What Caused the Radio to Lock?
The Ram 2500's Uconnect 4C activates anti-theft after any power interruption. HD Ram 2500 owners encounter this primarily due to:
- Battery replacement — the most common trigger. HD trucks put more demand on batteries, making battery replacements more frequent.
- Fleet service battery swaps — work trucks undergo regular battery service.
- Blown fuse — common after aftermarket work.
- Buying fleet-retired without a known unlock code.
The code is derived from the radio's serial number — not the VIN.
How to Find the Serial Number on Your 2023 Ram 2500 Radio?
The important thing to know is that factory radios use a unique S/N to identify each unit.
Your security system links the code directly to this serial.
Unlike vehicle-specific data such as VIN or registration info, it is not determined by the model or production year, so you'll be able to get it even if you have a radio that you bought afterwards.
Depending on the manufacturer and radio installed in your Ram 2500, the retrieval method is different.
Here are the most reliable ways to find it.
Which Head Unit Is in Your 2023 Ram 2500?
For 2023 the Ram 2500 runs the Uconnect 5 infotainment platform as standard across SLT and above (with Uconnect 4 retained on the very base Tradesman/base Chassis Cab in some markets). Uconnect 5 introduced wireless Apple CarPlay and Android Auto, five user profiles and a much faster processor compared with the Uconnect 4 hardware it replaced.
Uconnect 3 / Uconnect 4 (sales code UAG) - 5-inch base touchscreen, retained on the lowest Tradesman/base Chassis Cab build only. Visual ID: small 5-inch screen with conventional climate controls below.
Uconnect 5 with 8.4-inch display (sales code UBL) - 8.4-inch landscape touchscreen with wireless Apple CarPlay and Android Auto, optional GPS navigation. Visual ID: 8.4-inch glass with the Uconnect 5 home grid (multiple user profiles, large widgets) instead of the older Uconnect 4 tile layout.
Uconnect 5 NAV with 12-inch display (sales code UBQ) - 12-inch portrait touchscreen with built-in GPS, wireless Apple CarPlay and Android Auto. Standard on Limited and optional/standard on Laramie depending on the build. Visual ID: large vertical 12-inch glass with split-screen and the Uconnect 5 interface.
Quick test for 2023: a 5-inch screen with the older Uconnect interface means UAG, an 8.4-inch landscape screen with the new Uconnect 5 home grid means UBL, and a tall 12-inch portrait screen running Uconnect 5 means UBQ.
View the Serial Number via the Radio Display
These are the steps you need to follow for 2023 Ram 2500:
The 2023 Ram 2500 heavy-duty 3/4-ton truck features the Uconnect 4C (RA4) 8.4" touchscreen fitted in the work-capable interior. The serial number is accessible 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 approximately 5 seconds.
- Dealer Mode appears on the display.
- Navigate to: System Info → Radio Part Info → Serial Number.
Note On some 2023 Ram 2500 units, Dealer Mode may be restricted after a software update. If the bezel press doesn't respond, physical radio removal is the fallback.
Access the Serial by Pulling Out the Radio
If the serial number cannot be accessed on-screen, use the removal method.
Most Ram 2500 original radios include a tag with the serial number printed on the housing.
Process details:
- Ensure the ignition is off.
- Lift away surrounding dashboard trim.
- Loosen screws holding the radio.
- Slide outward to inspect the label.
If Dealer Mode is unavailable on your 2023 Ram 2500, the RA4 radio must be removed to access the serial label:
- Turn off the vehicle.
- Pry off the center stack trim using a plastic pry tool. The 2500 HD's dash can include thicker trim pieces than the 1500. Apply even pressure to release the friction clips.
- Unscrew the mounting screws (Torx T20 or T25) securing the radio.
- Pull the unit forward to access the serial label on the top surface of the chassis.
Cables don't need to be unplugged while you photograph the serial.
Ram 2500 Hardware Label Method
The factory radio in the 2023 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.
