U185B Cadillac Code - Battery Energy Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2 On High Voltage Energy Management CAN Bus
Quick Answer
Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Hybrid/EV Powertrain Control Module 2, Hybrid/EV Powertrain Control Module 2 harness is open or shorted, Hybrid/EV Powertrain Control Module 2 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
- U185B Cadillac indicates Battery Energy Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2 On High Voltage Energy Management CAN Bus.
- Common causes
- Common causes include Faulty Hybrid/EV Powertrain Control Module 2, Hybrid/EV Powertrain Control Module 2 harness is open or shorted, Hybrid/EV Powertrain Control Module 2 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 U185B Cadillac Description
This diagnostic is used to check the loss of communication with the Hybrid/EV Powertrain Control Module 2 on high voltage energy management high-speed General Motor Local Area Network (GMLAN) bus. The Battery Energy Control Module supervises a periodic serial data message to check the communication status of the Hybrid/EV Powertrain Control Module 2. If this message is not received within 1 s, this Diagnostic Trouble Code (DTC) is set.
What are the Possible Causes of the DTC U185B Cadillac?
- Faulty Hybrid/EV Powertrain Control Module 2
- Hybrid/EV Powertrain Control Module 2 harness is open or shorted
- Hybrid/EV Powertrain Control Module 2 circuit poor electrical connection
How to Fix the DTC U185B Cadillac?
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 U185B Cadillac 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 U185B Cadillac Code
1. What are the common symptoms of OBDII code U185B in a Cadillac?
- Common symptoms include a check engine light, reduced hybrid/EV performance, and potential drivability issues.
2. What can cause the U185B code to be triggered in a Cadillac?
- The code may be triggered due to a communication failure between the Battery Energy Control Module and the Hybrid/EV Powertrain Control Module 2 on the high voltage energy management CAN bus.
3. How serious is the U185B code in a Cadillac?
- The code indicates a loss of communication between crucial modules in the hybrid/EV system, which can impact the vehicle's performance and efficiency.
4. What are some possible repair tips for resolving the U185B code in a Cadillac?
- Check the wiring and connections between the affected modules, ensure proper power supply, and diagnose any potential software issues or module failures.
5. Can driving with the U185B code present cause further damage to the Cadillac?
- Continuing to drive with the code present can potentially worsen the communication issue between modules and lead to more significant problems with the hybrid/EV system.
6. How can a mechanic diagnose the U185B code in a Cadillac?
- A mechanic can use a professional diagnostic scan tool to retrieve the code, perform a thorough inspection of the communication system, and test the affected modules for proper functionality.
7. Is it possible to reset the U185B code in a Cadillac without repairing the issue?
- While clearing the code may temporarily turn off the check engine light, the underlying communication problem between modules will persist until properly addressed.
8. Are there any recalls or technical service bulletins related to the U185B code in Cadillacs?
- It is recommended to check with the manufacturer or authorized service centers for any relevant recalls or bulletins addressing the U185B code in Cadillacs.
9. How much can a repair for the U185B code in a Cadillac cost?
- Repair costs can vary depending on the underlying issue, but they may range from a simple wiring repair to a module replacement, potentially costing several hundred to a few thousand dollars.
10. Can a Cadillac owner with basic automotive knowledge attempt to fix the U185B code themselves?
- Due to the complexity of the hybrid/EV system and the need for specialized diagnostic equipment, it is recommended to seek professional help for diagnosing and repairing the U185B code in a Cadillac.
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