AutoCodes – GMC – C1207 GMC

C1207 GMC Code - Left Rear Wheel Speed Sensor Circuit Range Performance

Quick Answer

As the wheel is rotated, the speed sensor produces an AC voltage that increases with wheel speed. Common causes include Faulty Left Rear Wheel Speed Sensor, Left Rear Wheel Speed Sensor harness is open or shorted, Left Rear Wheel Speed Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
C1207 GMC indicates Left Rear Wheel Speed Sensor Circuit Range Performance.
Common causes
Common causes include Faulty Left Rear Wheel Speed Sensor, Left Rear Wheel Speed Sensor harness is open or shorted, Left Rear Wheel Speed Sensor circuit poor electrical connection.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code Popularity 509
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Nov 19, 2023
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Code C1207 GMC Description

As the wheel is rotated, the speed sensor produces an AC voltage that increases with wheel speed. The Electronic Brake Control Module (EBCM) uses the frequency of the AC signal to calculate the wheel speed. The speed sensor is connected to the EBCM by a twisted pair of wires. Twisting reduces noise susceptibility that may cause a Diagnostic Trouble Code (DTC) to be set. The DTC will be set when the left rear wheel speed is accelerating or decelerating beyond reasonable limits.
OBDII Code C1207 GMC - Left Rear Wheel Speed Sensor Circuit Range Performance - AutoCodes.com
C1207 GMC Code - Left Rear Wheel Speed Sensor Circuit Range Performance

What are the Possible Causes of the DTC C1207 GMC?

  • Faulty Left Rear Wheel Speed Sensor
  • Left Rear Wheel Speed Sensor harness is open or shorted
  • Left Rear Wheel Speed Sensor circuit poor electrical connection
  • Faulty Electronic Brake Control Module (EBCM)

How to Fix the DTC C1207 GMC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C1207 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about C1207 GMC Code

1. What does the OBDII code C1207 mean for a GMC vehicle?

C1207 indicates an issue with the Left Rear Wheel Speed Sensor Circuit, specifically related to its range or performance.

2. What are common symptoms of the C1207 code on a GMC?

Common symptoms include ABS warning light activation, traction control issues, unresponsive ABS system, or erratic braking behavior.

3. What causes the C1207 code to appear on a GMC?

Typical causes include a faulty left rear wheel speed sensor, damaged wiring or connectors, corrosion in the circuit, or issues with the ABS module.

4. Can I continue driving with the C1207 code on my GMC?

While the vehicle may still be drivable, the ABS and traction control systems may not function properly, which can compromise safety in certain conditions.

5. How do I diagnose the C1207 code on my GMC?

Diagnosis involves inspecting the left rear wheel speed sensor, checking for damaged wiring or corroded connectors, and testing the sensor's resistance with a multimeter.

6. How do I fix the C1207 code on a GMC vehicle?

Repairs may include replacing the faulty wheel speed sensor, repairing or replacing damaged wiring, cleaning corroded connectors, or reprogramming the ABS module if needed.

7. How much does it cost to fix the C1207 code on a GMC?

Repair costs vary but typically range from $100 to $300, depending on whether the sensor or wiring needs replacement.

8. Can a bad wheel bearing cause the C1207 code on a GMC?

Yes, a worn or damaged wheel bearing can cause incorrect readings from the wheel speed sensor, leading to the C1207 code.

9. Will clearing the C1207 code fix the problem?

Clearing the code with a scan tool will remove the warning temporarily, but the underlying issue must be resolved to prevent it from returning.

10. What tools are needed to fix the C1207 code on a GMC?

Common tools include a diagnostic scan tool, multimeter, jack and jack stands, and basic hand tools for removing and replacing the sensor or wiring.

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