U1894
Hybrid Control Module Lost Communication With Starter/Generator Control Module
U1894 is an OBD-II diagnostic trouble code meaning: Hybrid Control Module Lost Communication With Starter/Generator Control Module. Common causes: open or short circuit in the can bus, hybrid control module (hcm) malfunction. Estimated repair cost: $167–556.
Symptoms
- The hybrid system goes into emergency mode
- Check Engine light comes on
- Problems with starting the internal combustion engine
- Reduced energy recovery efficiency
- Hybrid system power loss
Causes
- Open or short circuit in the CAN bus
- Hybrid Control Module (HCM) Malfunction
- Starter/Generator Module (SGCM) Problems
- Corroded or damaged connectors
- Problems with module power supply
How to Fix
- Check the integrity of the CAN bus between modules
- Inspect connectors and wiring harnesses for damage
- Check power and ground of modules
- Read fault codes in both modules
- If necessary, replace the faulty module
- Repair only from an authorized dealer
Related codes
FAQ
What does the U1894 code mean?
U1894 is an OBD-II diagnostic trouble code that indicates: Hybrid Control Module Lost Communication With Starter/Generator Control Module
What causes a U1894 error code?
The most common causes of U1894 include: Open or short circuit in the CAN bus; Hybrid Control Module (HCM) Malfunction; Starter/Generator Module (SGCM) Problems; Corroded or damaged connectors.
How do I fix a U1894 diagnostic trouble code?
To fix U1894: Check the integrity of the CAN bus between modules. Inspect connectors and wiring harnesses for damage. Check power and ground of modules. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U1894?
Do not drive — repair immediately
How much does it cost to fix U1894?
The estimated repair cost for U1894 is $167–556. Actual cost depends on your vehicle, location, and labor rates.
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