U1556 Buick Code - Chassis Control Module Lost Communication With Trailer Brake Power Control Module On LIN Bus
Quick Answer
The Local Interconnect Network (LIN) Bus consists of a single wire with a transmission rate of 10.417 Kbit/s. Common causes include Faulty Trailer Brake Power Control Module, Trailer Brake Power Control Module harness is open or shorted, Trailer Brake Power 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
- U1556 Buick indicates Chassis Control Module Lost Communication With Trailer Brake Power Control Module On LIN Bus.
- Common causes
- Common causes include Faulty Trailer Brake Power Control Module, Trailer Brake Power Control Module harness is open or shorted, Trailer Brake Power 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 U1556 Buick Description
What are the Possible Causes of the DTC U1556 Buick?
- Faulty Trailer Brake Power Control Module
- Trailer Brake Power Control Module harness is open or shorted
- Trailer Brake Power Control Module circuit poor electrical connection
- Faulty Chassis Control Module
How to Fix the DTC U1556 Buick?
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 U1556 Buick 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.
Need more information about the U1556 Buick code?
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Frequently Asked Questions about U1556 Buick Code
1. What are common symptoms of OBDII code U1556 in a Buick?
The common symptoms include the trailer brake system not working properly, ABS or traction control light illuminated on the dashboard, and potential loss of communication with the chassis control module.
2. What does the U1556 code mean in a Buick?
The U1556 code indicates that the chassis control module has lost communication with the trailer brake power control module on the LIN bus, which is the communication network in the vehicle.
3. What are possible causes of the U1556 code in a Buick?
Possible causes of the U1556 code include a faulty trailer brake power control module, damaged wiring or connectors in the LIN bus circuit, a malfunctioning chassis control module, or a communication error between modules.
4. How can I diagnose the U1556 code in my Buick?
Diagnosing the U1556 code may involve checking the wiring and connectors in the LIN bus circuit, testing the trailer brake power control module for functionality, and using a diagnostic scanner to communicate with the chassis control module.
5. Can I still drive my Buick with the U1556 code present?
It is not recommended to drive your Buick with the U1556 code present, as it may affect the proper functioning of the trailer brake system and other safety features controlled by the chassis control module.
6. How can I repair the U1556 code in my Buick?
Repairing the U1556 code may involve repairing or replacing damaged wiring or connectors in the LIN bus circuit, replacing the trailer brake power control module if necessary, and reprogramming or resetting the chassis control module.
7. Is it safe to tow a trailer with my Buick if the U1556 code is active?
It is not safe to tow a trailer with your Buick if the U1556 code is active, as it indicates a communication issue between important control modules that could compromise the trailer brake system's functionality.
8. Can a DIY enthusiast fix the U1556 code in a Buick?
Depending on your level of automotive expertise, you may be able to diagnose the U1556 code yourself by checking wiring and connectors. However, repairing or replacing modules may require professional knowledge and tools.
9. Will resetting the U1556 code make it go away permanently?
Resetting the U1556 code may clear it temporarily, but if the underlying issue causing the code is not addressed, it is likely to reappear. It's important to diagnose and repair the root cause of the problem.
10. How much does it cost to fix the U1556 code in a Buick?
The cost of fixing the U1556 code can vary depending on the specific issue causing the code, the labor rates at the repair shop, and the cost of any parts that need to be replaced. It's recommended to get a diagnostic and repair estimate from a qualified mechanic.
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