Which factory radio does the 2018 Ram 2500 have?
Even for a single year, the 2018 Ram 2500 could leave the factory with more than one head units. Pick the unit that looks like yours.
How Serial-Based Ram 2500 Radio Unlock Works
- Instead of contacting Ram dealer or searching forums you can generate the code online with the radio S/N.
- Identify the serial number. The best place to search is on the unit itself, and sometimes you can see it on the 2500's display.
- Enter it into the generator above, and our system will calculate the correct 2018 2500 unlock code.
- After getting it, input it using 2500's radio buttons to unlock the system fully.
- The entire process takes just a short moment and requires no VIN, documents, or technical knowledge.
Serial Number Location Guide for Ram 2500 2018
The first step is writing down the radio serial number.
Most drivers assume the code depends on the Ram model or year, but in reality, the whole process depends on the unique radio unit's serial number.
Each radio has its own serial tied to the security system.
This is actually better, because if you have bought a used radio, the VIN or other vehicle-specific data wouldn't help.
Based on the radio used, you can see the serial directly from the display or by checking the label on the radio chassis.
Factory Radios on the 2018 Ram 2500
The 2018 Ram 2500 is the final model year of the 4th-generation HD truck before the 2019 redesign, and the radio fleet remains the same Uconnect family that has been on offer since 2013. Four head units were available, depending on trim and option boxes.
- Uconnect 3.0 / RA1 - base AM/FM/CD radio on fleet Tradesman builds. Small monochrome strip display, hard knobs, no touchscreen.
- Uconnect 5.0 / RA2 - 5-inch colour touchscreen, common on Tradesman and entry SLT. AM/FM, Bluetooth, USB and aux. No CD slot, no NAV button.
- Uconnect 8.4 / RA3 - 8.4-inch landscape touchscreen, optional on SLT and standard on Laramie. Capacitive shortcut row across the bottom of the display, no Nav tile on the home screen.
- Uconnect 8.4N / RA4 - same 8.4-inch hardware as the RA3 with the Garmin-based navigation database enabled. A Nav tile sits on the home screen and a SiriusXM Traffic/Travel Link badge appears at startup. Standard on Longhorn, optional on most other trims.
Quick tell: no screen = RA1; 5-inch screen = RA2; 8.4-inch screen with no Nav tile = RA3; 8.4-inch screen with a Nav tile = RA4. The sales code is printed on the label on top of the radio chassis.
Find the S/N on the Radio Screen
These are the steps you need to follow for 2018 Ram 2500:
The 2018 Ram 2500 heavy-duty truck features the same Uconnect infotainment system as the Ram 1500. Depending on trim level, you'll find a Uconnect 3.0/5.0" (base trims) or Uconnect 8.4" (higher trims).
For 8.4" Uconnect (RA3): Press and hold the Climate Up, Climate Down, and Front Defrost buttons simultaneously for 5 seconds to launch Dealer Mode. Then go to: System Info → Radio Part Info → Serial Number.
For base Uconnect: Dealer Mode is not supported. Removing the radio is required to read the serial label.
Read the S/N From the Radio Display
For 2018 Ram 2500 trucks fitted with the 8.4-inch Uconnect, the unit supports a hidden dealer/diagnostic menu that displays the radio's internal serial number on screen - much faster than dropping the head unit out of the dash. The smaller RA1 and RA2 radios do not have a reliably documented on-screen serial readout for this generation.
Uconnect 8.4 (RA3) and Uconnect 8.4N (RA4)
- Place the ignition in the RUN position so the 8.4-inch touchscreen is fully booted.
- Press and hold the driver's temperature UP, temperature DOWN and front DEFROST buttons together for around 7 seconds.
- When the dealer/diagnostic menu opens, choose the radio-information entries near the top of the list - they list serial numbers, hardware/software revisions and similar identifiers.
- Note the full serial exactly as printed, including any leading letters such as
T00AMorTM9. - Press Done, or cycle the ignition off/on, to leave the menu.
Uconnect 5.0 (RA2) and Uconnect 3.0 (RA1)
- An equivalent on-screen serial-number readout for these smaller radios is not consistently documented.
- If the dealer-mode shortcut does not surface a serial entry, the chassis-label method is the dependable fallback.
Taking Out the Radio to View the S/N on the Tag
If the serial number cannot be accessed through menu, use the removal method.
Most Ram 2500 OEM radios include a tag with the serial number printed on the casing.
