Why Did the Radio Lock and Ask for a Code?
The 2020 Chrysler 300 RA4 locks automatically after power is cut. The final-gen 300 uses the same anti-theft system — a disconnected radio won't work without the code.
Most common trigger: battery replacement or disconnect. Other causes:
- Blown fuse after electrical work
- Buying the 300 used without a known code
- Battery disconnect during service
- Battery drained from storage
Code is derived from the radio serial number — not the VIN.
Can't Locate Your Unit's S/N? Follow The Steps Below for Chrysler 300 2020
The useful fact to know is that factory radios use a unique serial number to identify each unit.
The anti-theft system matches the code directly to this serial.
Unlike car-specific data such as 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 a radio that you installed afterwards.
Depending on the manufacturer and radio installed in your Chrysler 300, the retrieval method is different.
These are the best ways to find it.
Radios Offered in the 2020 Chrysler 300
For 2020 the Chrysler 300 still uses the Uconnect 4 family. The same three head units are split across the trim ladder, with screen size and navigation being the main visual differences.
Uconnect 4 (UAG) is the 7-inch non-NAV touchscreen, standard on the entry 300 Touring trim. Visual ID: 7-inch screen sitting centrally with dash trim filling the rest of the bezel opening; Apple CarPlay and Android Auto are present, but there is no factory NAV/Map app.
Uconnect 4C (UAS) is the 8.4-inch non-NAV touchscreen. Common on Touring L and 300S without the navigation option. Visual ID: large 8.4-inch screen that fills the bezel opening, CarPlay and Android Auto supported, but no Map/NAV tile and no on-board maps.
Uconnect 4C NAV (UAQ) is the 8.4-inch with built-in GPS, standard on 300C and 300S Premium and frequently optioned on Touring L. Visual ID: identical 8.4-inch bezel and glass to UAS, but the home screen carries a dedicated NAV/Map tile and on-board maps work without a phone.
Easiest field check: 7-inch = UAG, 8.4-inch without a Map tile = UAS, 8.4-inch with a Map tile = UAQ.
Display-Based Serial Number Retrieval
These are the steps you should follow for 2020 Chrysler 300:
The 2020 Chrysler 300 — the final generation of Chrysler's full-size rear-wheel-drive sedan — comes with the Uconnect 4C (RA4) with an 8.4" touchscreen. Dealer Mode works differently from older RA3 models: press the bottom-left and bottom-right corners of the physical screen bezel frame simultaneously for 5 seconds (ignition ACC or ON). Dealer Mode opens. Navigate to: System Info → Radio Part Info → Serial Number.
Check the Display First - Serial Retrieval Without Tools
The 2020 Chrysler 300 continues to ship with Uconnect 4 hardware - 8.4-inch UAQ NAV, 8.4-inch UAS non-NAV, and the smaller 7-inch UAG. On most units the radio serial number can still be read straight from the touchscreen via the hidden dealer/diagnostic menu, though later Uconnect software builds may have restricted dealer-mode access on some cars.
Uconnect 4C 8.4 (UAQ / UAS)
Switch the ignition to RUN/ACC and wait for the Uconnect interface to finish booting. Press and hold the driver-side temperature UP, the driver-side temperature DOWN, and the front DEFROST buttons together for roughly 5-10 seconds. If the climate-button shortcut does nothing on a software-updated unit, press and hold the bottom-left and bottom-right corners of the screen at the same time for about 5-10 seconds. Browse to the radio/system info section to read the 14-character serial number on screen, and photograph the screen so the characters can be transcribed accurately.
Uconnect 4 7-inch (UAG)
Place the ignition in RUN/ACC and let the screen finish loading. Press and hold both temperature UP and temperature DOWN buttons together for around 5-10 seconds to open the engineering menu, then browse to System Info / Target Main Data to view the serial. Take a photo of the display before transcribing the digits.
Serial Number on the Unit
If the serial number cannot be accessed on-screen, use the removal method.
Most Chrysler 300 original radios include a tag with the serial number printed on the housing.
Steps:
- Power down the vehicle.
- Remove the dashboard frame surrounding the radio.
- Unscrew the clips.
- Move the unit forward to access the label.
The serial number is usually located near the manufacturer sticker.
If Dealer Mode is unavailable on the 2020 Chrysler 300, remove the RA4 unit from the 300's center stack. The bezel corner press sometimes fails after OTA firmware updates.
- Pry off the center stack trim with a plastic trim tool.
- Remove the 4 Torx T20 mounting screws.
- Slide the unit out to access the serial label on the side or back of the chassis.
Manufacturer Label Inspection
If dealer mode has been restricted on the 2020 Chrysler 300 by a Uconnect software update, the printed chassis label remains the next reliable source for the serial. The Uconnect 4 head unit on the LD-platform 300 is closely integrated with the climate cluster, so a careful, methodical removal is important.
Safety first. Turn the ignition off, remove the key, disconnect the negative battery terminal, and wait a few minutes before touching wiring. Avoid the yellow airbag/SRS connectors entirely and use plastic trim tools so nothing shorts or breaks.
