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January 16, 2026 Service bulletin

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

Ram technical service bulletin 18-002-26 for 2026 Ram 2500, 2026 Ram 3500 and 2026 Ram 5500 and others.

Bulletin number
18-002-26
Component
Power train
Summary
Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P0420 - Catalyst System Efficiency Below Threshold Bank 1. ● P0430 - Catalyst System Efficiency Below Threshold Bank 2. Customers may also experience the following: ● Catalyst damage and restricted exhaust flow, resulting in a reduction of engine power. This bulletin involves reprogramming the PCM with the latest available software.

Owners of these vehicles have filed 7 complaints in the transmission category.

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