Knock Sensor 2 Circuit Malfunction (Bank 2)
There's a problem with the second knock sensor circuit on bank 2.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The engine control module (ECM) is trying to listen for engine knocks (pinging) to adjust timing but detects an issue with the sensor reporting its data.
What the computer is actually seeing
The ECM expects a voltage signal from the knock sensor between 0.5 and 4.5 volts. When the knock sensor detects a knock, it sends a higher voltage signal to the ECM. If the unit fails, it might see a voltage outside this range or no voltage at all.
What a healthy reading looks like
Normal knock sensor voltage should range between 0.5V to 4.5V depending on knock detection; typically, voltage should be around 2.5V at idle without knock events.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Inspect the wiring and connectors of the knock sensor for damage or corrosion. If present, repair or replace as necessary.
- 22. Check the knock sensor itself using a multimeter. Expect resistance around 2-4 kΩ. If out of spec, replace the sensor.
- 33. Test the voltage output of the knock sensor with the engine running. If the voltage is not within the expected range (0.5V - 4.5V), check for circuit continuity and integrity.
- 44. If all previous tests pass, inspect the ECM for faults. Verify ground and power pins to the ECM. If faulty, consider replacing the ECM.
Common causes
- Faulty knock sensor
- Open or shorted wiring in the knock sensor circuit
- Poor connection at knock sensor connector
- Oil or debris contamination of the sensor
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable, but could cause poor performance and knock-related engine damage over time, so fix it soon.
Will this code come back after clearing it?
If the issue isn't fixed, the code will reappear after a drive cycle.
Why would this code pair with other codes?
It's common for multiple codes to trigger from a single issue like a faulty knock sensor or wiring problems.
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