P155B 2014 GMC Sierra Code - Cruise Control Set/Coast Switch 2 Circuit
Quick Answer
The P155B diagnostic trouble code (DTC) for a 2014 GMC Sierra relates to the Cruise Control Set/Coast Switch 2 Circuit. Common causes include Faulty cruise control switches, Damaged wiring or connectors 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 2014 GMC Sierra indicates Cruise Control Set/Coast Switch 2 Circuit.
- Common causes
- Common causes include Faulty cruise control switches, Damaged wiring or connectors 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 2014 GMC Sierra Description
The P155B diagnostic trouble code (DTC) for a 2014 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 particularly useful for long highway drives. The coast function allows the driver to reduce the set speed without disengaging the cruise control entirely.
Common Causes of P155B 2014 GMC Sierra
- Faulty cruise control switches.
- Damaged wiring or connectors in the cruise control circuit.
- Malfunctioning cruise control module.
- Issues with the vehicle's speed sensor.
- Electronic control unit (ECU) software glitches.
Symptoms of P155B 2014 GMC Sierra
- Inability to set or maintain a constant speed using the cruise control.
- Cruise control engaging intermittently or not at all.
- Inability to adjust speed using the coast function while cruise control is engaged.
- Illumination of the cruise control warning light on the dashboard.
- Possible loss of fuel efficiency due to inability to utilize cruise control.
How to Fix P155B 2014 GMC Sierra
- Begin by conducting a thorough visual inspection of the cruise control system, checking for any obvious signs of damage or loose connections.
- Use a multimeter to test the cruise control switches for continuity and proper functionality.
- Inspect the wiring harness for any breaks, frays, or corrosion, and repair or replace as necessary.
- Test the cruise control module and speed sensor for proper operation, replacing any components that are found to be faulty.
- Clear the DTC from the vehicle's ECU using a diagnostic scan tool, and test the cruise control system to ensure proper functionality.
Cost to Fix P155B 2014 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 extent of the repairs needed. In general, the parts required for this repair, such as switches, wiring harnesses, or control modules, can range from $100 to $500. Labor costs at auto repair shops typically range from $80 to $150 per hour, and the total repair time may vary depending on the complexity of the issue. Therefore, the total cost of addressing this code could range from $200 to $1000 or more, depending on the specific circumstances. It is advisable to consult with a qualified mechanic or dealership to obtain a more accurate estimate based on the individual vehicle and situation.
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Frequently Asked Questions about P155B 2014 GMC Sierra Code
1. What does the OBDII code P155B mean on a 2014 GMC Sierra?
P155B indicates an issue with the Cruise Control Set/Coast Switch 2 Circuit, which is part of the cruise control system responsible for maintaining or reducing vehicle speed.
2. What are the common symptoms of code P155B in a 2014 GMC Sierra?
The most common symptoms include cruise control not engaging or functioning properly, the cruise control light not illuminating, and potentially an illuminated check engine light.
3. What causes the P155B code to appear in a 2014 GMC Sierra?
Possible causes include a faulty cruise control switch, damaged wiring or connectors in the Set/Coast circuit, or an issue with the body control module (BCM).
4. How can I diagnose the P155B code on my GMC Sierra?
Start by using an OBDII scanner to confirm the code. Then inspect the cruise control switch, wiring, and connectors for damage or corrosion. Test the switch's functionality using a multimeter if necessary.
5. Can a faulty cruise control switch cause the P155B code?
Yes, a malfunctioning cruise control switch is a common cause of this code, as it may fail to send proper signals to the vehicle’s control module.
6. Is it safe to drive my 2014 GMC Sierra with the P155B code?
Yes, it is generally safe to drive, but the cruise control system may not function until the issue is resolved. Address the problem promptly to restore full functionality.
7. How much does it cost to fix the P155B code on a GMC Sierra?
Repair costs can vary, but replacing a cruise control switch typically costs between $100 and $300, including parts and labor. Wiring repairs may be less expensive.
8. Can I fix the P155B code on my GMC Sierra myself?
If you’re comfortable with basic automotive repairs, you can inspect and replace the cruise control switch or repair damaged wiring yourself. Otherwise, consult a professional mechanic.
9. Will resetting the ECU clear the P155B code permanently?
Resetting the ECU may temporarily clear the code, but if the underlying issue persists, the code will return. Proper diagnosis and repair are necessary to resolve the problem.
10. How can I prevent the P155B code from recurring on my GMC Sierra?
Regularly inspect and maintain the cruise control system, including the switch and wiring. Address any signs of wear, corrosion, or damage promptly.
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