P155B 2017 GMC Sierra Code - Cruise Control Set/Coast Switch 2 Circuit
Quick Answer
The diagnostic trouble code P155B in a 2017 GMC Sierra relates to the Cruise Control Set/Coast Switch 2 Circuit. Common causes include Malfunctioning set/coast switch, Faulty wiring or connections in the cruise control circuit, Corrosion or damage to the cruise control components. 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
- P155B 2017 GMC Sierra indicates Cruise Control Set/Coast Switch 2 Circuit.
- Common causes
- Common causes include Malfunctioning set/coast switch, Faulty wiring or connections in the cruise control circuit, Corrosion or damage to the cruise control components.
- 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 P155B 2017 GMC Sierra Description
The diagnostic trouble code P155B in a 2017 GMC Sierra relates to the Cruise Control Set/Coast Switch 2 Circuit. This code indicates a problem with the circuit that controls the cruise control system's set and coast functions. The cruise control system allows the driver to set a desired speed for the vehicle to maintain automatically, reducing the need for constant throttle input. When this code is triggered, it means that there is a malfunction in the circuit responsible for controlling these specific functions.
Common Causes of P155B 2017 GMC Sierra
- Malfunctioning set/coast switch.
- Faulty wiring or connections in the cruise control circuit.
- Corrosion or damage to the cruise control components.
- Issues with the cruise control module.
- Electrical problems within the vehicle's system.
Symptoms of P155B 2017 GMC Sierra
- Inability to set or adjust cruise control speed.
- Cruise control system not engaging at all.
- Erratic behavior of the cruise control system.
- Illumination of the cruise control warning light on the dashboard.
- Possible loss of fuel efficiency on highways due to the inability to maintain a steady speed.
How to Fix P155B 2017 GMC Sierra
- Begin by conducting a thorough diagnosis of the cruise control system to pinpoint the exact cause of the issue.
- Inspect the set/coast switch and its connections for any signs of damage or corrosion. Replace the switch if necessary.
- Check the wiring harness and connections for any breaks or loose connections. Repair or replace damaged wiring as needed.
- Test the cruise control module to ensure it is functioning correctly. Replace the module if it is determined to be faulty.
- Clear the diagnostic trouble codes from the vehicle's system and test the cruise control function to verify that the issue has been resolved.
Cost to Fix P155B 2017 GMC Sierra
The cost of repairing the Cruise Control Set/Coast Switch 2 Circuit issue can vary depending on the specific cause of the problem and the labor rates in your area. Typically, parts for this repair can range from $50 to $200, while labor costs can vary from $100 to $300 or more. As mentioned, labor rates at auto repair shops can fluctuate based on location and other factors, so it's advisable to obtain quotes from multiple sources for a more accurate estimate.
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Frequently Asked Questions about P155B 2017 GMC Sierra Code
1. What does the OBDII code P155B mean on a 2017 GMC Sierra?
The P155B code indicates an issue with the Cruise Control Set/Coast Switch 2 Circuit, which is part of the cruise control system.
2. What are the symptoms of the P155B code on a 2017 GMC Sierra?
Common symptoms include the cruise control not functioning, the cruise control light not illuminating, or intermittent cruise control operation.
3. What causes the P155B code to appear?
Possible causes include a faulty cruise control switch, damaged wiring or connectors in the circuit, or a problem with the ECM (engine control module).
4. How can I fix the P155B code on my GMC Sierra?
Start by inspecting the cruise control switch and its wiring for damage or loose connections. If no issues are found, the switch itself may need to be replaced or the ECM may require reprogramming.
5. Can I still drive my GMC Sierra with the P155B code?
Yes, you can drive the vehicle, but the cruise control system may not function properly until the issue is repaired.
6. How do I diagnose the P155B code on a 2017 GMC Sierra?
Use an OBDII scanner to confirm the code, then perform a visual inspection of the cruise control switch, wiring, and connectors. Test the switch with a multimeter and check for continuity in the circuit.
7. Is the P155B code related to other systems in the vehicle?
The P155B code specifically pertains to the cruise control system and does not directly affect other systems, though it shares wiring with other components that could also be impacted.
8. How much does it cost to repair the P155B code?
Repair costs can vary but typically range from $100 to $300, depending on whether the issue lies with the switch, wiring, or ECM.
9. Can a faulty brake switch cause the P155B code?
While uncommon, a faulty brake switch could interfere with cruise control operation and should be checked if no issues are found with the set/coast switch or wiring.
10. Will clearing the P155B code with a scanner fix the issue?
Clearing the code may temporarily turn off the check engine light, but the issue will likely return unless the underlying problem is resolved.
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