P1201 2018 GMC Sierra Code - Transmission Range Redundant Command Message Counter Incorrect
Quick Answer
The P1201 diagnostic trouble code (DTC) specifically refers to a transmission range redundant command message counter incorrect issue in a 2018 GMC Sierra. Common causes include Faulty transmission range sensor, Wiring or connection issues within the transmission control circuit, Software glitches in the TCM. 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 2018 GMC Sierra indicates Transmission Range Redundant Command Message Counter Incorrect.
- Common causes
- Common causes include Faulty transmission range sensor, Wiring or connection issues within the transmission control circuit, Software glitches in the TCM.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P1201 2018 GMC Sierra Description
The P1201 diagnostic trouble code (DTC) specifically refers to a transmission range redundant command message counter incorrect issue in a 2018 GMC Sierra. This code indicates that the transmission control module (TCM) has detected that the message counter for redundant commands related to the transmission range is not operating as expected. In simpler terms, the TCM is not receiving the correct signals or feedback related to the transmission range, which can lead to various performance issues within the vehicle.
Common Causes of P1201 2018 GMC Sierra
- Faulty transmission range sensor
- Wiring or connection issues within the transmission control circuit
- Software glitches in the TCM
- Malfunctioning TCM module
- Communication errors between control modules
Symptoms of P1201 2018 GMC Sierra
- Delayed or harsh shifting between gears
- Erratic transmission behavior
- Inability to shift into specific gears
- Illumination of the check engine light
- Reduced fuel efficiency
How to Fix P1201 2018 GMC Sierra
- Perform a thorough diagnostic scan to retrieve the exact fault codes and pinpoint the issue.
- Inspect the transmission range sensor and related wiring for any damage or loose connections.
- Test the TCM functionality and reprogram if necessary to correct any software glitches.
- Address any communication errors between control modules by checking and resetting network connections.
- Clear the fault codes, reset the TCM, and perform a test drive to ensure the issue has been resolved.
Cost to Fix P1201 2018 GMC Sierra
The typical repair costs for addressing a P1201 code in a 2018 GMC Sierra can vary depending on the exact cause of the issue and the necessary repairs. In general, the estimated cost for parts and labor to resolve this problem can range from $200 to $600. However, it is important to note that specific diagnosis time and labor rates at auto repair shops can vary significantly based on factors such as location, vehicle make and model, and engine type. It is recommended to check with local auto repair shops for a more accurate estimate based on your specific circumstances.
Need more information about the P1201 2018 GMC Sierra code?
Need more information on how to fix the P1201 2018 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1201 2018 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P1201 2018 GMC Sierra Code
1. What are the common symptoms of OBDII code P1201 in a 2018 GMC Sierra?
- Common symptoms include issues with shifting gears, transmission slippage, decreased fuel efficiency, and the illumination of the Check Engine light.
2. What does the OBDII code P1201 "Transmission Range Redundant Command Message Counter Incorrect" mean for a 2018 GMC Sierra?
- This code indicates a communication error between the transmission control module and the engine control module, specifically related to the transmission range sensor.
3. What are the possible causes of OBDII code P1201 in a 2018 GMC Sierra?
- Possible causes include a faulty transmission range sensor, damaged wiring or connectors in the transmission control circuit, software issues, or a malfunctioning transmission control module.
4. How can I diagnose OBDII code P1201 in my 2018 GMC Sierra?
- Diagnosing this code usually involves using a diagnostic scanner to retrieve the code, checking the transmission range sensor for proper operation, inspecting wiring and connectors for damage, and performing a software update if necessary.
5. Can I continue driving my 2018 GMC Sierra with OBDII code P1201?
- It is not recommended to drive the vehicle with this code present, as it can lead to further transmission problems and potential safety hazards. It is best to address the issue promptly.
6. How can OBDII code P1201 in a 2018 GMC Sierra be repaired?
- Repairing this code typically involves replacing the faulty transmission range sensor, repairing any damaged wiring or connectors, updating the software as needed, or replacing the transmission control module if necessary.
7. Is it possible to reset OBDII code P1201 in a 2018 GMC Sierra without addressing the underlying issue?
- While clearing the code temporarily may turn off the Check Engine light, the underlying issue causing the code will persist unless properly diagnosed and repaired.
8. Are there any preventive measures to avoid OBDII code P1201 in a 2018 GMC Sierra?
- Regular maintenance checks, such as inspecting and cleaning connectors, ensuring proper transmission fluid levels, and promptly addressing any transmission-related symptoms, can help prevent this code from occurring.
9. How long does it typically take to repair OBDII code P1201 in a 2018 GMC Sierra?
- The repair time can vary depending on the exact cause of the code and the availability of parts. It is recommended to consult a professional mechanic for an accurate estimate.
10. Can a DIY enthusiast with basic automotive knowledge repair OBDII code P1201 in a 2018 GMC Sierra?
- While some aspects of diagnosing and repairing this code may be within reach for DIY enthusiasts, it is recommended to consult a professional mechanic for a comprehensive and accurate repair.
Discuss the causes and fixes for P1201 2018 GMC Sierra OBDII Code
Code P1201 2018 GMC Sierra comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.