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 (2023 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.
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 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.
Example: Ram 2500 serial number label location
Typical Serial Number Examples for 2023 2500
The 2023 Ram 2500 Uconnect 4C (RA4) serial number formats:
T00AM– Harman Uconnect 4C (most common prefix)T00BE– Continental versionT0MYD– Updated Harman units (2020+)
Radio designation: RA4 (Uconnect 4C, 8.4"). Serial: 14 characters alphanumeric. The Ram 2500 HD upgraded to Uconnect 4C with the 2019 redesign.
Important Don't confuse the serial with the part number (P05064... or 68...). Only the 14-char serial generates the code.
S/N Patterns and Prefixes
The factory radios fitted to the 2023 Ram 2500 are predominantly Uconnect 5 head units (with Uconnect 4 retained on the base 5-inch UAG only). The serial style follows the standard Mopar/Uconnect convention, with the exact prefix driven by the supplier and software build of the specific unit, so any pattern below should be treated as a guide rather than a strict rule.
Uconnect 5 8.4-inch (UBL) and 12-inch (UBQ)
Typically a 14-character alphanumeric string printed on the chassis barcode label.
Often begins with T (for example T00-prefixed Mitsubishi Electric builds) or with A2C on Continental-built modules.
Printed as a continuous run of letters and digits, with no spaces or dashes.
Uconnect 3 / Uconnect 4 5-inch (UAG, base only)
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.
Copy the serial exactly as printed and avoid guessing characters that look unclear.
Steps to Unlock Your 2023 Ram 2500 Radio
Car radios use security codes dependent on the radio unit itself rather than the model or production year.
- Our lookup service works by matching your Ram 2500 radio's serial number.
- When you input the serial into the generator, the system identifies the radio family and generates the code that you need.
- Simply input the digits into the 2500 stereo.
- The online process is quicker and more accessible than visiting the Ram dealer.
Got the Code? Here's How to Enter It
Once the system gives you 2023 Ram 2500 radio code from the serial, you're ready to reactivate the radio.
Some drivers get stuck at this stage because input methods 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.
Step-by-Step - The Correct Way to Enter It
To input the unlock code on the 2023 Ram 2500's Uconnect 4C:
- The 8.4" screen shows "ENTER CODE" after a battery event.
- Tap the touchscreen keypad to enter each digit of the 4-digit code.
- The radio restores after the 4th digit – nothing else needed.
Lockout Warning: 3 wrong attempts = 60-minute lockout. Keep ignition ON. Turning off restarts the wait. HD work trucks must complete the full wait without interruption.
Understanding Unlock Issues with Your 2500
The Uconnect 4C serial on the Ram 2500 can be read via Dealer Mode (System Info → Radio Part Info → Serial Number) or on the barcode sticker on the unit housing after removal. Serial: 14 chars starting with T00AM, T00BE, or T0MYD.
Ignore the part number (P05... or 68...) on the same label.
The Ram 2500's Uconnect 4C uses touchscreen-only code entry — tap each digit on the virtual number pad. No physical preset buttons are used. The radio auto-unlocks after the last digit.
The Ram 2500's Uconnect 4C locks after 3 wrong entries, showing "ENTER CODE" but ignoring all input during the lockout.
To reset: Keep ignition ON for a full 60 minutes. Any power loss resets the timer. Fleet-managed 2500s used in rotation must complete the full 60-minute wait in one sitting.
No code prompt means the Uconnect 4C isn't activated. To force the code screen: pull the radio fuse and reinsert it, then turn ignition ON. The prompt appears on startup.
A rejected code on the Ram 2500's Uconnect 4C usually means the wrong serial was submitted. The RA4 label has the serial (T00AM, T00BE, or T0MYD, 14 chars) and the part number (P05... or 68...) — only the serial generates the code.
Work truck labels may be hard to read. Wipe down the label or photograph it and zoom in. Contact support for a free re-check if needed.