U1040
Lost Communication With Electronic Brake Control Module
U1040 is an OBD-II diagnostic trouble code meaning: Lost Communication With Electronic Brake Control Module. Common causes: open or short circuit in the communication circuit, brake control module (ebcm) malfunction. Estimated repair cost: $56–278.
Symptoms
- The ABS indicator on the dashboard is on
- Disabling ABS and ESP
- Problems with the brake system
- Other related trouble codes appear
- Reduced functionality of security systems
Causes
- Open or short circuit in the communication circuit
- Brake control module (EBCM) malfunction
- EBCM power supply problems
- Corrosion or poor contact in connectors
- Software errors in the EBCM module
How to Fix
- Check the integrity of the wiring harness to the EBCM module
- Check the power and ground of the EBCM
- Inspect and clean connector contacts
- Scan the EBCM for additional codes
- Replace EBCM if necessary
- Repair only from an authorized dealer
Related codes
FAQ
What does the U1040 code mean?
U1040 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Electronic Brake Control Module
What causes a U1040 error code?
The most common causes of U1040 include: Open or short circuit in the communication circuit; Brake control module (EBCM) malfunction; EBCM power supply problems; Corrosion or poor contact in connectors.
How do I fix a U1040 diagnostic trouble code?
To fix U1040: Check the integrity of the wiring harness to the EBCM module. Check the power and ground of the EBCM. Inspect and clean connector contacts. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U1040?
Do not drive — repair immediately
How much does it cost to fix U1040?
The estimated repair cost for U1040 is $56–278. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat