The Lemon IndexAnother computer in the car received data from the transfer case module that did not make sense.
Get it fixed soon. A few more days of normal driving is usually OK, but waiting can turn a small repair into a bigger one or a breakdown.
A fault inside the transfer case module. Then: network wiring problem; needs a software update.
Owners named U0403 in 5 complaints to the U.S. government, most often on the Ram pickup.
Cars owners report it on
Complaints that name U0403, by model. Raw counts, not a failure rate: popular models get more complaints.
Years owners report it on most: 2019 Ram pickup
The details
What U0403 means
Another computer in the car received data from the transfer case module that did not make sense.
Can I drive with U0403?
Get it fixed soon. A few more days of normal driving is usually OK, but waiting can turn a small repair into a bigger one or a breakdown.
60% of the owner complaints that name U0403 also say the car brakes or ABS act up. A complaint can describe more than one problem, so this doesn't prove the code caused it.
Common causes of U0403
- A fault inside the transfer case module
- Network wiring problem
- Needs a software update
- Weak battery
A shop should confirm the cause with a scan and tests before replacing parts.
What owners describe
- Brakes or ABS act up: 60% of complaints
- Warning lights and electrical faults: 40% of complaints
Share of complaints naming the code whose text also mentions each problem.
Model years that report U0403 most
2019 Ram pickup (2).
Related codes
U0402 U0404 U0401 U0415 U0416 U0418 U0420 U0422
Quick answers
What does U0403 mean?
Invalid Data Received From Transfer Case Control Module. Another computer in the car received data from the transfer case module that did not make sense.
Can I drive with U0403?
Get it fixed soon. A few more days of normal driving is usually OK, but waiting can turn a small repair into a bigger one or a breakdown.
What causes U0403?
A fault inside the transfer case module; Network wiring problem; Needs a software update; Weak battery.
Counts: NHTSA owner complaints whose text names U0403. A complaint is an owner's report, not a diagnosis. Meanings: the standard SAE J2012 definitions in our own words; manufacturer codes only where verified for that make. General information, not repair advice for your car.