When will I receive my 2021 4500 radio code?

Delivery is instant in most Ram 4500s. In rare cases, Ram 4500 radio code delivery can take up to a day.

Is there a money-back guarantee in case the code fails?

We offer a full refund if the code doesn't work. A proof that the code failed may be required. Check the Refund Policy page for more information.

Find Ram 4500 2021 Radio Code In Seconds

Why Did the Radio Lock and Ask for a Code?

The Ram 4500's Uconnect 4C activates anti-theft after the battery is disconnected or replaced. Commercial chassis cab owners encounter this most often because of:

Battery replacement during service — the most common trigger. Commercial vehicles get regular fleet maintenance and battery changes are common.
Upfit electrical work — 4500 chassis cabs are frequently upfitted which requires electrical disconnects, activating the anti-theft.
Blown fuse — common after commercial electrical work.
Buying pre-owned without a known unlock code.

The code is tied to the radio's serial number — not the VIN.

How to Find the Serial Number on Your 2021 Ram 4500 Radio?

The important thing to know is that factory radios use a specific S/N to identify each unitindividually.

Your security system matches the code directly to the serial.

Unlike car-specific data like VIN or registration information, it is not determined by the model or production year, so you'll be able to generate it even if you have an aftermarket radio.

Depending on the maker and radio installed in your Ram 4500, the access method is different.

These are the best ways to find it.

Identify Your 2021 Ram 4500's Factory Radio

For 2021 the Ram 4500 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 4500, Uconnect 4 hardware remained the dominant build, and individual trucks may differ depending on production date and trim.

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.
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.
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 4500 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.

Accessing the Serial Number Through the Radio Menu

These are the steps you should follow for 2021 Ram 4500:

The 2021 Ram 4500 severe-duty chassis truck features the Uconnect 4C (RA4) 8.4" touchscreen fitted in the work cab interior. The serial number is retrievable via Dealer Mode:

Turn ignition to ACC or ON.
Press the bottom-left and bottom-right corners of the physical screen bezel (plastic frame, not glass) simultaneously for 5 seconds.
Dealer Mode appears on the display.
Navigate to: System Info → Radio Part Info → Serial Number.

Note Dealer Mode may be restricted on some 2021 4500 units after a software update. If so, physical removal is required.

Screen-Based Serial Lookup Method

2021 Ram 4500 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.

Switch the ignition to RUN/ACC and wait for the Uconnect interface to finish loading.
Press and hold the driver-side temperature UP, the driver-side temperature DOWN and the front DEFROST buttons together for around 5-10 seconds.
If the climate combination does nothing, press and hold the bottom-left and bottom-right corners of the screen for about 5-10 seconds.
Open the radio/system info section in the diagnostic menu to read the serial number on screen.
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.

Taking Out the Radio Unit to See the S/N on the Tag

If the serial number cannot be accessed on-screen, use the pull-out method.

Most Ram 4500 factory radios include a label with the serial number printed on the housing.

Process details:

Ensure the ignition is off.
Lift away surrounding panel pieces.
Loosen screws holding the radio.
Move slightly to inspect the label.

If Dealer Mode is unavailable on your 2021 Ram 4500, the radio must be removed to read the serial label:

Turn off the vehicle.
Remove the surrounding bezel with a plastic pry tool. The 4500's work cab trim has friction clips – work from the lower edge to release.
Remove the mounting screws (Torx T20 or T25).
Pull the unit out to read the serial label on the top of the chassis.

Cables can remain connected while you photograph the serial.

Manufacturer Label Inspection

The factory radio in the 2021 Ram 4500 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.

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.
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.
Removal overview (2021 Ram 4500 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.
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.
Tips and professional advice: the 12-inch UAX/UBQ portrait head unit on the 4500 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.

Ram 4500 2021 radio serial number label location

Example: Ram 4500 serial number label location

Typical Radio Serial Prefixes and Formats

The 2021 Ram 4500 Uconnect 4C (RA4) serial number formats:

T00AM – Harman Uconnect 4C (most common prefix)
T00BE – Continental variant
T0MYD – Newer Harman production (2020+)

Radio designation: RA4 (Uconnect 4C, 8.4"). Serial: 14 characters. The Ram 4500 chassis cab uses the same infotainment hardware as the Ram 3500 and 5500.

