C121C on Chrysler
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 Chrysler. For what C121C means, the ranked causes and the test order, see the C121C guide.
What's different on Chrysler
ChryslerYour car
2017 · Pacifica
Supported by vehicle dataFCA bulletin 18-057-16: C121C-00 from a PCM calibration conflict, fixed by a PCM reflash. Whether it is still current is not verified.
2008–2010 · Town and Country
Supported by vehicle dataOwners report the van shutting down while driving with C121C stored; one dealer found only C121C.
18-057-16Status unverified
Powertrain diagnostic and system enhancements (C121C-00 torque request signal denied)
2017pacifica · issued · NHTSA 10181480
C121C-00 in the ABS module is caused by a PCM calibration that conflicts with the ABS module programming; reprogramming the PCM corrects it.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.
Sources and review
- Chrysler 18-057-16: 3.6L powertrain diagnostic and system enhancements (C121C-00 torque request signal denied)
- NHTSA complaint 11193222: 2010 Chrysler Town and Country, dealer code C121C
- 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