P1201 2017 GMC Sierra Code - Transmission Range Redundant Command Message Counter Incorrect
Quick Answer
The P1201 diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates that the Transmission Range Redundant Command Message Counter is Incorrect. Common causes include Faulty transmission range sensor, Wiring issues or shorts in the transmission control circuit, Malfunctioning TCM or PCM. 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 2017 GMC Sierra indicates Transmission Range Redundant Command Message Counter Incorrect.
- Common causes
- Common causes include Faulty transmission range sensor, Wiring issues or shorts in the transmission control circuit, Malfunctioning TCM or PCM.
- 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 2017 GMC Sierra Description
The P1201 diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates that the Transmission Range Redundant Command Message Counter is Incorrect. This code typically points to a communication issue within the transmission control module (TCM) or the powertrain control module (PCM). The TCM and PCM rely on various sensors and switches to determine the correct gear position and ensure smooth operation of the transmission. When the message counter is incorrect, it means that the TCM and PCM are not receiving consistent data regarding the transmission range, leading to potential performance issues.
Common Causes of P1201 2017 GMC Sierra
- Faulty transmission range sensor
- Wiring issues or shorts in the transmission control circuit
- Malfunctioning TCM or PCM
- Corrosion or poor connections in the communication network
- Software glitches or programming errors
Symptoms of P1201 2017 GMC Sierra
- Erratic shifting
- Harsh engagement when shifting gears
- Limp mode activation
- Failure to shift gears
- Check engine light illuminated
How to Fix P1201 2017 GMC Sierra
- Begin by conducting a thorough inspection of the transmission range sensor and its wiring. Replace any damaged components as needed.
- Check the transmission control circuit for any shorts or open circuits. Repair or replace wiring as necessary.
- Perform a diagnostic scan to identify any fault codes stored in the TCM or PCM. Clear codes and retest the vehicle.
- If the issue persists, consider reprogramming the TCM or PCM with the latest software updates from the manufacturer.
- Test drive the vehicle to ensure that the transmission is shifting smoothly and that the P1201 code does not return.
Cost to Fix P1201 2017 GMC Sierra
The typical repair costs for addressing a P1201 code on a 2017 GMC Sierra can range from $200 to $500, depending on the extent of the repairs needed. This estimate includes the cost of parts such as sensors or wiring harnesses, as well as labor charges. However, it's important to note that actual repair costs can vary based on factors such as location, vehicle make and model, and the specific diagnosis time required by the auto repair shop. It's recommended to obtain quotes from multiple shops to get a more accurate estimate for this repair.
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