Knock Sensor Inspection

A wiring harness condition or loose knock sensor bolt may be found on some 2020 Camaros with the 2.0L 4-cylinder engine (RPO LTG). The Check Engine light may be illuminated along with DTC P0331 (Knock Sensor 2 Performance) set in the Engine Control Module.

If there is a knock in the engine, inspect for a loose knock sensor #2 bolt using the appropriate size tool to measure torque. The illustration shows knock sensor #2 (Fig. 18, #1), knock sensor #1 (Fig. 18, #2), and the bolts for the knock sensors (Fig. 18, #3).


Fig. 18


Apply torque to the fastener in the tightening direction until it just begins to move and record the peak torque/breakaway torque on the repair order. (Breakaway torque spec ≥ 10 Nm).

TIP: Tightening the retaining bolt too much or simply dropping the knock sensor on the ground can damage it.

Also perform the following inspections:

  • Check for any moisture or water intrusion and/or deposits on the knock sensor #2 terminal or wiring harness connectors.
  • Check the block mating face for any thread damage (uniformity) or debris, or any other abnormality, including the knock sensor #2 bolt thread.
  • Check knock sensor #2 and the block surface for any rust (red rust or white powder).

Use air to clean any residual foreign material from both the bolt and hole threads before reinstalling the existing knock sensor.

In addition, check for potential system issues linked to engine knock. Refer to the appropriate Service Information for possible mechanical knock/tapping (piston, main bearing under load, valve train noise at high speed, etc.) and complete repairs as needed.

Do not replace the knock sensor unless there is physical damage or improper performance found with the part.

Refer to #PIP5773 for additional information.


– Thanks to David Rutkowski

Sunroof Drain Hose Extensions
Exhaust Charge DTC Diagnostics

Leave a Reply

Your email address will not be published. Required fields are marked *