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C1274 Low Output Signal of Rear Speed Sensor Left

OBD2 Code: C1274

Description: Low output signal from the rear speed sensor on the left side.

Definition: This code indicates that the Electronic Control Unit (ECU) has detected a low or no signal from the rear left wheel speed sensor. The sensor is responsible for providing data to the vehicle’s anti-lock braking system (ABS) and traction control system, which helps in maintaining stability and control during driving.

C1274 – Low Output Signal of Rear Speed Sensor Left

Typical Severity: Moderate

Common Causes

C1274 – Low Output Signal of Rear Speed Sensor Left

Common Causes:

• Faulty rear speed sensor left
• Wiring or connector issues in the circuit of the rear speed sensor left
• Corrosion or poor connection at the sensor or related components
• Issues with the ABS control module
• Vehicle speed sensor malfunction

 

Common Misdiagnosis

OBD2 Code: C1274

Description: Low Output Signal of Rear Speed Sensor Left

Common Misdiagnosis:

• Faulty wheel speed sensor when the issue is actually a damaged wiring harness.
• Assuming the problem is with the ABS module instead of a dirty or misaligned sensor.
• Mistaking a mechanical brake issue for an electronic sensor fault.

 

Common Diagnostic Steps

• Code: C1274
• Description: Low Output Signal of Rear Speed Sensor Left
• Common Diagnostic Steps:
• Inspect the rear left speed sensor for physical damage or debris.
• Check the wiring and connectors for corrosion, damage, or loose connections.
• Measure the resistance of the rear left speed sensor to ensure it is within specifications.
• Use a scan tool to monitor the wheel speed sensor data while driving to check for irregularities.
• If available, perform an oscilloscope test on the sensor signal to verify proper waveform output.
• Inspect and test the ABS module if all other components are functioning correctly.
• Replace the rear left speed sensor if found faulty after testing.