Removed aftermarket remote start now wont start?

160,000 MILES • 6.0L • V8 • 4WD • AUTOMATIC
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JMARTIN666
  • MEMBER
  • 3 POSTS
I went and removed aftermarket remote start cuz I didnt have remote and now truck cranks and pops off but wont stay running and it ran before I removed the remote start. I've tried relearning the key n pass lock bypass n got nothing. So as far as I know everything is back to normal and everything works it just wont stay running after removal of remote start.
Mar 3, 2026 at 3:05 PM

What to check next

Diagnostic guidance. Suggested checks and possible repairs are separate from the owner's reported results.

Have the removed system's splices and interrupted factory circuits traced with the correct wiring diagrams. Record engine and security-system faults with suitable equipment. Restore the documented factory wiring before considering programming or replacement parts.

Guidance references and applicability

2CarPros: Original discussion 1712254 https://2carpros.com/questions/removed-aftermarket-remote-start-now-wont-start Source for reported history and outcome. Contributor suggestions are not independently confirmed diagnoses. Attachments were not verified.

Read the replies · Discussion summary and reported outcome

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CANNON1349
  • ✓Experienced Mechanic
  • 861 POSTS
Hello, will the truck stay running if the gas pedal is kept depressed? Otherwise then yes you may be on the right track regarding the anti-theft fuel shut-off capability. I have also seen some retro-fitments leave harnesses unplugged that give reference to the engine harness side.

William
Mar 4, 2026 at 10:09 AM
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JMARTIN666
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  • 3 POSTS
No nomatter what it pops off then just dies right away. I just found a green wire coming threw firewall that when I use test light it makes my rpm tack move when key is in the on position but idk where to connect it to.
Mar 6, 2026 at 7:14 AM
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CANNON1349
  • ✓Experienced Mechanic
  • 861 POSTS
If you bought a new key for the truck, it will likely need to be programmed. Have you tried the stock programming solution for the truck?

Here is an example:

Key Chip Programming (Passlock):
Step 1: Insert the new key and attempt to start the engine; it will likely stall.
Step 2: Leave the key in the "ON" position (do not remove it) and observe the SECURITY light. It should stay on or flash.
Step 3: Wait 10 minutes until the security light goes off.
Step 4: Turn the ignition to "OFF" for 5-10 seconds.
Step 5: Repeat steps 1–4 two more times (total of 3 cycles/30 minutes).
Step 6: On the fourth attempt, the truck should start.

Key Fob Remote Programming:
If you are trying to program the keyless entry remote (fob), use this method:
Close all doors and insert the key.
Press and hold the UNLOCK button on the driver’s side door panel.
Turn the ignition ON, OFF, ON, OFF (do not crank the engine).
Release the UNLOCK button; the doors will lock and unlock.
Hold LOCK and UNLOCK on the fob simultaneously for 15-30 seconds until the doors cycle again.
Turn the ignition to ON to exit.

William
Mar 6, 2026 at 11:19 AM
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JMARTIN666
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  • 3 POSTS
There is no security light on when key is turned to the on position and its the original key. I've disconnected the battery for a day n hooked it back up n same s*** cranks n pops off n then dies right away.
Mar 7, 2026 at 2:10 AM
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CANNON1349
  • ✓Experienced Mechanic
  • 861 POSTS
Okay, do you have a scan tool? There is a chance the scan tool will pick up on an electrical code relating to the fuel system or computer.

William
Mar 7, 2026 at 11:25 PM

Discussion summary

Removed aftermarket remote start now wont start?

The truck began starting and immediately stalling after removal of an aftermarket remote-start system. The original key was still in use. The owner reported an unidentified wire and no security light, and no completed scan result followed.

Reported outcome: No successful repair was reported.

The disconnected wire was not identified. The contributor's generic key and remote programming instructions were not verified for this installation and are not repeated.

Read the original discussion

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