Chevy, GMC or Buick Radio Says LOCKED? What It Means and How to Fix It

A GM radio showing LOCKED is not asking for a code - it no longer matches the car VIN. Here is how to tell which lock you have, the 5-minute fuse fix from GM's own bulletin, and what to do when that is not enough.

By Uros Radovanovic, Automotive Electronics Specialist
June 27, 2026 Updated: October 5, 2026

GM Delphi Electronics Chevrolet VIN-locked radio showing Locked on screen

Quick answer: A Chevy, GMC or Buick radio that says LOCKED is not asking for a code. It no longer matches the car VIN. Pull the radio fuse for 5 minutes first - that is GM's own interim fix in bulletin PIC6111C. If it stays locked, a dealer or a shop with GM programming software has to relearn the VIN or replace the radio. Older 1994-2002 Delco THEFTLOCK radios that show LOC are different: they take a code that an owner programmed.

What This Guide Covers

If your Chevrolet, GMC or Buick radio suddenly shows LOCKED on the screen, you are probably hunting for an unlock code - but for these radios there is no code to find. These units are built by Delphi Electronics and are VIN-locked, not protected by the usual 4-digit anti-theft code. This guide explains what LOCKED really means, how to tell whether your radio wants a code or is VIN-locked, and the two methods owners use to get a LOCKED GM radio working again. Because there is no code to sell you here, the official routes are worth knowing: Chevrolet Support and GMC Support both carry infotainment and security help plus a support request form.

What Does "Locked" Mean on a GM Radio?

On most cars a radio that loses power asks for a CODE. GM Delphi radios are different. When they lose their VIN link - after a battery change, a dead battery, or being moved to another car - they show "Locked" and stop working. There is no PIN that unlocks them. The radio is tied to the car VIN, so it has to be re-programmed with a dealer or locksmith diagnostic tool, or physically reset. That is why searching for a "Chevy radio unlock code" turns up nothing that works.

Is Your Radio VIN-Locked, or Just Asking for a Code?

Before you do anything, work out which problem you actually have. They are fixed in completely different ways:

Screen says LOCKED (no place to type numbers): this is a VIN-locked GM Delphi radio. No code exists. Use one of the methods below or a diagnostic tool.
Screen says CODE, ENTER CODE or shows a keypad: this radio wants a serial-based unlock code. That is recoverable - most brands can be unlocked instantly from the serial number.

In short: LOCKED = VIN-locked, no code. CODE = a code you can recover. If yours asks for a code, skip the methods below and check your serial number instead.

LOC, LOCKED or CODE? The Three GM Radio Lock Types

GM has used different anti-theft systems over the years, and the word on the screen tells you which one you have. Match your display to one of these before you try any fix:

LOC or InOP - Delco THEFTLOCK (1994-2002)

Delco radios with the THEFTLOCK logo on the faceplate, fitted to GM vehicles from 1994 to 2002, lock with a code that an owner programmed - the feature only switches on when someone sets one. LOC means a code is stored and the radio is locked: enter it with the HR and MIN buttons and press AM/FM. If nobody knows it, hold presets 2 and 3 for about 6 seconds, then press AM/FM, to read a 6-digit scrambled code. An authorized GM electronic service center can turn that into a back-up code (GM notes not every code can be retrieved and a fee may apply). InOP means too many wrong codes: keep battery and ignition power on continuously for over an hour before trying again.

LOCKED or THEFT LOCK - VIN-learning radios

Later GM radios learn the car VIN. In a bulletin for 2007-2009 GM trucks and SUVs, GM explains how: the radio compares the VIN it has stored with the VIN the body control module sends over the vehicle network, and disables itself when they do not match. A radio swapped in from another vehicle has to relearn the VIN through GM's Service Programming System (SPS). There is no code to type in. Start with the 5-minute fuse power cycle below; if that fails, it is a programming job.

CODE or a keypad - not the GM VIN lock

If the screen asks you to enter a CODE and the radio is not a 1994-2002 Delco THEFTLOCK unit, it is not using the VIN lock described here. Radios that take a code worked out from their serial number - for example a replacement unit from another brand - can be checked with the form further down. It tells you instantly whether we can generate the code.

