GM Releases New Service Bulletin for 2023 Corvette Z06 Engine Tapping

Some customers with a 2023 Corvette Z06 have reported hearing engine tapping from the LT6 engine.

GM has now released a new service bulletin addressing the issue:

#23-NA-115: Ticking, Tapping or Snapping Noise from Engine – 5.5L RPO LT6 Realign Camshaft Caps as Required – (Jun 28, 2023)

Subject: Ticking, Tapping or Snapping Noise from Engine – 5.5L RPO LT6 Realign Camshaft Caps as Required

Condition: Some customers may comment on a ticking, tapping, or snapping noise from the engine.

Note: It is important to note that this engine incorporates a mechanical valve train design to enable maximum engine performance and does not use traditional hydraulic lifters and as a result there will be some mechanical tick noise from the valvetrain, which is normal. However, if the noise is excessive and not periodic, as described in this bulletin, this procedure can be used to reduce the noise. For reference, this ticking disturbance noise can be heard while the engine is idling and more noticeable with the hatch open and in tour mode. It may also be found that the noise slightly increases as the engine gets towards operating temperature.

Cause: This condition may be caused by the misalignment of the camshaft caps.

If your 2023 Corvette Z06 is experiencing this condition, make an appointment at your local Chevy dealer to have the issue diagnosed and addressed.