P1201 2015 GMC Sierra Code - Transmission Range Redundant Command Message Counter Incorrect
Quick Answer
The P1201 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates that the Transmission Range Redundant Command Message Counter is incorrect. Common causes include Faulty Transmission Range Sensor (TRS), Damaged wiring or connectors in the transmission range circuit, Malfunctioning Transmission Control Module (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 2015 GMC Sierra indicates Transmission Range Redundant Command Message Counter Incorrect.
- Common causes
- Common causes include Faulty Transmission Range Sensor (TRS), Damaged wiring or connectors in the transmission range circuit, Malfunctioning Transmission Control Module (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.
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Code P1201 2015 GMC Sierra Description
The P1201 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates that the Transmission Range Redundant Command Message Counter is incorrect. This error occurs when the Transmission Control Module (TCM) receives a signal from the Transmission Range Sensor (TRS) that does not match the expected values. The TRS is responsible for indicating the gear position of the transmission to the TCM, allowing it to control shifting and other transmission functions. When the TCM detects that the message counter is incorrect, it can lead to issues in transmission operation and overall vehicle performance.
Common Causes of P1201 2015 GMC Sierra
- Faulty Transmission Range Sensor (TRS)
- Damaged wiring or connectors in the transmission range circuit
- Malfunctioning Transmission Control Module (TCM)
- Software issues within the TCM programming
Symptoms of P1201 2015 GMC Sierra
- Erratic shifting
- Harsh transitions between gears
- Hesitation during acceleration
- Stalling
- Check Engine Light illuminated
How to Fix P1201 2015 GMC Sierra
- Perform a comprehensive diagnostic scan to retrieve the fault codes and pinpoint the exact cause of the issue.
- Inspect the TRS, wiring, and connectors for any visible damage or wear. Replace any faulty components.
- Test the TCM for functionality and reprogram if necessary to address any software issues.
- Clear the fault codes and perform a test drive to ensure the issue has been resolved.
- If the problem persists, consult a professional mechanic for further diagnosis and repair.
Cost to Fix P1201 2015 GMC Sierra
The typical repair costs for addressing a P1201 code in a 2015 GMC Sierra can range from $200 to $500, including parts and labor. However, it is essential to note that specific diagnosis time and labor rates at auto repair shops can vary based on location, vehicle make and model, and engine type. Most shops charge between $80 and $150 per hour, with rates potentially higher at dealerships or metropolitan areas and lower at independent shops. It is advisable to check local rates for a more accurate estimate.
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