P155D 2017 GMC Sierra Code - Hill Descent Control Message Counter Incorrect
Quick Answer
The P155D diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates that the Hill Descent Control Message Counter is incorrect. Common causes include Faulty HDC control module, Sensor malfunction related to HDC system, Wiring issues or electrical connections. 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
- P155D 2017 GMC Sierra indicates Hill Descent Control Message Counter Incorrect.
- Common causes
- Common causes include Faulty HDC control module, Sensor malfunction related to HDC system, Wiring issues or electrical connections.
- 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 P155D 2017 GMC Sierra Description
The P155D diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates that the Hill Descent Control Message Counter is incorrect. Hill Descent Control (HDC) is a feature that helps drivers navigate steep descents by automatically controlling the vehicle's speed. When the message counter is incorrect, it means that the system is not accurately tracking or communicating the number of times the HDC has been activated or used.
Common Causes of P155D 2017 GMC Sierra
- Faulty HDC control module
- Sensor malfunction related to HDC system
- Wiring issues or electrical connections
- Software glitches or communication errors within the vehicle's control modules
- Physical damage to components of the HDC system
Symptoms of P155D 2017 GMC Sierra
- HDC system not engaging when driving on steep descents
- Incorrect or inconsistent messages displayed on the dashboard related to HDC
- Loss of control or stability when driving downhill
- Illumination of the HDC warning light on the instrument cluster
- Reduced braking effectiveness during downhill driving
How to Fix P155D 2017 GMC Sierra
- Begin by conducting a thorough diagnostic scan of the vehicle's onboard computer to retrieve the specific trouble codes and pinpoint the issue with the HDC message counter.
- Inspect the HDC control module, sensors, wiring, and connections for any signs of damage or malfunction. Replace or repair any faulty components as needed.
- Check for software updates or recalibrations that may be available from the manufacturer to address any glitches or communication errors within the control modules.
- Reset the HDC message counter and recalibrate the system to ensure accurate tracking of HDC activations.
- Test drive the vehicle to verify that the HDC system is functioning correctly and that the message counter is now accurate.
Cost to Fix P155D 2017 GMC Sierra
The typical repair costs for addressing a P155D DTC related to the Hill Descent Control Message Counter on a 2017 GMC Sierra can vary depending on the specific cause of the issue. On average, the repair costs for this type of problem could range from $200 to $500, including parts and labor. However, it's important to note that diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's recommended to check with local repair shops for a more precise estimate based on the specific circumstances.
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Frequently Asked Questions about P155D 2017 GMC Sierra Code
1. What does the OBDII code P155D mean on a 2017 GMC Sierra?
P155D indicates "Hill Descent Control Message Counter Incorrect," suggesting a communication issue between the Hill Descent Control (HDC) system and other vehicle modules.
2. What are the common symptoms of code P155D in a 2017 GMC Sierra?
The most common symptoms include an illuminated check engine light, a malfunctioning Hill Descent Control system, or a "Service Hill Descent Control" message on the dashboard.
3. What causes the P155D code to appear in a 2017 GMC Sierra?
This code is usually caused by faulty communication between the Hill Descent Control module and the powertrain control module (PCM), damaged wiring, or a malfunctioning control module.
4. Can I still drive my 2017 GMC Sierra with the P155D code?
Yes, you can typically drive the vehicle, but the Hill Descent Control system may not function properly, which could be a safety concern on steep or slippery terrain.
5. How can I diagnose the P155D code on a 2017 GMC Sierra?
Start by scanning the vehicle with an OBDII scanner to confirm the code and check for other related codes. Then, inspect the wiring and connectors related to the Hill Descent Control module.
6. What are the repair options for the P155D code in a 2017 GMC Sierra?
Repairs may involve fixing or replacing damaged wiring, reconnecting loose connectors, or reprogramming or replacing the Hill Descent Control module.
7. How much does it cost to fix a P155D code on a 2017 GMC Sierra?
Repair costs can vary widely, from $50 for simple wiring fixes to $500 or more if a module replacement is necessary.
8. Could a weak battery cause the P155D code on a 2017 GMC Sierra?
Yes, low voltage or a weak battery can cause communication errors that might trigger the P155D code.
9. Is the P155D code related to other systems in the 2017 GMC Sierra?
Yes, the Hill Descent Control system communicates with the ABS, traction control, and powertrain control systems, so issues in those systems could potentially contribute to this code.
10. Can clearing the code fix the P155D issue in a 2017 GMC Sierra?
Clearing the code may temporarily remove it, but the underlying issue must be addressed to prevent the code from returning.
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