C1274 Low Output Signal of Rear Speed Sensor Left 2

OBD2 Code: C1274

Description: Low output signal of rear speed sensor left 2.

Definition: This code indicates that the vehicle’s onboard diagnostics system has detected a low output signal from the rear left wheel speed sensor. This sensor is responsible for monitoring the rotational speed of the wheel and sending this information to the vehicle’s electronic control unit (ECU) to assist with functions such as anti-lock braking systems (ABS) and traction control.

C1274 – Low output signal of rear speed sensor left 2

Typical severity: Medium

Common Causes

C1274 – Low Output Signal of Rear Speed Sensor Left 2

Common Causes:

• Faulty rear speed sensor left 2
• Corroded or damaged wiring/connectors to the rear speed sensor left 2
• Issues with the ABS control module
• Interference from other electronic components

 

Common Misdiagnosis

OBD2 Code: C1274

Description: Low Output Signal of Rear Speed Sensor Left 2

Common Misdiagnosis: Replacing the speed sensor without checking for wiring issues or connector problems.

 

Common Diagnostic Steps

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OBD2 Code: C1274

Description: Low Output Signal of Rear Speed Sensor Left 2

• Verify the code using an OBD2 scanner and check for any other related codes.
• Inspect the rear left speed sensor and its wiring for physical damage or disconnection.
• Check the sensor connector for corrosion, bent pins, or poor connections.
• Measure the resistance of the speed sensor to ensure it is within manufacturer specifications.
• Test the voltage supply to the speed sensor with a multimeter to confirm proper power delivery.
• Examine the reluctor ring (tone wheel) for damage or debris that may affect signal output.
• If applicable, perform a continuity test on the wiring harness from the sensor to the ABS control module.
• If all tests pass but issue persists, consider replacing the rear left speed sensor.