Can't Start Truck At All - Service Theft Deterrent System

[Bandit33x]

2015 GMC Sierra 1500 SLT - 82,000 Miles - Original Owner Bought New Off Lot

 

Was having some issues with the headlights turning on so I disconnected the ground cable from the battery to clean the connections for the HID system since wiggling it always fixed it before so I figured it was a bad wire or connection.  After reconnecting the battery, Service Theft Deterrent System popped up and haven't been able to start it. - Never had this happen before.

 

Have tried the following:

Different Key - No Change

New Key Fob Battery - No Change

Disconnecting both Battery Cables for a few hours - No Change

Disconnecting battery cables and touching + & - together for about a minute - No Change

Reset 2015 GMC Sierra Theft Deterrent System Steps - No Change

Unlock the driver's side door with the key and then lock it, and then unlock it again and the system should be cleared.

Use Remote Start - Doesn't work

Turn off and back on multiple times - No Change

 

Reset Theft Deterrent Mode Steps (Similar steps from multiple Threads) - No Change (One Note: My Theft Deterrent Light Never goes off)

• Insert ignition key.

• Turn it to the on position.

• Attempt to start the engine. ...

• Leave the key in that position until the security light stops flashing. ...

• Once the light goes off, switch the ignition key to off.

• Wait about five seconds.

• Try to start the engine again.

Repeat up to 2 more times - No Change

 

Insert ignition key and turn to the “ON ” position. Do not attempt to start the engine. Leave the key in the “ON ” position for approximately 11 minutes. The security light will be steady on or flashing for the 11-minute period. - No Change

 

Any help would be appreciated.  Luckily it's at home and in the garage (After pushing it in. LOL) since it happened in my driveway.

 

 

 

[discgolf01]

Since you already tried disconnecting the battery and it didn't work, what about leaving battery connected but pulling the appropriate fuse?

 

Back on my previous 2005 Silverado, I had something similar happen where the theft deterrent would turn the engine over, but I think was killing the fuel pump so it would never fired up - is that what the 2014-2019s do as well?

 

 

[Bandit33x]

I’ve looked for a fuse that relates to the security system and have been unable to find it. 

[Snowcamo]

Try disconnecting that very ground for the lights again. Then try to start.

[Bandit33x]

I tried disconnecting both positive and negative cables of the HID system and leaving them off while trying to start and still didn’t work.  
 

Checked all fuses related to BCM, pulled and tested with meter and reinstalled. 
No Change

[CamGTP]

Probably are going to need a scan tool at this point to try and reset the VATS system.

[Mary Beth]

We are having the same problem what ended up working for you?

[mikeyk101]

1 hour ago, Mary Beth said:

We are having the same problem what ended up working for you?

Any chance you are using a Range AFM Disabler plugged in to the OBDII port? I ask because I had a no start issue twice last year. I had an older Range module plugged in. First time it happened, I had it towed to the dealer. They diagnosed it as a bad starter and replaced it. The next time it happened about 2 months later, while trying to figure it out, I just happened to pull the Range module and it started right up. I contacted Range and they said they would exchange it for no cost to an updated version. With the newer module, I haven't had any problems since.

[GMCustomerService]

On 3/9/2025 at 11:01 AM, Mary Beth said:

We are having the same problem what ended up working for you?

Our team is here to help, Mary Beth. We would like to get you into the dealership and have an advisor take a look. When you are able, please email us at [email protected] with your VIN, we will keep an eye out. By sending us a message, you consent to the information you provide being monitored and recorded by GM or those acting on GM’s behalf, subject to the GM Privacy Statement: https://www.gm.com/privacy-statement.

[Mary Beth]

On 3/9/2025 at 1:57 PM, mikeyk101 said:

Any chance you are using a Range AFM Disabler plugged in to the OBDII port? I ask because I had a no start issue twice last year. I had an older Range module plugged in. First time it happened, I had it towed to the dealer. They diagnosed it as a bad starter and replaced it. The next time it happened about 2 months later, while trying to figure it out, I just happened to pull the Range module and it started right up. I contacted Range and they said they would exchange it for no cost to an updated version. With the newer module, I haven't had any problems since.

It ended up being the starter wire itself. It was connected but had pulled out just enough to cause the issue.

[mikeyk101]

3 hours ago, Mary Beth said:

It ended up being the starter wire itself. It was connected but had pulled out just enough to cause the issue.

Glad you got it figured out and thanks for the update. It may help someone else in the future.