GM Bulletin PIC6111C: "Radio Is Theft Locked" on 2015-2016 Models

GM knew about this one. In March 2016 it issued Preliminary Information PIC6111C, "Radio Is Theft Locked" to US dealers, for cars where the owner or a technician reports that the radio is theft or VIN locked. It applies to radios with the option codes (RPO) UFU, UP9, UHQ, UHK, UFW, UHR, UHJ or UFF in these models:

Buick: Encore and Verano (2015-2016), Cascada (2016)
Chevrolet: Cruze, Equinox, Malibu, Caprice, Orlando and SS (2015-2016), Camaro and Volt (2015)
GMC: Terrain (2015-2016)

GM's fix, step by step

Find the radio fuse in the fuse table of your owner's manual. The fuse box location and the fuse number differ by model.
Switch the ignition off and pull that fuse.
Leave it out for 5 minutes. That is the power cycle GM specifies.
Refit the fuse, turn the ignition on and check the radio.

If the radio works again, GM told dealers to release the car and let the owner know a permanent fix was coming. That fix came in September 2016: service bulletin 16-NA-290 replaced PIC6111C, says the message is the result of an internal radio concern, and tells dealers to replace the radio with an improved unit. To check whether your radio has one of the listed option codes, look at the Service Parts Identification label inside the glove box, if your car has one.

Method 1 - Fuse Reset (Try This First)

If the radio is the original unit from the car, the simplest fix is sometimes pulling the radio fuse for a few minutes to force a reset. It does not always work, but it is free, risk-free and worth trying before anything drastic. Find the radio fuse in your owner manual, remove it, wait, and refit it. These two videos show the process on common Chevy models:

Buick and Chevy Models: Which Fix Applies

Most people search for this by model, so here is the short version for the cars people ask about most. The model years below are exactly as GM lists them in its bulletins; any other year follows the general VIN-lock path.

Buick Encore

The 2015 and 2016 Encore are in both PIC6111C and 16-NA-290. Owners often report LOCKED after a dead battery or a jump start. Try the 5-minute radio fuse power cycle first. If LOCKED comes back, the dealer route for these years is a replacement radio under 16-NA-290 - not a code.

Buick Verano

The 2015 and 2016 Verano are covered by the same two bulletins, so the path is the same as the Encore: fuse power cycle first, then the dealer with bulletin 16-NA-290 if it locks again.

Buick Enclave, LaCrosse, Lucerne and LeSabre

These are not in the 2015-2016 bulletins, so go by the screen. A Buick up to the 2002 model year (a LeSabre, for example) with a THEFTLOCK logo radio that shows LOC is on the owner-code system above. A Buick that shows LOCKED or a theft-lock message is VIN-locked: try the fuse power cycle, then have the VIN relearned with GM programming software.

Chevy Cruze

The 2015 and 2016 Cruze are in the bulletin. The fuse power cycle is the first step, and the 2015 Cruze LT video in Method 1 shows it on the car. If the radio locks again, take bulletin 16-NA-290 to the dealer.

Chevy Equinox and GMC Terrain

The 2015-2016 Equinox and the 2015-2016 Terrain are both in the bulletin. Fuse first; the Method 1 video shows the fuse pull on an Equinox, and the Method 2 video covers the EEPROM route on 2017-2020 Equinox radios.

Chevy Malibu

PIC6111C lists the 2015-2016 Malibu; the later 16-NA-290 names the 2015 Malibu and the 2016 Malibu Limited. The order is the same: 5-minute fuse power cycle, then the dealer with the bulletin number.

Method 2 - EEPROM Removal (Advanced, Risky)

If the fuse reset does not help, the other route owners use is removing and resetting the EEPROM chip inside the radio. This is an advanced electronics repair that involves opening the unit and working with a soldering iron.

This is an extreme, high-risk method. Done wrong it permanently kills the radio. Only attempt it if you are comfortable with electronics soldering, or have a specialist do it for you. These videos walk through it:

More radio tutorials on our YouTube channel

Is There a GM Radio "Bypass" or Unlock Code?

No. A VIN-locked GM radio has no master code and no button sequence that unlocks it, and anyone selling a "Chevy radio unlock code" for a LOCKED screen cannot deliver one that works. What gets called a bypass online is one of two things: the fuse power cycle, or rewriting the memory chip (EEPROM) that stores the learned VIN, as in Method 2. Chip work only applies to particular radios, needs soldering and an EEPROM programmer, and one mistake leaves the radio permanently dead. The legitimate route is a VIN relearn - or, for the 2015-2016 models in bulletin 16-NA-290, a replacement radio.

