feedback to the PCM for timing control. Without proper knock detection on Bank 2, the PCM will apply conservative timing...
The most common cause of P0330 (Knock Sensor 1 Circuit Intermittent (Bank 1 or Single Sensor)) is: Failed knock sensor 2 with no piezoelectric output
Typical repair costs for P0330 range from $100 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive, but Bank 2 cylinders will run with retarded timing, reducing overall power and efficiency. Avoid heavy loads and aggressive driving. Use premium fuel as a precaution. Schedule repair within a few weeks, noting that intake manifold removal may be required for access.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0330 to identify the root cause.
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Quick Info
Category
Powertrain
System
Ignition / Knock Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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