U1858
Electronic Brake Control Module Lost Communication With Hybrid/EV Powertrain Control Module On Chassis Expansion CAN Bus
U1858 is an OBD-II diagnostic trouble code meaning: Electronic Brake Control Module Lost Communication With Hybrid/EV Powertrain Control Module On Chassis Expansion CAN Bus. Common causes: broken or damaged can bus wires, poor contact in connectors. Estimated repair cost: $56–278.
Symptoms
- Check Engine Light Is On
- Loss of regenerative braking function
- Unstable operation of the brake system
- Reduced braking performance
- Possible problems with switching driving modes
Causes
- Broken or damaged CAN bus wires
- Poor contact in connectors
- EBCM module malfunction
- Problems with module power supply
- Hybrid Control Module (HPCM) Malfunction
How to Fix
- Check the integrity of the CAN bus wiring
- Inspect and clean the connector contacts
- Check power supply and grounding of modules
- Scan both modules for additional errors
- If necessary, replace the faulty module
Related codes
FAQ
What does the U1858 code mean?
U1858 is an OBD-II diagnostic trouble code that indicates: Electronic Brake Control Module Lost Communication With Hybrid/EV Powertrain Control Module On Chassis Expansion CAN Bus
What causes a U1858 error code?
The most common causes of U1858 include: Broken or damaged CAN bus wires; Poor contact in connectors; EBCM module malfunction; Problems with module power supply.
How do I fix a U1858 diagnostic trouble code?
To fix U1858: Check the integrity of the CAN bus wiring. Inspect and clean the connector contacts. Check power supply and grounding of modules. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U1858?
Limited driving only, diagnose soon
How much does it cost to fix U1858?
The estimated repair cost for U1858 is $56–278. Actual cost depends on your vehicle, location, and labor rates.
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