U1004 on Hyundai
On Hyundai hybrids, U1004 is a CAN communication code for the hybrid control network, typically stored with U0293 lost communication with the hybrid powertrain control module
Severity: Inspect soon
Owners report limp mode, a hybrid system that stops charging, dashboard lights all coming on at highway speed and ABS CAN time-outs with this code, so propulsion and braking support can be affected.
It gets more serious if:
- Stop: Stop if the car goes into limp mode, loses power, stalls or every dash light comes on while driving: pull over safely and arrange a tow.
This page covers only what differs on Hyundai. For what U1004 means, the ranked causes and the test order, see the U1004 guide.
What's different on Hyundai
HyundaiYour car
2012–2018 · Sonata
Supported by vehicle dataOwners and a technician summary report U1004 with U0293 on Sonata Hybrids, with limp mode and stalls.
Sources and review
- U1004 dtc (IATN technician network summary)
- NHTSA complaint ODI 11462848: 2018 Hyundai Sonata Hybrid
- NHTSA complaint ODI 11769494: 2014 Hyundai Sonata Hybrid
- NHTSA complaint ODI 11716603: 2017 Hyundai Sonata
- NHTSA complaint ODI 11732884: 2012 Hyundai Sonata
- Last reviewed
- Written by
- Saurabh K.
- Editorial review
- Pending
- Technician review
- Technician review pending
This page explains what a code usually means; it is not a substitute for a professional inspection. How we source and review · Report an error