What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
C121A-00Steering Angle Sensor Not Initialized - Is stored with no Malfunction Indicator Lamp (MIL)C121ASteering Angle Sensor Not Initialized - Stored FaultManufacturer communications
3Original wording in English
RAM
Reported code forms C121A-00
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…
RAM
Reported code forms C121A-00
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).…
RAM
Reported code forms C121A
Brake System Control Module (BSCM) sets Diagnostic Trouble Code (DTC) C121A - Steering Angle Sensor Not Initialized - Stored Fault
Check vehicle applicability
1A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Ram | 1500 | 2025 |
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.