C1176: Left Rear Wheel Speed Sensor Open Circuit
The C1176 code indicates an open circuit in the left rear wheel speed sensor circuit. This sensor, also known as the ABS or wheel speed sensor, generates an AC voltage signal proportional to wheel rotation. An open circuit means there is a break in the wiring between the sensor and the ABS/stability control module, preventing signal transmission. The module detects this fault when it receives no signal at all, distinguishing it from an erratic or out-of-range signal.
1. Commonly Affected Makes
2. Most Common Causes
- Damaged or worn left rear wheel speed sensor
- Open or broken wiring in the left rear sensor harness
- Corroded, oxidized, or disconnected sensor connector
- Faulty reluctor ring (tone ring) on the left rear wheel
- Harness damage from rubbing against suspension or steering components
3. Symptoms You Will Notice
- ABS warning light illuminated
- Traction or stability control warning light on
- Possible loss of ABS function
- Speedometer may not work correctly
4. Step-by-Step Diagnosis
Scan for additional codes and verify C1176 is present
Visually inspect the left rear wheel speed sensor wiring and connector for damage, corrosion, or disconnection
Check the sensor resistance and compare to specifications (typically 1-2 kΩ)
Inspect the reluctor ring for cracks, missing teeth, or debris
Test the sensor signal output by spinning the wheel and measuring AC voltage
5. Frequently Asked Questions
Is it safe to drive?▼
You can drive, but ABS and stability control will be disabled. Braking normally is still possible, but avoid emergency maneuvers. Have it repaired soon.
How much does it cost to fix?▼
Typically $150 to $400 for parts and labor, depending on whether the sensor or wiring needs replacement.