C121C on Ram
Torque request signal denied, stored in the ABS module (Chrysler, Jeep, Ram)
Severity: Inspect soon
The ESC warning light comes on with this code. FCA's owner's manual says an ESC light that stays on means a malfunction in the stability control system and to see a dealer as soon as possible. Stability and traction control may not work, and the engine fault behind the code can cause power loss.
It gets more serious if:
- Stop: The engine stalls, shuts off or loses power while driving. Owners report Town and Country minivans shutting down on the road and Rams losing power while towing with this code. Pull over safely and have it diagnosed before driving on.
This page covers only what differs on Ram. For what C121C means, the ranked causes and the test order, see the C121C guide.
What's different on Ram
RamYour car
2021–2023 · 1500
Supported by vehicle dataOwners report C121C with loss of power, alongside turbo boost or throttle codes.
Sources and review
- NHTSA complaint 11690166: 2021 Ram 1500, C121C-00 with P00AF-00
- Owner complaints mentioning C121C on Chrysler, Jeep, Dodge and Ram vehicles
- 2022 Ram 2500/3500 Owner's Manual: ESC activation/malfunction indicator light
- Last reviewed
- Written by
- Saurabh K.
- Editorial review
- Pending
- Technician review
- Technician review pending
This page explains what a code usually means; it is not a substitute for a professional inspection. How we source and review · Report an error