CT4 AWD

202 service bulletins filed with NHTSA for this model year

• Jun 3, 2026UNKNOWN OR OTHERPIT6503A

  This preliminary information is to inform technicians that GM is placing the B174W Front View Camera Module (ACP2) on part restriction due to elevated replacement rates and ongoing engineering investigation. Technicians must not replace the front camera module unless they have: 1.Completed the diagnostic procedure in this PI, and 2.Contacted TAC and received authorization, including the SI document number and specific step that directs camera replacement.

• May 27, 2026UNKNOWN OR OTHERPIT6519

  This preliminary information is to inform technicians and customers that the voice command will be inoperative when trying to open applications. Engineering is investigating and this PI will be converted to a bulletin when a repair is available.

• 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 14, 2026UNKNOWN OR OTHERPIC6540J

  This Preliminary information communicates to dealers a procedure to reset the radio.

• May 11, 2026UNKNOWN OR OTHERPIT6513

  This PI states that if SDGM DTC U3000 Sym 49 is set and no other SDGM DTCs are present, clear DTCs and reset the SDGM. Advises of how to contact PQC to authorize SDGM replacement.

• May 11, 2026UNKNOWN OR OTHERPIP6101B

  The document makes technicians aware of a valvetrain tick noise that is created by one or more soft hydraulic valve lash adjusters. The soft lash adjuster concern is due to debris from the valve rocker arm, entering into the lash adjuster. The document instructs the technician to replace all of the lash adjusters and rocker arms in the entire engine if any soft lash adjusters are found.

• May 11, 2026UNKNOWN OR OTHERPIC6551B

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

• and 194 more

Source: NHTSA manufacturer communications (technical service bulletins).