Left Rear Wheel Speed Sensor Circuit Range/Performance
What does C0070 mean?
The C0070 code means the vehicle's onboard diagnostic system has detected: Left Rear Wheel Speed Sensor Circuit Range/Performance. This is a critical severity code.
Common Symptoms
- ABS light on
- Traction control inoperative
- ABS engages prematurely during braking
- Rear brake pulsation at low speed
- Stability control warning light on
Probable Causes (Ranked by Likelihood)
- Metallic debris on rear wheel speed sensor Very High
- Sensor air gap out of specification High
- Rear tone ring cracked or missing teeth Moderate
- Intermittent wiring fault in rear harness Moderate
- Rear wheel bearing wear affecting sensor gap Low
Step-by-Step Diagnostic Procedure
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Scan for codes and compare all four wheel speed sensor readings in live data
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Remove left rear sensor and clean the magnetic tip of debris
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Inspect rear tone ring for physical damage
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Check wiring along the rear axle and frame for chafing or corrosion
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Test left rear wheel bearing for excessive play
Frequently Asked Questions
Why does this code appear more often on trucks?
Trucks and SUVs have longer wiring runs to the rear sensors and the rear axle is more exposed to road debris, mud, and salt. This increases the chance of contamination and wiring damage.
Can I drive on the highway with a C0070 code?
You can drive on the highway, but your ABS and traction control will be inactive. Use extra caution in wet or icy conditions and maintain greater following distance.
Will a C0070 code cause my vehicle to fail inspection?
In many states, a lit ABS warning light will cause a vehicle to fail inspection. Check your state's specific inspection requirements, as some states do not check ABS functionality.