B388E GMC Code - Trailer Lamps Number Of Intermittent Short Circuit Detections Exceeded Signal Cross Coupled
Quick Answer
The Trailer Interface Control Module is supplied with battery voltage as well as ignition voltage from the rear body fuse block and is permanently grounded. Common causes include Faulty Trailer Interface Control Module, Trailer Interface Control Module harness is open or shorted, Trailer Interface Control Module circuit poor electrical connection. 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
- B388E GMC indicates Trailer Lamps Number Of Intermittent Short Circuit Detections Exceeded Signal Cross Coupled.
- Common causes
- Common causes include Faulty Trailer Interface Control Module, Trailer Interface Control Module harness is open or shorted, Trailer Interface Control Module circuit poor electrical connection.
- 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.
Code B388E GMC Description
For stop lamp operation, the Trailer Interface Control Module receives an input from the center high mount stop lamp control circuit. When the brakes are applied on the vehicle, the Trailer Interface Control Module receives the brake applied input from the center high mount stop lamp control circuit. The trailer interface control module responds by applying voltage to the trailer stop lamp control circuit illuminating the trailer stop lamps. The trailer interface control module also receives a serial data message from the BCM indicating that the vehicle brakes have been applied.
What are the Possible Causes of the DTC B388E GMC?
- Faulty Trailer Interface Control Module
- Trailer Interface Control Module harness is open or shorted
- Trailer Interface Control Module circuit poor electrical connection
How to Fix the DTC B388E GMC?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B388E GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about B388E GMC Code
1. What are the common symptoms of OBDII code B388E GMC?
The common symptoms of this code may include malfunctioning trailer lamps, intermittent short circuits, and possible issues with signal cross coupling.
2. What could cause OBDII code B388E GMC to trigger?
This code is typically triggered when the number of intermittent short circuit detections related to trailer lamps exceeds the threshold, indicating a potential signal cross coupling issue.
3. How can I diagnose the cause of OBDII code B388E GMC?
Diagnosing this code may involve checking the wiring and connections related to the trailer lamps, inspecting for any signs of short circuits, and testing the signal lines for cross coupling.
4. What are the possible repair options for OBDII code B388E GMC?
Repair options may include repairing or replacing damaged wiring, ensuring proper grounding for the trailer lamps, and addressing any issues with signal cross coupling to resolve the code.
5. Can OBDII code B388E GMC be safely ignored?
While the vehicle may still be operable with this code present, it is recommended to address the underlying issue to ensure the proper functioning of the trailer lamps and prevent potential electrical problems.
6. Is it possible to reset OBDII code B388E GMC without fixing the underlying issue?
Resetting the code without addressing the root cause, such as repairing short circuits or signal cross coupling, may temporarily clear the code but is unlikely to prevent it from reoccurring.
7. Are there any safety concerns associated with OBDII code B388E GMC?
Since this code relates to trailer lamps, it is important to address it promptly to ensure proper visibility and signaling while towing a trailer, reducing the risk of accidents or safety hazards.
8. Can a DIY enthusiast repair OBDII code B388E GMC?
Depending on their skill level and access to tools, a DIY enthusiast may be able to address this code by inspecting and repairing wiring, connections, and grounding related to the trailer lamps.
9. How long does it typically take to repair OBDII code B388E GMC?
The repair time for this code can vary based on the extent of the wiring or signal cross coupling issues, but it may take a few hours to a day to diagnose and fix the problem effectively.
10. Will fixing OBDII code B388E GMC improve fuel efficiency or performance?
While resolving this code may not directly impact fuel efficiency or performance, it is essential for maintaining the proper functioning of the trailer lamps and ensuring electrical system integrity in the vehicle.
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