Step-by-Step Approach:
- Switch off the vehicle.
- Detach the dashboard frame surrounding the radio.
- Release the clips.
- Slide the unit forward to access the label.
The serial number is usually located near the manufacturer sticker.
To remove the radio from the 2018 Ram 2500:
- Switch off the vehicle and disconnect the negative battery cable as a precaution.
- Remove the center stack trim bezel using a plastic pry tool. Ram heavy-duty trucks may have sturdier trim pieces than the 1500.
- Unscrew the four Phillips mounting screws securing the radio to the dash bracket.
- Ease the radio out and locate the serial label on the side or top of the unit.
HD Truck Note: Commercial trims of the 2018 2500 may have a stripped-down center stack that makes radio access quicker than higher trims.
Taking Out the Radio to View the S/N
If the on-screen method is unavailable, or the radio is locked at the CODE prompt and you cannot reach the dealer menu, the printed chassis label is the most reliable source for the serial number on a 2018 Ram 2500.
Safety preparation
- Turn the ignition fully off and remove the key.
- Disconnect the negative terminal of the 12V battery.
- Wait several minutes before working near the dash so airbag circuits can fully discharge.
- Avoid pulling on yellow airbag wiring while removing trim.
Tools to have ready
- Plastic trim/panel pry tools to release the bezel without marks.
- A T20 Torx driver for the bezel screws hidden behind the rubber beauty plates at the top of the bezel.
- A Phillips driver for the two screws inside the lower console cubby (if your truck has the centre floor console).
- A 7 mm socket or driver for the four radio retaining screws.
- A phone/camera to photograph the chassis label clearly.
Removal overview
- At the top of the dash bezel, lift the rubber RAM-branded beauty plate with a fingernail or plastic pick to reveal two T20 Torx screws and back them out.
- Lift the rubber pad inside the cubby above the centre HVAC vents to reveal a single T20 screw and remove it.
- If the truck has the centre floor console, lift the rubber pad at the front of the console well and remove the two Phillips screws underneath.
- Starting at a lower edge, gently pry the bezel outward; it is held by retaining clips. Walk the tool around the perimeter to release each clip.
- Pull the bezel forward and unplug any small switch/HVAC connectors on its back.
- Undo the four 7 mm screws now visible at the corners of the radio chassis.
- Slide the head unit out and unplug the main wiring harness and antenna lead.
Where the serial sits
- Look for a printed label on the metal housing - typically on the top or side face of the chassis.
- Copy the long alphanumeric string next to the barcode and double-check ambiguous characters (O vs 0, I vs 1).
Tips
- Photograph the label so the serial is preserved as a permanent reference.
- Reinstallation is the reverse: harnesses on, four 7 mm screws home, bezel pressed in until each clip seats, T20 and Phillips screws restored, then reconnect the battery.
Example: Ram 2500 serial number label location
Serial Number Format Guide for 2018 Ram 2500
The 2018 Ram 2500 uses the same radio hardware as other Ram trucks. Serial number prefixes:
T00AM– Harman Uconnect (standard prefix)T00BE– Continental Uconnect variantTM9– Older Harman productionT0MYD– Recent Harman units (later model years)
The 2018 2500 may have: RA2 (4.3" base), RA1 (5.0"), RA3 (8.4" Classic), or RA4 (8.4" 4C, newer). Serial is 14 characters.
Reminder Your serial number starts with a code prefix (T00AM, T00BE, etc.) – don't mistake it with the radio part number (starts with P05064 or 68).
Typical Serial Number Examples on This Truck
The 2018 Ram 2500 could leave the factory with several different Uconnect head units, each from a different supplier, so the serial-number format depends on which radio is in your truck. The patterns below are the ones most often reported for this generation.
Continental-supplied Uconnect 8.4 (RA3 / RA4)
- Often start with a
T00AMprefix followed by a numeric tail, for example a string resemblingT00AM1234567. - The prefix is printed inline with the rest of the serial on the chassis label.
Panasonic-supplied Uconnect units
- Frequently start with
TM9followed by additional digits or letters. - This pattern has been widely associated with Panasonic-built Mopar radios from the Uconnect 8.4 era.
Uconnect 5.0 (RA2) and Uconnect 3.0 (RA1) base radios
- Also carry a printed serial label on the chassis, but the prefix can vary by supplier batch.
- Read the full string off the label rather than assume a fixed format.