How to Unlock a GM Radio Without a Tech 2

The Tech 2 is GM's older scan tool. GM's own tool guide lists Tech2Win software (the Tech 2 as a program) for 1996-2013 vehicles and GDS2 for 2010 and newer, with 2010-2013 models split between the two. So for a 2014 or newer Encore, Cruze or Equinox, a Tech 2 was never the right tool. Your options without one:

Fuse power cycle. Pull the radio fuse for 5 minutes. It is GM's own first step and needs no tools.
An independent shop or mobile programmer. GM licenses its diagnostic and programming software to non-dealers through ACDelco, run on an MDI 2 or a J2534 pass-through device. Ask whether they can do a radio VIN relearn through SPS on your model.
A dealer. For the 2015-2016 models in bulletin 16-NA-290, the dealer fix is a replacement radio rather than a relearn.

When to Use a Dealer or Diagnostic Tool

If neither method works, the proper fix is to re-link the radio to the car VIN with a GM diagnostic tool. A dealer or an auto-electrician with the right scanner can do this. It is the only guaranteed route for a genuinely VIN-locked Delphi unit, and it is worth getting a quote before spending money on a replacement radio.

Does Your Radio Ask for a CODE Instead?

VIN-locked GM radios need a diagnostic tool - but if your radio shows CODE or a keypad, that is a different system we can unlock instantly from the serial number, from $9.99. Check your serial and find out in seconds.

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Frequently Asked Questions

The Encore radio is VIN-locked, and owners often report LOCKED after a power interruption such as a dead battery or a jump start. On 2015-2016 Encores, GM traced the theft-locked message to an internal radio concern. Its interim fix (bulletin PIC6111C) is a 5-minute radio fuse power cycle, and its permanent fix (bulletin 16-NA-290, September 2016) is a replacement radio. There is no code to enter.

First pull the radio fuse for 5 minutes and refit it - that is GM's own first step in bulletin PIC6111C and needs no tools. If the radio still says LOCKED, it has to relearn the VIN through GM programming software. Tech 2 (Tech2Win) is GM's tool for 1996-2013 vehicles, while 2010 and newer vehicles use GDS2 and SPS, so a 2014 or newer car never needed a Tech 2. Independent shops can license GM software through ACDelco and run it on an MDI 2 or J2534 device, so the dealer is not the only option.

No. GM Delphi radios that display "Locked" are VIN-locked, not code-locked. There is no 4-digit PIN to enter. They have to be reset with the fuse or EEPROM method, or re-programmed to the VIN with a diagnostic tool. Any site selling a "Chevy unlock code" for a Locked screen cannot deliver a working one.

The radio is tied to the car VIN. When it loses constant power - a dead or replaced battery, or disconnected terminals - it loses that link and shows Locked as an anti-theft measure. Unlike a normal radio code, it will not simply accept a PIN to come back.

On a 1994-2002 Delco radio with the THEFTLOCK logo, LOC means the radio is locked and an owner-programmed code is stored in it. Enter that code with the HR and MIN buttons and press AM/FM. If the code is lost, hold presets 2 and 3 for about 6 seconds and then press AM/FM to read a 6-digit scrambled code, which an authorized GM electronic service center can turn into a back-up code. InOP means too many wrong tries: keep battery and ignition power on for over an hour before trying again.

Not always. The fuse reset works on some original-to-the-car units and is the easiest thing to try first, but many Locked Delphi radios need the EEPROM reset or a VIN re-program with a diagnostic tool. It costs nothing to try the fuse first.

No - and we will not sell you one, because no working code exists for a VIN-locked GM Delphi radio. We only retrieve codes for radios that genuinely ask for a serial-based code (Honda, Acura, Ford, Uconnect and many others). If your screen says CODE rather than Locked, check your serial number and we can likely help.

If the car has had its radio replaced or swapped from another vehicle, a fuse reset is far less likely to work because the unit is bound to a different VIN. Original-to-the-car radios respond best to the fuse method. A used or swapped Delphi unit usually needs a diagnostic re-program.