Tools you will need. Plastic trim removal kit (a Mopar C-4755 trim stick or equivalent), Phillips and small Torx bit set, 7mm/10mm socket set, flashlight.
Removal overview. Pry the centre instrument panel bezel free with a plastic trim tool starting at the lower edge and working up the sides; on the LD 300 the bezel carries the A/C-heater control and clock connectors, so keep pressure even. Unplug those harnesses at the rear of the bezel, then set the trim aside. Remove the mounting fasteners (typically four screws, two upper and two lower) holding the radio cage to the support bracket, slide the radio rearward, and disconnect the antenna lead and the multi-pin power/data harness on the back.
Where the serial sits. The serial number is printed on a barcode/sticker label on the top or side of the radio chassis, next to the part number and supplier markings.
Tips. Photograph the label up close and double-check ambiguous characters such as 0/O, 1/I and B/8. If working around the airbag wiring or the integrated climate cluster is uncomfortable, have a professional installer remove the unit for you.
Example: Chrysler 300 serial number label location
S/N Patterns and Prefixes
Year Chrysler 300 RA4 serial formats:
T00AM– Harman RA4 Uconnect 4C (primary format on the 300)T00BE– Continental version
Serial is 14 alphanumeric characters. Ignore the part number (starts with P or 68).
How Serial Numbers Usually Look on These Chrysler 300 Radios
The factory radios on the 2020 Chrysler 300 use the standard Mopar/Uconnect serial style, with the exact prefix depending on the Uconnect tier and the supplier (Visteon, Continental, Harman or Panasonic) that built the unit.
Uconnect 4C 8.4 (UAQ / UAS)
The serial is typically a 14-character alphanumeric string printed on the chassis label. It commonly begins with T - frequent prefixes include T00AM, TM9 and TQ1 - or with A2C on Continental-built variants. The serial is usually a continuous run of letters and digits with no dashes or spaces.
Uconnect 4 7-inch (UAG)
The 7-inch UAG unit usually carries a Mopar/Harman or Panasonic-style serial on the chassis sticker; the label on the unit itself is the authoritative reference. Copy the serial exactly as printed and avoid guessing characters that look unclear.
How Code Entry Works on Your Chrysler Radio
When you obtain the correct unlock code based on the S/N, you can restore default functionality by entering it into the unit.
The code entry process depends on the control layout, but most 2020 300 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 SAFE displayed on screen.
In-depth Entering Instructions for 300 2020
To unlock the 2020 Chrysler 300 Uconnect 4C:
- Turn ignition to ON. Screen shows "ENTER CODE".
- Tap each digit of your 4-digit code on the touchscreen keypad.
- Radio unlocks after the 4th digit. No confirm button needed.
3 wrong attempts cause a 60-minute lockout. Keep ignition ON. Switching off restarts the timer.
Detailed Input Instructions for Chrysler 300 2020
Once the unlock code has been retrieved for a 2020 Chrysler 300 Uconnect head unit, it can be entered directly at the dash - no scan tool or dealer visit required.
Limited attempts. Mopar/Uconnect head units only accept three incorrect tries before the radio enters a WAIT state, so confirm every digit before pressing it.
Entering the code. 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/UAS), tap the on-screen number pad to enter each digit and confirm with the OK/Enter touch button. On the Uconnect 4 7-inch (UAG), press the numbered preset buttons in sequence (preset 1 = first digit, preset 2 = second, etc.) - or use the on-screen keypad when the unit prompts for it.
If a wrong code was entered. If WAIT appears after incorrect attempts, leave the radio powered with the ignition in RUN for a continuous 30 minutes (the vehicle may be driven during this time) before trying the correct code again.
How to Get Your 2020 Chrysler 300 Radio Code
Getting your radio code takes only a few simple steps.
- Find the radio's serial - this is the only information required by our side.
The difference with the dealership lookup is that no VIN is needed. - Enter the serial number into our generator above.
Our system checks it against a database of supported units and automatically retrieves the matching radio code. - In most cases, the code will appear instantly on the screen after you pay and is also sent to your email , just in case.
If manual verification is required (rare situations), you'll be notified before checkout. - When you get it, simply enter it into the radio to restore the functionality.
Understanding Unlock Issues with Your 300
If the 300 screen boots normally, anti-theft is inactive. Force the prompt: briefly pull the radio fuse, reconnect, turn ignition to ON.
On the 300 RA4 label: serial = 14 alphanumeric chars starting with T00AM or T00BE. Part number starts with P or 68 — not the serial.
3 wrong entries lock the 300 RA4 for 60 minutes. Keep ignition in ON or ACC. Cutting power restarts the timer from zero.
The 300 RA4 label carries both serial and part number. Serial: 14 chars starting with T00AM or T00BE. Part number (skip): starts with P or 68.
If Dealer Mode was used, verify against the physical label. Screen glare on the 8.4" can cause misreads. Contact support for a free re-check if needed.
The 300 Uconnect 4C uses touchscreen-only code entry. Tap each digit directly on the on-screen keypad. No physical buttons needed. Confirms after the 4th digit.