U1555 Chevrolet Code - Body Control Module Lost Communication With Left Rear Seat Heating/Venting/Cooling Switch 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 Left Rear Seat Heating/Venting/Cooling Switch, Left Rear Seat Heating/Venting/Cooling Switch harness is open or shorted, Left Rear Seat Heating/Venting/Cooling Switch 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
- 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, Left Rear Seat Heating/Venting/Cooling Switch harness is open or shorted, Left Rear Seat Heating/Venting/Cooling Switch 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 U1555 Chevrolet Description
What are the Possible Causes of the DTC U1555 Chevrolet?
- Faulty Left Rear Seat Heating/Venting/Cooling Switch
- Left Rear Seat Heating/Venting/Cooling Switch harness is open or shorted
- Left Rear Seat Heating/Venting/Cooling Switch circuit poor electrical connection
- Faulty Body Control Module (BCM)
How to Fix the DTC U1555 Chevrolet?
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 U1555 Chevrolet 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 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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