C0242
System
Chassis (ABS / Stability)
Scanner required
Full-system scanner (engine, ABS, SRS, transmission, service resets)

ECM Indicated TCS/VSES Malfunction

Understand C0242, common causes, and the right TOPDON scanner to diagnose it.

Engine control module reported a traction or stability system fault to the ABS module.

Common symptoms

  • Traction control light
  • Reduced engine power on some models

Typical causes

  • Engine misfire affecting torque reduction
  • TCS request circuit fault
  • PCM/EBCM communication issue

What scanner do you need?

Full-system scanner (engine, ABS, SRS, transmission, service resets)

Use live data and freeze frame to confirm the fault before replacing parts. ABS, SRS, and network U-codes usually require a full-system scanner.

Diagnostic tips

  • Record freeze frame data when the code first sets
  • Clear the code only after fixing the root cause
  • Check for related pending codes that point to a common issue
  • Verify battery voltage is above 12.4V before chasing sensor codes

Recommended TOPDON scanners

Frequently asked questions

Can I diagnose C0242 with a basic code reader?
C0242 may set in the engine module, but related diagnostics often benefit from an enhanced or full-system scanner with live data and freeze frame.
Is it safe to drive with C0242?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.