U1815 Code - Lost Communication With Drive Motor Control Module 1 On Bus B
Quick Answer
Devices connected to the powertrain high-speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Drive Motor Control Module 1, Drive Motor Control Module 1 harness is open or shorted, Drive Motor Control Module 1 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
- U1815 indicates Lost Communication With Drive Motor Control Module 1 On Bus B.
- Common causes
- Common causes include Faulty Drive Motor Control Module 1, Drive Motor Control Module 1 harness is open or shorted, Drive Motor Control Module 1 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 U1815 Description
The Diagnostic Trouble Code (DTC) will set when a supervised periodic message that includes the transmitter device availability has not been received.
What are the Possible Causes of the DTC U1815?
- Faulty Drive Motor Control Module 1
- Drive Motor Control Module 1 harness is open or shorted
- Drive Motor Control Module 1 circuit poor electrical connection
How to Fix the DTC U1815?
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 U1815 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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Information for Specific Makes
- U1815 Buick — Lost Communication With Drive Motor Control Module 1 On Bus B
- U1815 Cadillac — Lost Communication With Drive Motor Control Module 1 On Bus B
- U1815 Chevrolet — Lost Communication With Drive Motor Control Module 1 On Bus B
- U1815 GMC — Lost Communication With Drive Motor Control Module 1 On Bus B
Frequently Asked Questions about U1815 Code
1. What are the common symptoms of OBDII code U1815 (Lost Communication With Drive Motor Control Module 1 On Bus B)?
- Common symptoms include loss of power steering, erratic vehicle speed, and the inability to shift gears smoothly.
2. What are some possible causes of OBDII code U1815?
- Possible causes include a faulty drive motor control module, damaged wiring or connectors, or a communication network issue.
3. How can I diagnose the cause of OBDII code U1815?
- Diagnose by checking the wiring and connectors for damage, ensuring proper power supply to the drive motor control module, and performing a communication network test.
4. Can a loose or corroded electrical connection trigger OBDII code U1815?
- Yes, a loose or corroded electrical connection can disrupt communication between the drive motor control module and other modules, triggering the U1815 code.
5. What are some repair tips for resolving OBDII code U1815?
- Repair tips include checking and repairing any damaged wiring or connectors, ensuring all modules have proper power supply, and resetting the fault codes after repairs.
6. Is it safe to continue driving with OBDII code U1815 present?
- It is not recommended to continue driving with the U1815 code present, as it can lead to further damage and unsafe driving conditions.
7. Can a software update fix OBDII code U1815?
- In some cases, a software update provided by the vehicle manufacturer can resolve the communication issue causing the U1815 code.
8. How do I reset the OBDII code U1815 after performing repairs?
- Use an OBDII scan tool to clear the fault codes after completing the necessary repairs to reset the U1815 code.
9. Are there any recalls related to OBDII code U1815?
- Check with the vehicle manufacturer or the National Highway Traffic Safety Administration (NHTSA) for any recalls related to the U1815 code.
10. Can a professional mechanic help diagnose and repair OBDII code U1815?
- Yes, a professional mechanic with experience in diagnosing and repairing communication network issues can help resolve the U1815 code effectively.
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