U185C GMC Code - Battery Charger 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
- U185C GMC indicates Battery Charger 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 U185C GMC 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 U185C GMC?
- 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 U185C GMC?
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 U185C GMC 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 U185C GMC Code
1. What does the OBDII code U185C mean on a GMC vehicle?
The U185C code indicates that the Battery Charger Control Module has lost communication with the Hybrid/EV Powertrain Control Module 2 on the High Voltage Energy Management CAN Bus.
2. What are common symptoms of the U185C code on a GMC?
Symptoms may include a check engine light, reduced power mode, charging issues, or the inability to start or operate the vehicle in EV mode.
3. What causes the U185C code to appear?
The code can be triggered by faulty wiring or connectors, a failed Battery Charger Control Module, a malfunctioning Hybrid/EV Powertrain Control Module 2, or issues with the CAN Bus network.
4. Can a weak 12V battery cause the U185C code?
Yes, a weak or failing 12V battery can disrupt communication between modules and potentially trigger the U185C code.
5. How can I diagnose the U185C code on my GMC?
Start by inspecting the wiring and connectors related to the Battery Charger Control Module and Hybrid/EV Powertrain Control Module 2. Use a diagnostic scanner to check for additional CAN Bus faults.
6. Is it safe to drive with the U185C code active?
Driving may be unsafe, as this code often affects the vehicle's hybrid or EV functionality, potentially leading to reduced power or charging issues.
7. What repairs might fix the U185C code?
Repairs can include replacing damaged wiring, repairing or replacing faulty connectors, or replacing a malfunctioning module such as the Battery Charger Control Module or Hybrid/EV Powertrain Control Module 2.
8. Can a software update resolve the U185C code?
In some cases, a software update for the affected modules may resolve communication issues. Check with a GMC dealership for potential updates.
9. What tools are needed to troubleshoot the U185C code?
You’ll need a diagnostic scanner capable of reading GM-specific codes, a multimeter for checking wiring continuity, and potentially an oscilloscope to inspect CAN Bus signals.
10. What is the High Voltage Energy Management CAN Bus?
The High Voltage Energy Management CAN Bus is a communication network that allows hybrid/EV components to exchange data and coordinate operations within the vehicle.
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