OBD Guide
ENFRDEESPT

U185A

Lost Communication With Battery Energy Control Module On High Voltage Energy Management CAN Bus

U185A is an OBD-II diagnostic trouble code meaning: Lost Communication With Battery Energy Control Module On High Voltage Energy Management CAN Bus. Common causes: open or short circuit in the can bus, becm power or grounding problems. Estimated repair cost: $278–1667.

Severity
🔴 High
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$278–1667 (est.)

Symptoms

  • Check Engine Light Illuminated
  • Power Loss or Power Limitation
  • Error message on the dashboard
  • Problems with charging a high-voltage battery
  • The car goes into emergency mode

Causes

  • Open or short circuit in the CAN bus
  • BECM power or grounding problems
  • Malfunction of the BECM module itself
  • Corrosion of electrical connectors
  • Problems with another module in the CAN network

How to Fix

  1. Check the condition of the fuses associated with the BECM
  2. Inspect the BECM module connectors and wiring for damage.
  3. Check the integrity of the CAN bus and the resistance of the terminators
  4. Diagnose the BECM module using a scanner
  5. Replace BECM if necessary
  6. Repair only from an authorized dealer

Related codes

U185BU1859U0100

FAQ

What does the U185A code mean?

U185A is an OBD-II diagnostic trouble code that indicates: Lost Communication With Battery Energy Control Module On High Voltage Energy Management CAN Bus

What causes a U185A error code?

The most common causes of U185A include: Open or short circuit in the CAN bus; BECM power or grounding problems; Malfunction of the BECM module itself; Corrosion of electrical connectors.

How do I fix a U185A diagnostic trouble code?

To fix U185A: Check the condition of the fuses associated with the BECM. Inspect the BECM module connectors and wiring for damage.. Check the integrity of the CAN bus and the resistance of the terminators. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U185A?

Yes, but get it checked soon

How much does it cost to fix U185A?

The estimated repair cost for U185A is $278–1667. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat