VATS issue - need help

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Mar 27, 2025 | 11:05 PM

#41

PugaZ06

Heel & Toe

Joined: Mar 2025

Posts: 22

Likes: 4

New TDR relay installed, so far so good.
Thanks again mmartinez.

Mar 28, 2025 | 04:52 AM

#42

jdmvette

Night Owl for life

Joined: Nov 2003

Posts: 24,725

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From: Bugs Bunny should'a made a left turn here

^ that's awesome, @mmartinez is very knowledgeable when it comes to figuring stuff like this out

Mar 28, 2025 | 09:49 AM

#43

mmartinez

Melting Slicks

Joined: Sep 2008

Posts: 3,138

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From: Espanola New Mexico

Your Welcome, always willing to help a fellow C5 corvette owner.

Mar 28, 2025 | 02:23 PM

#44

Monty23

Advanced

Joined: Mar 2025

Posts: 51

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From: Philly Suburbs, PA

Quote:

Originally Posted by mmartinez

It's VATS, which is built into the BCM, consists of the resistor key pellet reader in the Ignition switch which enables the BCM to provide a ground to the TDR. Don't know much about HP tunners but turning VATS off is disabling the input from the BCM to the PCM to allow fuel delivery.

Correct, you still get the error on the dash even with VATS turned off using HP tuners. HP Tuners VATS off setting simply has the ECU ignore the security warning and never shuts the fuel supply off at 2mph or so. If you don't want the error message too, you have to defeat the error via the resistor mod or LMC5 install - OR replace the actual defective component(s).

Mar 28, 2025 | 02:59 PM

#45

CJL64

Instructor

Joined: May 2024

Posts: 155

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From: New Jersey, USA

mmartinez said ....Never heard about a VATS bypass module? Most people simply soulder some resistors at the BCM connector after cutting the two wires from the Ignition switch. Simply measure your car keys resistor pellet and purchase two resistors to match the resistance value of the key pellet.

Genius. I read these posts to learn and hopefully remember if I have a problem.

Last edited by CJL64; Mar 28, 2025 at 03:09 PM.

Mar 28, 2025 | 03:03 PM

#46

lucky131969

Tech Contributor

Joined: Jan 2007

Posts: 19,452

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From: Dyer, IN

Quote:

Originally Posted by CJL64

Never heard about a VATS bypass module? Most people simply soulder some resistors at the BCM connector after cutting the two wires from the Ignition switch. Simply measure your car keys resistor pellet and purchase two resistors to match the resistance value of the key pellet.

Genius. I read these posts to learn and hopefully remember if I have a problem.

Why two resistors?

Mar 28, 2025 | 03:11 PM

#47

CJL64

Instructor

Joined: May 2024

Posts: 155

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From: New Jersey, USA

Quote:

Originally Posted by lucky131969

Why two resistors?

Not sure about two resistors .. that was a quote. I just like the idea of putting a resistor on the ign switch and not having to worry about matching key blanks. Maybe standard resistor values require two to get it in the finite range needed.

Mar 28, 2025 | 06:01 PM

#48

mmartinez

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Joined: Sep 2008

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From: Espanola New Mexico

I said two resistors because resistors are sold by certain resistance values and I don't know if you can buy just one resistor that is the correct value and you have to series two resistors to arrive at the correct value. Oh and I saw a pic of the mod on the BCM connector and it was two resistors.