P0332 GMC Sierra 1500
Knock Sensor 2 Circuit Low Input (Bank 2) · Powertrain Code · Medium
What is P0332?
The knock sensor 2 on bank 2 is reading below expected voltage.
When the GMC Sierra 1500 triggers code P0332 (knock sensor 2 circuit low input (bank 2)), it typically points to an issue in the powertrain system. Below you'll find the most common causes, symptoms, and repair options specific to the GMC Sierra 1500.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your GMC Sierra 1500.
Common Causes on GMC Sierra 1500
- Failed knock sensor 2 (Bank 2)
- Corroded wiring harness for Bank 2 knock sensor under intake manifold
- Coolant intrusion from intake manifold gasket degrading connector
- Cracked knock sensor due to over-torquing or vibration
Symptoms
- Check Engine Light on
- Reduced engine power and performance
- Engine timing retarded by PCM as protective measure
- Slight fuel economy loss
Notes for GMC Sierra 1500
When replacing one knock sensor on a GM V8, always replace both sensors and the harness — the labor is 90% intake manifold removal, and the parts are cheap.