U1555 Chevrolet Code - Body Control Module Lost Communication With Left Rear Seat Heating/Venting/Cooling Switch On LIN Bus
Quick Answer
The U1555 Chevrolet diagnostic trouble code indicates that the Body Control Module (BCM) has lost communication with the left rear seat heating/venting/cooling switch on the Local Interconnect Network (LIN) bus. Common causes include Faulty left rear seat heating/venting/cooling switch, Wiring or connection issues in the LIN bus network, BCM failure or malfunction. 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
- U1555 Chevrolet indicates Body Control Module Lost Communication With Left Rear Seat Heating/Venting/Cooling Switch On LIN Bus.
- Common causes
- Common causes include Faulty left rear seat heating/venting/cooling switch, Wiring or connection issues in the LIN bus network, BCM failure or malfunction.
- 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 U1555 Chevrolet Description
The U1555 Chevrolet diagnostic trouble code indicates that the Body Control Module (BCM) has lost communication with the left rear seat heating/venting/cooling switch on the Local Interconnect Network (LIN) bus. The LIN bus is a communication network used by various modules in the vehicle to exchange data and signals. When the BCM loses communication with the left rear seat switch, it can result in a loss of control over the heating, venting, or cooling functions for that particular seat. This can lead to discomfort for passengers in the rear seat and may also affect the overall climate control system in the vehicle.
Common Causes of U1555 Chevrolet
- Faulty left rear seat heating/venting/cooling switch.
- Wiring or connection issues in the LIN bus network.
- BCM failure or malfunction.
- Software glitches or errors in the BCM programming.
- Water damage or corrosion in the electrical components.
Symptoms of U1555 Chevrolet
- Inability to control the heating, venting, or cooling functions of the left rear seat.
- Malfunction or erratic behavior of the HVAC system.
- Illumination of warning lights on the instrument cluster.
- Loss of communication with other modules in the vehicle.
- In some cases, the vehicle may go into a "limp mode" to prevent further damage.
How to Fix U1555 Chevrolet
- Perform a thorough diagnostic scan to confirm the U1555 code and identify any additional related codes.
- Inspect the left rear seat heating/venting/cooling switch and its connections for any visible damage or issues.
- Check the wiring harness and connectors in the LIN bus network for continuity and proper connections.
- If no visible issues are found, reprogram or replace the BCM as necessary.
- Clear the code and perform a test drive to verify that the issue has been resolved.
Cost to Fix U1555 Chevrolet
The cost of repairing the U1555 Chevrolet code can vary depending on the exact cause of the issue and the labor rates in your area. On average, you can expect to pay between $200 and $500 for parts and labor. Keep in mind that diagnostic time and labor rates can vary, so it's best to get a specific quote from a trusted auto repair shop.
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Frequently Asked Questions about U1555 Chevrolet Code
1. What does the OBDII code U1555 mean on a Chevrolet?
It means the Body Control Module (BCM) has lost communication with the left rear seat heating, venting, or cooling switch on the LIN (Local Interconnect Network) bus.
2. What are common symptoms of code U1555 in a Chevrolet?
Symptoms may include the left rear seat heating, cooling, or venting functions not working, a warning light on the dashboard, or intermittent seat control issues.
3. What causes the U1555 code to appear?
Common causes include a faulty left rear seat switch, damaged wiring or connectors in the LIN bus circuit, a malfunctioning Body Control Module (BCM), or software glitches.
4. Can I drive my Chevrolet with the U1555 code active?
Yes, but the affected seat's heating, cooling, or venting features may not function, and the issue could signal potential wiring or communication problems that may worsen over time.
5. How can I diagnose the U1555 code on my Chevrolet?
Start by checking the LIN bus wiring and connectors for damage or corrosion, inspecting the left rear seat switch, and using a diagnostic scanner to confirm communication between the BCM and the switch.
6. What are common repair steps for fixing the U1555 code?
Repairs may include replacing the faulty left rear seat switch, repairing or replacing damaged wiring, cleaning or securing connectors, or updating BCM software.
7. Is the U1555 code a serious issue?
It's not critical for vehicle operation but should be addressed to restore seat functionality and ensure the LIN communication network remains stable.
8. How much does it cost to fix the U1555 code on a Chevrolet?
Costs vary depending on the issue, but replacing a seat switch may cost $100–$300, while repairing wiring or connectors may range from $50–$200.
9. Can a dead battery cause the U1555 code?
Yes, a low or dead battery can disrupt the LIN bus communication and trigger the U1555 code. Ensure the battery is fully charged and in good condition.
10. Do I need a professional to fix the U1555 code?
While basic checks like inspecting wiring can be done at home, a professional may be needed for advanced diagnostics or programming the BCM.
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