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P1201 GMC Code - Transmission Range Redundant Command Message Counter Incorrect

Quick Answer

The P1201 GMC code indicates that the transmission range redundant command message counter is incorrect. Common causes include Faulty transmission range sensor, Wiring or connector issues, Transmission control module malfunction. 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
P1201 GMC indicates Transmission Range Redundant Command Message Counter Incorrect.
Common causes
Common causes include Faulty transmission range sensor, Wiring or connector issues, Transmission control module malfunction.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1201 GMC Description

The P1201 GMC code indicates that the transmission range redundant command message counter is incorrect. In simpler terms, this means that there is a discrepancy between the commands being sent to the transmission range sensor and the actual position of the transmission. This can lead to issues with shifting gears, as the transmission may not be in the correct range as indicated by the vehicle's computer system. This can result in poor performance, rough shifting, and even potential safety hazards if not addressed promptly.

OBDII Code P1201 GMC - Transmission Range Redundant Command Message Counter Incorrect
P1201 GMC Code - Transmission Range Redundant Command Message Counter Incorrect

Common Causes of P1201 GMC

  1. Faulty transmission range sensor
  2. Wiring or connector issues
  3. Transmission control module malfunction
  4. Low transmission fluid levels
  5. Software or programming errors

Symptoms of P1201 GMC

  1. Rough or erratic shifting
  2. Delayed or harsh gear changes
  3. Transmission slipping or not engaging properly
  4. Check Engine Light illuminated
  5. Reduced fuel efficiency

How to Fix P1201 GMC

  1. Diagnose the issue using a scan tool to retrieve the specific fault codes and data related to the transmission range sensor.
  2. Inspect the transmission range sensor, wiring, and connectors for any signs of damage or corrosion. Replace as necessary.
  3. Check and top off transmission fluid levels to ensure proper operation.
  4. Reset the transmission control module and perform a relearn procedure to recalibrate the sensor.
  5. Test drive the vehicle to confirm that the issue has been resolved and clear any remaining fault codes from the system.

Cost to Fix P1201 GMC

The typical repair costs for addressing a P1201 GMC code can vary depending on the specific cause of the issue. In general, you can expect to pay between $200 and $500 for parts and labor. This estimate includes the cost of any necessary replacement parts, diagnostic time, and the labor required to complete the repair. Keep in mind that prices can vary based on your location, the make and model of your vehicle, and the rates charged by the auto repair shop you choose. It's always a good idea to get a few quotes from different shops to ensure you're getting a fair price for the repair.

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Information for Specific GMC Models

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.

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