Fault Code Lookup › Network codes › U029D
U029D Network · generic range, no listed definition
U029D fault code: what 4 owners reported
U029D sits in the generic network range (network: communication between the car's control modules), but its SAE definition is not in CarHooq's list, so this page shows only what owners reported. What it meant in practice is below, from 4 complaints owners filed with NHTSA. Updated November 9, 2026.
- 4owner reports
- 2car models
- 0mention a crash
- 0mention a fire
- 2014–2022model years
Which cars get code U029D?
Every model whose owners mentioned U029D in a complaint, most reports first. Each year opens that car's full problem report. Popular models collect more reports because more of them are on the road.
Ford F-250
1 reportWhere does U029D show up?
By brand
- Chevrolet3
- Ford1
Component the owner filed it under
Is there a recall for U029D?
As of November 9, 2026, no NHTSA recall on the cars reporting U029D names this code or its most-reported component. Recalls can be issued at any time: check your VIN at nhtsa.gov/recalls.
What happened when owners saw U029D?
4 of the 4 reports, spread across the models above, as the owners wrote them. NHTSA removes names and VINs; long reports are trimmed. CarHooq has not verified individual claims.
Lost power while driving for 30 seconds. While on the interstate. Now truck battery has to be jumped to start. Dashboard giving out random codes. Check 4x4, check DEF( def is still at half full), check trailer( no trailer is connected) Took to dealership, 4 active codes P0336, P12A6, U029D, U029E. Test failed since code cleared U18D7, U18FE Current codes C1596, C15AC
Hi. I took my 2021 f250 6,7 to the ford dealership as it was having trouble starting, and just wasn’t running great. They changed the batteries, and told me it was a NOX sensor. So I went and got my truck to fix the sensors myself; because they wanted to charge me close to 3 grand. The next day I got up, lo and behold it wouldn’t crank. I had to have it towed back to the dealership. I tested codes before I had it towed, and took a video of it not cranking. The following codes showed. P2291 PCM - Injector Ctrl Press Too Low - Engine Cranking P2209 PCM - NOx Sens Heater Sense Circ Range/Perf Bank 1 Sens 1 U029D PCM - Lost Comm With NOx Sensor A P2535 PCM - Ignition Switch On/Start Pos Circ…
2017 CHEVY SILVERADO 2500HD LT 6.6L It all started on June 15, 2024 with a TRAILER BRAKE CONTROLLER (chafing wire that was grounding and shorting against the frame and bumper) resulted in a barrage of issues. Our truck being down over a month and throwing (so far) 16 codes just on the first 2 scanners. It has also taken out the TPMS too. U0137 Trailer Brake Control Module P1050 Reductant Level Sensor P11DB NOX SENOR 1 U0076 CONTROL MODULE COMMUNICATION POWERTRAIN SENSOR U101E LOST COMMUNICATIONS WITH DEDUCTANT CONTROL MODULE U029D LOST COMMUNICATIONS WITH NOX SENSOR 1 U029E LOST COMMUNICATIONS WITH NOX SENSOR 2 U02A3 LOST COMMUNICTIONS WITH PARTICULATE MATTER SENSOR U18A2 LOST COMMUNICATIONS…
I HAVE SEVERAL DTC CODES U029D U029E P0420 P220B ON THREE OCCASIONS. THESE CODE ARE TRIGGERING A LIMITED SPEED AND POSSIBLE POWER REDUCTION. THE DEALER SHIP STATES THAT GMC PROTOCOL IS TO REPLACE ONE SENSOR AT A TIME AND LET THE CUSTOMER GO SO THEY CAN BREAKDOWN AGAIN. THE PART THAT IS FAILING I AM TOLD IS THE DIESEL PARTICULATE FILTER, BUT GMC CAN NOT SUPPLY THE DEALERSHIPS WITH THE HIGH DEMAND. THIS SEEMS LIKE A FAULTY DESIGN THAT MAY WORK DURING THE WARRANTY PERIOD, BUT SHORTY FAILS AFTER. I DID REPORT EXHAUST SMELL IN THE TRUCK WHILE DRIVING . I WAS GIVEN A REPORT AND A LARGE REPAIR BILL ONLY TO BREAKDOWN IN 126 MILES.
U029D: questions drivers ask
What does code U029D mean?
U029D sits in the generic network range (network: communication between the car's control modules), but its SAE definition is not in CarHooq's list, so CarHooq shows only what owners reported. 4 owners reported it to NHTSA, most often for the Chevrolet Silverado (3), Ford F-250 (1); their reports describe what happened.
Which cars get code U029D most often?
In NHTSA owner complaints, U029D is mentioned most for the Chevrolet Silverado (3), Ford F-250 (1), across 2 models and model years 2014 to 2022. Popular models collect more reports because more of them are on the road.
Is there a recall for code U029D?
As of November 2026, no NHTSA recall on the cars reporting U029D names this code or its most-reported component. Recalls can be issued at any time, so check your VIN at nhtsa.gov/recalls.
What should I do if my car shows U029D?
Write down when the code appeared and what the car did (warning lights, loss of power, noises, speed, weather). Check your VIN for open recalls at nhtsa.gov/recalls, ask a dealer or independent workshop to read the stored freeze-frame data before anyone clears the code, and keep the repair order. If the car loses power in traffic, stop driving it. CarHooq does not diagnose: these are owner reports and official recall notices, not repair advice.
How this page was made
CarHooq read the text of every owner complaint filed with NHTSA for 19 US and European brands (model years 2012 onwards) and picked out the diagnostic trouble codes owners wrote down. This page lists every mention of U029D. The code is in a generic range but its standard definition is not in CarHooq's list, so CarHooq shows only what owners reported. Nothing here is a diagnosis. More answers: the fault code FAQ. Data: NHTSA Office of Defects Investigation (public domain), retrieved November 9, 2026. How CarHooq reports are made.
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