RAM Promaster 2018–2019 — technical service bulletin
Bulletin 18-073-26 · NHTSA communication 11035323 · issued Jul 22, 2026
Technical service bulletin
communication type
Power Train
component
2018–2019
model years
2
vehicle entries
Official summary
Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle exhibit/set SYMPTOM: 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. ● P0556 - Brake Booster Pressure Sensor Circuit Performance. ● P0340 - Cam Position Sensor Circuit - Bank 1 Intake. ● P0345 - Cam Position Sensor Circuit - Bank 2 Intake. ● P0365 - Cam Position Sensor Circuit - Bank 1 Exhaust. ● P0390 - Cam Position Sensor C
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.