C1412 Rear Speed Sensor Left Performance

OBD2 Code: C1412

Description: Rear speed sensor left performance issue.

Definition: This code indicates a problem with the performance of the rear left wheel speed sensor. The sensor may not be providing accurate data to the vehicle’s control module, which can affect functions such as ABS and traction control.

C1412 – Rear Speed Sensor Left Performance

Severity: Moderate

Common Causes

C1412 Rear Speed Sensor Left Performance

Common Causes:

• Faulty rear speed sensor left
• Corroded or damaged wiring/connectors to the rear speed sensor left
• Interference from other electronic components affecting the rear speed sensor left signal
• Wheel bearing issues causing erratic readings from the rear speed sensor left

 

Common Misdiagnosis

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OBD2 Code: C1412

Description: Rear Speed Sensor Left Performance

Common Misdiagnosis: Faulty wiring or connectors are often misdiagnosed as a defective speed sensor.

 

Common Diagnostic Steps

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OBD2 Code: C1412

Description: Rear Speed Sensor Left Performance

• Inspect the rear left speed sensor for any visible damage or corrosion.
• Check the wiring and connectors leading to the rear left speed sensor for any signs of wear, damage, or disconnection.
• Use a multimeter to test the resistance of the rear left speed sensor. Compare it with manufacturer specifications.
• Examine the reluctor ring (tone wheel) for any damage or debris that might affect sensor readings.
• Perform a diagnostic scan to check for additional codes that may indicate related issues.
• If equipped, use an oscilloscope to observe the waveform output from the rear left speed sensor while rotating the wheel.
• Verify proper installation and alignment of the rear left speed sensor.
• If all checks are normal, consider replacing the rear left speed sensor as a last resort.