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C0037
System
Chassis (ABS / Stability)
Scanner required
Full-system scanner (engine, ABS, SRS, transmission, service resets)

Left Rear Wheel Speed Sensor Circuit Low Input

Understand C0037, common causes, and the right TOPDON scanner to diagnose it.

LR wheel speed sensor circuit low.

Common symptoms

  • ABS light on
  • Stability control disabled

Typical causes

  • LR sensor failure
  • Rear harness damage
  • Tone ring debris

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

What does C0037 mean?
C0037 indicates left rear wheel speed sensor circuit low input. LR wheel speed sensor circuit low.
Can I diagnose C0037 with a basic code reader?
C0037 may set in the engine module, but related diagnostics often benefit from an enhanced or full-system scanner with live data and freeze frame.
Which TOPDON scanner do I need for C0037?
Full-system scanner (engine, ABS, SRS, transmission, service resets) See recommended tools on this page.
Is it safe to drive with C0037?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.