U189A
DC To DC Converter Control Module 'A' Lost Communication With Hybrid Powertrain Control Module
U189A is an OBD-II diagnostic trouble code meaning: DC To DC Converter Control Module 'A' Lost Communication With Hybrid Powertrain Control Module. Common causes: open or short circuit in the can bus, problems with connectors or contacts. Estimated repair cost: $167–889.
Symptoms
- Check Engine Light Is On
- Possible interruptions in the operation of electrical equipment
- The car may go into emergency mode
- Hybrid system power reduction
- Problems with charging a 12V battery
Causes
- Open or short circuit in the CAN bus
- Problems with connectors or contacts
- Malfunction of the DC-DC converter module
- Problems with the hybrid control module
- Wiring harness damage
How to Fix
- Check fault codes in other modules
- Diagnose the state of the CAN bus
- Check power supply and grounding of modules
- Inspect connectors for corrosion or damage
- If necessary, replace the faulty module
Related codes
FAQ
What does the U189A code mean?
U189A is an OBD-II diagnostic trouble code that indicates: DC To DC Converter Control Module 'A' Lost Communication With Hybrid Powertrain Control Module
What causes a U189A error code?
The most common causes of U189A include: Open or short circuit in the CAN bus; Problems with connectors or contacts; Malfunction of the DC-DC converter module; Problems with the hybrid control module.
How do I fix a U189A diagnostic trouble code?
To fix U189A: Check fault codes in other modules. Diagnose the state of the CAN bus. Check power supply and grounding of modules. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U189A?
Do not drive — repair immediately
How much does it cost to fix U189A?
The estimated repair cost for U189A is $167–889. Actual cost depends on your vehicle, location, and labor rates.
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