If the alphanumeric you read does not fit any of these patterns, double-check that you have copied the serial line and not the part number. The serial is normally the longest string on the label and is the one tied to the barcode.
Final Step - Enter the Radio Code
Once you receive the correct unlock code based on the serial number, you can restore normal functionality by entering it into the unit.
The code entry process depends on the radio interface, but most 2018 2500 systems follow a similar structure using preset buttons, touch controls, or rotary knobs - depending on if it's a factory or an aftermarket unit.
You will typically see CODE displayed on screen.
Step-by-Step - Correct Entering Process
To type in the unlock code on the 2018 Ram 2500:
- Turn ignition to ON. The radio display shows "ENTER CODE" or "CODE".
- Touchscreen models (8.4" Uconnect): Tap the on-screen keypad to enter each digit of the 4-digit code.
- Non-touchscreen (base Uconnect): Press preset buttons 1-4 to select each digit, then press Enter/OK to confirm.
Lockout: 3 wrong attempts = 60-minute lockout. Ignition must stay ON. Commercial vehicles that frequently have battery service may experience this lock more often.
Step-by-Step Code Input on the 2018 Ram 2500
Once the correct anti-theft code for your 2018 Ram 2500 radio is in hand, entry is fast - but the radio will lock you out for half an hour if you keep guessing, so verify the code before you start.
Limited Attempt Warning
Only three attempts are allowed. Three wrong codes in a row send the radio into a WAIT state and the display reads WAIT. To clear it, the radio must remain powered with the ignition in RUN for a continuous 30 minutes. Switching the key off does not shortcut the timer (the truck may be driven during this time).
Entering the code
- Turn the ignition to RUN or ACC so the radio powers up and shows the CODE / Anti-Theft prompt.
- On the 8.4-inch Uconnect (RA3/RA4), tap each digit on the touchscreen number pad.
- On the 5-inch Uconnect 5.0 (RA2), enter the digits using the on-screen keypad.
- On the base Uconnect 3.0 (RA1), enter the four-digit code using the preset (1-6) buttons in sequence.
- Confirm with the OK/Enter on-screen control or the equivalent hardware button.
- When accepted, the radio returns to the normal home screen and audio resumes.
If it does not unlock
- Stop after the second wrong attempt and re-verify the serial used to obtain the code.
- Make sure no leading letters or trailing digits were dropped from the serial.
- If
WAITappears, leave the radio powered for the full 30 minutes before retrying.
Why Did the Radio Lock and Ask for a Code?
Uconnect self-locks after any power interruption. HD Ram trucks are particularly prone to this because batteries are replaced as part of regular fleet maintenance.
Common causes:
- Battery replacement — by far the top cause
- Failed fuse — common after PTO installation
- Buying the truck fleet without the code
- Battery fully drained from seasonal downtime
The code is derived from the radio's serial number — not the truck's VIN.
Troubleshooting Common Radio Problems - 2500 2018
The Uconnect enters lockout after 3 wrong entries. The display still shows "ENTER CODE" or "CODE" but won't register all input.
To reset: Ignition ON, 60 full minutes without turning off. Fleet-managed heavy-duty trucks used in rotation must finish the full wait in one sitting. Turning off the ignition restarts the 60-minute timer.
HD Ram trucks have a mix of radios (RA1/RA2/RA3/RA4 depending on trim and year). Each unit's label includes both the serial (14 chars: T00AM, T00BE, TM9, or T0MYD prefix) and the part number (P05... or 68...). Only the serial generates the unlock code.
Base trim radios often have hard-to-read labels. Wipe it down before reading, or photograph it and zoom in to check every digit.
HD Ram radios may have the serial accessible via Dealer Mode (8.4" RA3: hold Climate Up + Climate Down + Front Defrost 5 sec; then System Info → Radio Part Info → Serial Number) or on the physical label on the unit housing.
Serial: 14 chars starting with T00AM, T00BE, TM9, or T0MYD. Don't confuse this with the part number (P05... or 68...).
No code prompt means the lock hasn't activated. To force the code screen: briefly disconnect the battery, then restore power and turn ignition ON. The "ENTER CODE" screen shows on startup.
HD Ram code entry varies by radio trim: 8.4" Uconnect (RA3/RA4) uses touchscreen-only entry — press each digit on the virtual number pad. Base Uconnect (RA1/RA2) uses preset buttons 1–4 to cycle each digit, then Enter/OK to confirm.