P155B 2018 GMC Sierra Code - Cruise Control Set/Coast Switch 2 Circuit
Quick Answer
The P155B diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the Cruise Control Set/Coast Switch 2 Circuit. Common causes include Faulty cruise control set/coast switch, Wiring issues in the cruise control circuit, Malfunctioning cruise control module. 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 2018 GMC Sierra indicates Cruise Control Set/Coast Switch 2 Circuit.
- Common causes
- Common causes include Faulty cruise control set/coast switch, Wiring issues in the cruise control circuit, Malfunctioning cruise control module.
- 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 2018 GMC Sierra Description
The P155B diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the Cruise Control Set/Coast Switch 2 Circuit. This code indicates that there is a malfunction in the circuit responsible for controlling the cruise control set and coast functions in the vehicle. The cruise control system allows the driver to set a desired speed for the vehicle to maintain automatically, which can be especially useful for long highway drives. The coast function allows the driver to reduce the set speed without deactivating the cruise control entirely.
Common Causes of P155B 2018 GMC Sierra
- Faulty cruise control set/coast switch.
- Wiring issues in the cruise control circuit.
- Malfunctioning cruise control module.
- Electrical problems in the vehicle's system.
- Corrosion or damage to connectors in the cruise control circuit.
Symptoms of P155B 2018 GMC Sierra
- Inability to set a desired speed using the cruise control system.
- The cruise control system not maintaining a set speed.
- Difficulty adjusting the set speed using the coast function.
- Illumination of the check engine light on the dashboard.
How to Fix P155B 2018 GMC Sierra
- Begin by conducting a thorough inspection of the cruise control set/coast switch and its wiring to identify any visible damage or faults.
- Test the cruise control system using a diagnostic tool to pinpoint the exact source of the issue.
- Replace the faulty cruise control set/coast switch if necessary.
- Repair any damaged wiring or connectors in the cruise control circuit.
- Clear the DTC from the vehicle's computer system and test the cruise control system to ensure proper functionality.
Cost to Fix P155B 2018 GMC Sierra
The typical repair costs for addressing the P155B code on a 2018 GMC Sierra can range from $150 to $400, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate. Keep in mind that rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more competitive pricing.
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Frequently Asked Questions about P155B 2018 GMC Sierra Code
What does the OBDII code P155B mean on a 2018 GMC Sierra?
P155B indicates an issue with the Cruise Control Set/Coast Switch 2 Circuit, which monitors signals related to cruise control operation.
What are the common symptoms of code P155B in a 2018 GMC Sierra?
Symptoms may include cruise control not engaging, intermittent functionality, or the cruise control system turning off unexpectedly.
What causes the P155B code to appear on a 2018 GMC Sierra?
Common causes include a faulty cruise control switch, damaged wiring or connectors in the circuit, or issues with the vehicle's body control module (BCM).
How can I diagnose the P155B code on a 2018 GMC Sierra?
Check the wiring and connectors for damage, test the cruise control switch for proper operation, and use a diagnostic scan tool to monitor circuit signals.
Can I still drive my 2018 GMC Sierra with the P155B code?
Yes, you can drive the vehicle, but the cruise control system may not function properly, which could reduce convenience on longer drives.
How do I fix the P155B code on a 2018 GMC Sierra?
Repairs may involve replacing the cruise control switch, repairing or replacing damaged wiring, or reprogramming the BCM if necessary.
How much does it cost to repair the P155B code in a 2018 GMC Sierra?
Repair costs can vary, but replacing a cruise control switch typically costs $100-$300, while wiring repairs may range from $50-$150. BCM reprogramming can cost $150-$300.
Is the P155B code a common issue for the 2018 GMC Sierra?
This code is not very common but may occur in vehicles with frequently used or worn cruise control systems.
Can a faulty cruise control switch cause the P155B code?
Yes, a malfunctioning cruise control switch is a primary cause of code P155B and should be tested during diagnosis.
Do I need professional help to fix the P155B code in my 2018 GMC Sierra?
If you're comfortable with electrical diagnostics and repairs, you can attempt to fix it yourself; otherwise, seek assistance from a qualified mechanic.
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