C121C fault code: what it means

C121C: Torque request signal denied: the engine computer refused the ABS/ESC request to cut torque. ESC/traction lights may show; usually an engine fault is the root cause.

Chassis (brakes, steering, suspension) · Minor

Usual causes, most likely first

engine fault stored in PCM
electronic throttle fault
ABS module
PCM

C121C by make

Jeep

Torque request signal denied: the engine computer refused the ABS/ESC request to cut torque. ESC/traction lights may show; usually an engine fault is the root cause.

Usual causes: engine fault stored in PCM; electronic throttle fault; ABS module; PCM

What the repair usually costs

ABS pump / control module replacement (reman exchange or new)NZ$850–NZ$3,210 · A$780–A$2,880
Electronic throttle body replaceNZ$470–NZ$1,290 · A$440–A$1,190

Not sure what C121C means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.