Fault Code U029A
Code meaning, symptoms, possible causes, part number, and estimated cost.
U029A
Lost Communication With On Board Charger Control Module
Code U029A indicates a loss of communication with the On Board Charger (OBC) Control Module. This module is essential for charging the electric/hybrid vehicle battery using an external power source. Loss of communication will prevent the charging process and can leave the vehicle unable to drive after the battery is depleted. The fault is usually caused by a wiring problem or the module itself.
Part Details
Part Name
On Board Charger Control Module
Reference P/N (OEM)
N/A
General part number for this fault code — not necessarily for your specific vehicle
Estimated Cost
₪1200 - ₪4500
Engine Location
In the trunk or under the vehicle, near the HV battery
Symptoms
- Check Engine Light on
- Vehicle not charging (does not respond to charger connection)
- Charging indicator lights not working
- Error messages on the dashboard related to charging
Possible Causes
- 1Faulty On Board Charger Control Module
- 2Wiring or connection issues in the CAN Bus network to the module
- 3Blown fuse supplying power to the module
- 4External charging connection fault
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