C0242PCM Indicated Traction Control Malfunction
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- C0242 is a GM brake module code that the accessible J2012 lists do not contain. The Saab 9-5 and 9-4X of 2011 describe it as Powertrain Control Module Indicated Traction Control Malfunction, and the GM bulletin PIC4740C for the 2007 Cadillac STS calls it ECM Indicated TCS Malfunction. During traction control the brake module asks the engine module over the data bus for less torque. When the engine module holds certain faults of its own, it replies that it cannot cut torque, and the brake module stores C0242. Traction and stability control then stay off for the ignition cycle and their lamp comes on. The real fault sits in the engine or transmission module, so its codes are read first; in PIC4740C a loose transmission connector X1 was the cause.
- What you may notice
- Traction or stability control lamp on, systems disabled
- Check engine lamp or reduced engine power from the engine side fault
- Likely causes
- LikelyStored fault in the engine control module that blocks torque reduction
- PossibleLoose or poorly seated terminals at the transmission connector (GM PIC4740C)
- RareFaulty engine control module, rarely the brake module
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.