# Service bulletin 08\-237\-26

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 11033943
- Published by NHTSA: 2026\-06\-18
- Manufacturer's number: 08\-237\-26
- Manufacturer's date: 2026\-06\-11
- NHTSA component: SERVICE BRAKES

## NHTSA's summary

Flash: Brake System Control Module \(BSCM\) Update Customers may comment on the following: ● Anti\-Lock Brake System \(ABS\), Electronic Stability Control \(ESC\), 'Decel ACC' lights on in Instrument Panel Cluster \(IPC\). Technicians may find the following: ● Diagnostic Trouble Code \(DTC\) "C121A\-00 \- Steering Angle Sensor Not Initialized" is stored with no Malfunction Indicator Lamp \(MIL\) illuminated This bulletin involves reprogramming the BSCM with the latest available software.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11033943-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11033943-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Brakes

## Trouble codes named

C121A

## Vehicles listed

- 2025 RAM 1500

## Other bulletins for the same vehicles and component

- [114911](/bulletins/11038552.md), 2026-10-16, Service bulletin: SERVICE BRAKES. ACTUATOR \- PARK BRAKE
- [114911](/bulletins/11038515.md), 2026-10-16, Service bulletin: SERVICE BRAKES. ACTUATOR \- PARK BRAKE
- [08\-305\-26](/bulletins/11035978.md), 2026-08-06, Service bulletin: SERVICE BRAKES; ELECTRICAL SYSTEM. Flash: Brake System Control Module \(BSCM\) Updates \*\*Customers may experience one or more of the following: SYMPTOM: ● Warning message "Selec\-Speed Unavailable" appears in the Instrument Panel Cluster \(IPC\) when trying to enable the Selec\-Speed Control \(SSC\) function. NOTE: There will be no Diagnostic Trouble Codes \(DTCs\) and no driveability concerns with this symptom.\*\* ● Anti\-Lock Brake System \(ABS\), Electronic Stability Control \(ESC\) and 'Decel ACC' lights on in the IPC. Technicians may also find the following: ● DTC C121A\-00 \- Steering Angle Sensor Not Initialized \- Is stored with no Malfunction Indicator Lamp \(MIL\). This bulletin involves reprogramming the BSCM with the latest available software.
- [113123](/bulletins/11034908.md), 2026-07-08, Service bulletin: SERVICE BRAKES. SPRING KIT \- DISC BRAKE PAD
- [S2605000002](/bulletins/11030047.md), 2026-03-13, Service bulletin: SERVICE BRAKES. Whoosh Or Click Noise Heard From Brake Assembly eBooster When Pressing Brake Pedal And After A Recent Repair.
- [03D Campaign](/bulletins/11029785.md), 2026-03-05, Other: SERVICE BRAKES; ELECTRICAL SYSTEM. Fleet Campaign Parts Ordering Process \(03D\)
- [110463](/bulletins/11029761.md), 2026-03-05, Service bulletin: SERVICE BRAKES; ELECTRICAL SYSTEM. SWITCH \- TRAILER BRAKE CONTROL MODULE , ADAPTER \& WIRING KIT \- TRAILER TOW.
- [110082](/bulletins/11028785.md), 2026-02-12, Service bulletin: SERVICE BRAKES; ELECTRICAL SYSTEM. MODULE \- TRAILER BRAKE \& TOWING CONTROL
- [S2505000003](/bulletins/11026634.md), 2025-12-17, Service bulletin: SERVICE BRAKES. Diagnostic Trouble Code \(DTC\) C0050\-00\-Brake System Hydraulic Leak Set After Recent Repair.
- [S2523000091](/bulletins/11026632.md), 2025-12-17, Service bulletin: SERVICE BRAKES. Antilock Brake \(ABS\) Light On. Intermittent Or Implausible Wheel Speed Sensor Signal Diagnostic Trouble Codes \(DTCs\)

JSON: [/v1/bulletins/11033943](/v1/bulletins/11033943)

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