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C121A · Manufacturer communications

A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.

C121A ← What does this code mean?

3 Results

08-305-26 ↗

RAM · 2026-08-01

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.

08-237-26 ↗

RAM · 2026-06-11

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.

S2408000059 ↗

RAM · 2024-06-12

Brake System Control Module (BSCM) sets Diagnostic Trouble Code (DTC) C121A - Steering Angle Sensor Not Initialized - Stored Fault