CT4

611 service bulletins filed with NHTSA for this model year

• May 21, 2026UNKNOWN OR OTHERPIT6215C

  This Preliminary information communicates to dealership technicians that if they encounter a customer vehicle with this concern, to perform the steps listed and should be able to reprogram the module and correct this.

• May 21, 2026UNKNOWN OR OTHERPIP6115

  The document advise technicians after an engine repair involving removal of the camshaft actuators, the vehicle may set p1101 P0172 and or stalls when taken off idle. The technician is instructed to verify the intake and exhaust camshaft actuators are installed onto the correct camshafts.

• May 11, 2026UNKNOWN OR OTHERPIC6551B

  This Preliminary information communicates to dealer to perform a MEC reset for wireless projection issues

• May 11, 2026UNKNOWN OR OTHERPIC6423A

  Pi created to provide GM dealers with information on gathering information for projection issue

• Apr 25, 2026UNKNOWN OR OTHERPIT6511

  This Preliminary information communicates an issue with a replace or low FOB battery message

• Apr 20, 2026UNKNOWN OR OTHERPIT6507

  This PI communicates information on a SPS programming issue causing Serial Data Authentication Configuration to fail.

• Apr 1, 2026UNKNOWN OR OTHERPIT3271Q

  This preliminary information communicates information about how to determine if a wheel and tires size change is available.

• Mar 9, 2026UNKNOWN OR OTHERPIP6104

  This Preliminary information communicates the steps on how to save a GDS2 Session Log and upload to a Technical Assistance Case in CX Connect.

• and 603 more

Source: NHTSA manufacturer communications (technical service bulletins).