2021 Ram 2500 Radio Code: How to Get It?

Identify Your 2021 Ram 2500's Factory Radio

For 2021 the Ram 2500 largely carries forward the Uconnect 4 family used since the 2019 DT HD launch, although Stellantis began introducing the next-generation Uconnect 5 software on Ram products during this period (initially focused on the 1500). On heavy-duty trucks like the 2500, Uconnect 4 hardware remained the dominant build, and individual trucks may differ depending on production date and trim.

1. Uconnect 3 / Uconnect 4 (sales code UAG) - 5-inch base touchscreen. Standard on Tradesman and base Chassis Cab. Visual ID: small 5-inch screen with conventional climate controls below.
2. Uconnect 4C 8.4 NAV (sales code UAQ, Canadian equivalent UCQ) - 8.4-inch landscape touchscreen with built-in GPS, Apple CarPlay and Android Auto (wired). Visual ID: 8.4-inch glass with a dedicated NAV/Map tile.
3. Uconnect 4C NAV 12-inch (sales code UAX) - 12-inch portrait touchscreen, optional on Laramie and standard on Limited. Visual ID: large vertical screen with split-screen capability.

If your 2500 screen looks visibly different from these descriptions - faster boot, larger app icons, a five-profile sign-in screen - your truck may have received the Uconnect 5 software/hardware build that became standard on Ram HD for 2022, and the procedures in the following sections may not all apply.

Screen-Based Serial Lookup Method

2021 Ram 2500 trucks are predominantly Uconnect 4 builds (8.4-inch UAQ/UCQ and 12-inch UAX), and on those head units the same hidden dealer-mode shortcut still exposes the radio serial on screen on most cars. If your truck is one of the early Uconnect 5 builds, the shortcut will not work and you should treat the on-screen method as null - go straight to the chassis-label procedure.

1. Switch the ignition to RUN/ACC and wait for the Uconnect interface to finish loading.
2. Press and hold the driver-side temperature UP, the driver-side temperature DOWN and the front DEFROST buttons together for around 5-10 seconds.
3. If the climate combination does nothing, press and hold the bottom-left and bottom-right corners of the screen for about 5-10 seconds.
4. Open the radio/system info section in the diagnostic menu to read the serial number on screen.
5. Photograph the display so the characters can be transcribed without typos.

If neither the climate-button shortcut nor the corner-press combination opens a diagnostic screen, the head unit is most likely a Uconnect 5 build (or has had a software update that removed the menu) and the chassis-label method should be used instead.

Manufacturer Label Inspection

The factory radio in the 2021 Ram 2500 also carries a printed barcode/sticker label on the chassis. On the fifth-generation DT HD dash the head unit (especially the 12-inch portrait UAX/UBQ) sits inside a wide centre-stack bezel that integrates the screen surround with adjacent climate and storage trim, so the work needs to be done methodically.

1. Safety first: turn the ignition fully off, remove the key fob from the cabin, disconnect the negative battery terminal and wait at least 10-15 minutes before touching wiring so the SRS/airbag capacitors can discharge. Avoid yellow airbag/SRS connectors entirely and use plastic trim tools so nothing shorts or breaks.
2. Tools you will need: plastic trim/panel removal kit, T20 Torx bit, Phillips #2 screwdriver, 7mm socket and short extension, flashlight, clean microfibre to rest the bezel on.
3. Removal overview (2021 Ram 2500 dash): lift the rubber beauty pad on top of the centre stack to expose two T20 Torx screws and remove them; lift the rubber mat in the small cubby behind the 120V outlet to expose a third T20 Torx screw and remove that as well. With those three screws out, pull the centre-stack bezel rearward starting at the lower edge to release the spring clips around its perimeter. The bezel carries the hazard/HVAC switches, so unclip those harnesses before setting it aside on a clean cloth. Remove the four 7mm screws securing the radio cage to the dash support bracket, then slide the head unit straight rearward and disconnect the antenna lead and the multi-pin power/data connectors at the rear.
4. Where the serial sits: the serial number is printed on a barcode/sticker label on the top or one side of the radio chassis, alongside the part number and supplier markings. Photograph the label up close and double-check ambiguous characters such as 0/O, 1/I and B/8 before submitting the value.
5. Tips and professional advice: the 12-inch UAX/UBQ portrait head unit on the 2500 is deeply integrated into the wider centre-stack trim and shares hardware with the climate cluster, hazard switch and 120V outlet bezel - if the trim resists, stop and double-check for hidden screws rather than pulling harder. Owners who are not comfortable working around airbag wiring or releasing the wide integrated bezel should have a professional installer or dealer technician remove the unit instead; an experienced shop typically completes this in well under an hour.

Standard Serial Number Patterns on This Radio

The factory radios fitted to the 2021 Ram 2500 use the standard Mopar/Uconnect head-unit serial style. The exact prefix depends on the Uconnect tier shipped with the truck and the supplier (Mitsubishi Electric, Continental, Harman or Visteon) that built the unit, so any prefix list found online should be treated as a guide rather than a strict rule.

Uconnect 4C 8.4 (UAQ / UCQ) and 12-inch UAX

1. Typically a 14-character alphanumeric string printed on the chassis label.
2. Commonly begins with T - frequent prefixes include T00AM, TM9 and TQ1 - or with A2C on Continental-built variants.
3. Usually a continuous run of letters and digits with no dashes or spaces.

Uconnect 3 / Uconnect 4 5-inch (UAG)

1. Usually carries a Mopar/Visteon or Panasonic-style serial on the chassis sticker, so the printed label on the unit itself is the authoritative reference.
2. Always copy the serial exactly as printed and avoid guessing characters that look unclear.