AUTO MODULELAB
GM VATS SPECIALTY

Camaro IROC-Z / Trans Am VATS Delete — Third-Gen F-Body Bench Service

1987-1992 third-gen F-body owners — VATS delete frees you from the wear-prone resistor system.

Camaro IROC-Z (1987-1990)Camaro Z28 (1991-1992)Firebird Trans Am (1987-1992)Firebird Formula
Confirm fitment first

Symptoms — does this match what you're seeing?

  • •IROC-Z / Trans Am cranks but won't start
  • •Security light on dashboard
  • •VATS rejects original key (worn pellet)
  • •Engine swap (LT1 / LS swap) — donor ECM still has VATS active
  • •Restoration project — need engine to start without the deteriorated VATS wiring

What causes this

  • •Resistor pellet wires inside the ignition lock fatigued (38+ year old cars)
  • •Aftermarket key cut without a matching resistor value
  • •Engine swap donor ECM has VATS active and original chassis doesn't have VATS wiring
  • •Restoration / barn-find with corroded VATS wiring

Third-generation F-body Camaros and Trans Ams are now 35-40 years old. Even cars stored carefully have VATS systems showing their age — the resistor wires inside the ignition lock cylinder are simply at end-of-life. Daily-driver F-bodies fail VATS more often; trailer queens fail less often but still fail eventually.

The community-standard fix has been VATS delete for two decades. The math is the same as on Corvettes: removing the check at the ECM level eliminates the wear-prone resistor circuit from the start path. The car starts on any key that fits the ignition.

Specific F-body scenarios we see often: - IROC-Z restoration projects where the harness was disturbed during restoration and VATS won't accept the original key any more - LT1 swap (1993-1997 LT1 into a 1987-1992 chassis) — the donor LT1 ECM has VATS active but the third-gen chassis doesn't have VATS wiring at all - LS swap (Vortec 5.3 / 6.0 / 6.2 into a third-gen) — donor LS ECM may have its own immobilizer (separate service), but base GM Vortec 5.7L 0411 PCM with VATS active is a common candidate for this delete

Ship us the ECM, we delete VATS, ship it back. $150 flat. If you're not sure whether your ECM is in the supported list, text us the part number off the case label.

Why AML for this fix

  • Bench-level ECM modification — wiring + VATS module become irrelevant
  • Common service for restomod + LT1/LS swap builds
  • $150 flat
  • 24-hour bench turnaround
  • Compatible with 1227727, 1227730, 1227749 ECMs

Service used

GM VATS (Vehicle Anti-Theft System) Delete — 1986-2005 Resistor-Key ECMs

$150 flat · 24-Hour Turnaround · return shipping included

Full service page

FAQ

How fast can AML fix this?
24-hour bench turnaround from receipt. Round-trip from anywhere in the US: typically 5-7 days door-to-door.
How much does it cost?
$150 flat-rate, return shipping included. No diagnostic fee, no surprise charges.
What do I need to ship?
The ECM (under hood passenger-side or driver-side kick panel on most chassis) · Printed order confirmation · ECM part number from the case label · Your name, return address, and phone number
Can you fix it if a previous attempt made it worse?
Yes — recovery from botched programming or failed coding attempts is a routine part of our bench process. Ship what you have plus a one-line description of what was attempted.
Do you offer a warranty?
6-month programming warranty on all bench work.

Other GM VATS scenarios

C4 Corvette VATS Bypass — Resistor Pellet Failed, Won't Start

Ready to send it in?

Pay online, get the shipping address by email, drop it at any USPS / UPS / FedEx counter.

(817) 586-9634