Important The serial number is not the same as the part number (P05064... or 68...). Only the 14-char serial generates the code.

Standard Serial Number Patterns on This Radio

The factory radios fitted to the 2021 Ram 4500 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

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

Uconnect 3 / Uconnect 4 5-inch (UAG)

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.
Always copy the serial exactly as printed and avoid guessing characters that look unclear.

Locked 4500 Radio? Here's Exactly How to Get the Code

Skip long troubleshooting discussions or service visits - you can retrieve the code online with the radio serial number.
Start by finding your radio's serial. You will always find it on the unit itself, and sometimes it can be visible on the 4500's display.
Enter it into the generator above, and the software will calculate the correct 2021 4500 unlock code.
When you receive the code, type it in using 4500's radio controls to unlock the system fully.
The entire process takes just a short moment and requires no VIN, documents, or technical knowledge.

Entering Your Unlock Code

Once the system gives you 2021 Ram 4500 radio code from the serial number, you're ready to reactivate the radio.

Many drivers hesitate at this stage because input process can look different across radio versions, but it's usually quick.

When the radio shows ENTER CODE, it means the unit is waiting for the correct numbers.

Entering Process

To input the unlock code on the 2021 Ram 4500's Uconnect 4C:

The 8.4" screen presents "ENTER CODE" after a battery event.
Use the touchscreen keypad to enter each digit of the 4-digit code.
The radio auto-unlocks after the 4th digit – nothing else needed.

Lockout Warning: 3 wrong attempts = 60-minute lockout. Keep ignition ON. Turning off the ignition restarts the wait.

Detailed Input Instructions for Ram 4500 2021

Once the unlock code has been retrieved, the 2021 Ram 4500 Uconnect 4 head unit can be unlocked at the dash without a scan tool or dealer visit.

Limited Attempt Warning: Mopar/Uconnect head units only accept three incorrect tries before the radio enters a WAIT state. If the lockout activates, the radio must remain powered with the ignition in RUN for roughly 30 continuous minutes (the vehicle may be driven during this time) before another attempt is allowed. Repeated wrong-code lockouts can extend the wait significantly, so confirm every digit before pressing it.
Place the ignition in RUN/ACC so the radio powers up but the engine stays off.
Wait for the display to show CODE, Please enter Anti-Theft Code, or a similar prompt.
On the Uconnect 4C 8.4 (UAQ/UCQ) and 12-inch UAX, tap the on-screen number pad to enter each digit and confirm with the OK/Enter touch button.
On the 5-inch UAG base radio, use the numbered preset buttons (1-0) to key each digit of the code in sequence; confirm with the OK/Enter soft key if the unit prompts for it.
If WAIT appears after wrong attempts, leave the radio powered with the ignition in RUN for the documented cool-down period before trying the correct code again.

If a correct-looking code is rejected, double-check the radio serial that was used to retrieve the code, and that the VIN tied to the code matches the truck the radio is currently installed in - a VIN mismatch is the most common reason an apparently correct code is refused.

Understanding Unlock Issues with Your 4500

The Ram 4500's Uconnect 4C uses touchscreen-only code entry — tap each digit on the virtual number pad. No physical preset buttons are involved. The radio unlocks after the 4th digit.

A rejected code on the Ram 4500's Uconnect 4C usually means a serial number error. The RA4 label has both the serial (T00AM, T00BE, or T0MYD, 14 chars) and the part number (P05... or 68...) — only the serial generates the code.

Chassis cab labels may be hard to read. Clean the sticker or photograph it. Contact support for a free re-check if needed.

No code prompt means the Uconnect 4C isn't locked. Force the lock: pull the radio fuse and reinsert it, then turn ignition ON. The prompt appears on startup.

The Ram 4500's Uconnect 4C locks after 3 wrong entries. The screen continues to display "ENTER CODE" but ignores all input.

To reset: Keep ignition ON for a full 60 minutes. Turning off restarts the countdown. Commercial fleet vehicles must complete the full wait without interruption.

The Uconnect 4C serial on the Ram 4500 can be read via Dealer Mode (System Info → Radio Part Info → Serial Number) or on the physical label on the unit housing after removal. Serial: 14 chars starting with T00AM, T00BE, or T0MYD.

Do not use the part number (P05... or 68...) on the same label.