May 13, 2023 Service bulletin

Flash: Powertrain Control Module (PCM) Updates Customers may experience a Malfunction Indicator Lamp (MIL)...

Jeep technical service bulletin 1804023 for 2023 Jeep Wagoneer.

Bulletin number: 1804023
Component: Power train: automatic transmission: control module (TCM/PCM/tecm)
Summary: Flash: Powertrain Control Module (PCM) Updates Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more of the following DTCs have been set: ? P0300-00 - Multiple Cylinder Misfire. ? P0301-00 - Cylinder 1 Misfire Detected. ? P0302-00 - Cylinder 2 Misfire. ? P0303-00 - Cylinder 3 Misfire ? P0304-00 - Cylinder 4 Misfire. ? P0305-00 - Cylinder 5 Misfire. ? P0306-00 - Cylinder 6 Misfire. ? P05CC-00 - Cold Start A Camshaft Position Timing Performance Bank 1. Customer may also experience the following: ? Poor or insufficient A/C performance during towing or other high torque maneuvers. ? Belt chirp is heard at startup or when A/C cycles on. This bulletin involves reprogramming the PCM with the latest available software.

Owners of these vehicles have filed 22 complaints in the transmission category.

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