C0070
System
Chassis (ABS / Stability)
Scanner required
Full-system scanner (engine, ABS, SRS, transmission, service resets)

Rear Wheel Speed Sensor Correlation

Understand C0070, common causes, and the right TOPDON scanner to diagnose it.

ABS module detected mismatched rear wheel speed readings — one rear sensor may read differently from the other.

Common symptoms

  • ABS light
  • Traction control activation on straight road
  • False stability intervention

Typical causes

  • One rear sensor failing
  • Different tire sizes on rear axle
  • Tone ring damage one side
  • Rear bearing play

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 C0070 with a basic code reader?
C0070 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 C0070?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.