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Vats delete with Hp Tuners

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Old Jul 19, 2025 | 06:39 PM
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Default Vats delete with Hp Tuners

I am getting a b2723 and b2721 code on my scanner and i deleted vats with HP tuners but my car will still not crank
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Old Jul 19, 2025 | 11:12 PM
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I might be wrong, but my understanding was that if the VATS system interferes, it cuts fuel, not crank?

There are a bunch of reasons why the car might not be cranking, what have you done to diagnose that it was the VATS/Security system and not something else?
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Old Jul 23, 2025 | 09:10 AM
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Moved to C5 Tech.
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Old Jul 23, 2025 | 09:54 AM
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Originally Posted by CheapC5
I am getting a b2723 and b2721 code on my scanner and i deleted vats with HP tuners but my car will still not crank
That code is telling you the BCM is not reading the key resistance value. To my understanding, you cannot tune that out.
Possible issues:
-Contaminated/faulty key pellet
-Bad lock cylinder
-Bad BCM
-Bad associated wiring
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Old Jul 23, 2025 | 10:13 AM
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Originally Posted by lucky131969
That code is telling you the BCM is not reading the key resistance value. To my understanding, you cannot tune that out.
Possible issues:
-Contaminated/faulty key pellet
-Bad lock cylinder
-Bad BCM
-Bad associated wiring
When they BCM doesn't read the key resistance properly, the message "pull key for 10 sec" comes up on the display. The car will start, but fuel cut will occur at speeds above ~5mph iirc. However, you can disable the fuel cut with HPtuners so you can drive the car around, but the message saying pull key for 10sec will always be present if the key resistance does not match the expected range - even with the HPtuners change. This issue has no effect on starting the engine... only driving above ~5mph.

CheapC5: just to clarify does no crank to you mean (people often misuse these words, so I want to clarify):
1) the engine does not rotate? AKA the starter is not turning the engine over or
2) the starter is working and the engine is turning over, but you are not getting combustion and the engine is not turning on?

Last edited by Monty23; Jul 23, 2025 at 10:21 AM.
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Old Jul 23, 2025 | 10:34 AM
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Originally Posted by Monty23
When they BCM doesn't read the key resistance properly, the message "pull key for 10 sec" comes up on the display. The car will start, but fuel cut will occur at speeds above ~5mph iirc. However, you can disable the fuel cut with HPtuners so you can drive the car around, but the message saying pull key for 10sec will always be present if the key resistance does not match the expected range - even with the HPtuners change. This issue has no effect on starting the engine... only driving above ~5mph.
While I'm not an HP tuners expert, I understand how the system works. .....and NO.....the engine NOT crank if the key resistance is not read by the BCM......otherwise any key would start the engine.
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Old Jul 23, 2025 | 11:00 AM
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Ok, I'm just going by experience, so I could be wrong. For my car, when I would start my engine and then get the message pull key (intermittent - 1 out of maybe 50 starts), It would idle as long as I want it to, but if I tried to drive the fuel cut happens? After I purchased HPtuners and turned the fuel cut off - the pull key message will still appear, but I can drive the car like normal.

No issues with starting, just driving before the HPtuners change. What am I misunderstanding?
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Old Jul 23, 2025 | 11:02 AM
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lucky 131969

Last edited by mmartinez; Jul 23, 2025 at 11:40 AM.
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Old Jul 23, 2025 | 11:29 AM
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Originally Posted by Monty23
Ok, I'm just going by experience, so I could be wrong. For my car, when I would start my engine and then get the message pull key (intermittent - 1 out of maybe 50 starts), It would idle as long as I want it to, but if I tried to drive the fuel cut happens? After I purchased HPtuners and turned the fuel cut off - the pull key message will still appear, but I can drive the car like normal.

No issues with starting, just driving before the HPtuners change. What am I misunderstanding?
You are conflating Column Lock issues with Pass-Key(VATS) issues.
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Old Jul 23, 2025 | 11:50 AM
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Do you have an LMC5 installed in your car? If you do did you do the Brown wire mod?
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Old Jul 23, 2025 | 12:01 PM
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Originally Posted by Smoken1
Do you have an LMC5 installed in your car? If you do did you do the Brown wire mod?
The OP does not have a stated column lock issue. He does have DTC for reading the key.
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Old Jul 23, 2025 | 12:38 PM
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...

Last edited by Smoken1; Jul 23, 2025 at 01:26 PM.
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Old Jul 23, 2025 | 12:42 PM
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I'm out...
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Old Jul 24, 2025 | 01:30 PM
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Originally Posted by lucky131969
You are conflating Column Lock issues with Pass-Key(VATS) issues.
Thanks for clarifying.
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Old Jul 24, 2025 | 04:44 PM
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Can you just turn off all the stuff in the BCM with a TechII clone?
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