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Gen III Flex fuel Write-up

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Old 08-15-2017, 06:43 PM
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Originally Posted by FlorianGee
I managed to run my 2002 CETA with a 12216125 OS on the stock 411 PCM. But I'm having issues with the ABS light and fuel gauge. Would either of you guys running a 411 PCM with a 12216125 OS be willing to share your HPT file? I'd really appreciate it!

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My swap does not not run abs or fuel gauge and I'm also using a p59 3 bar setup.. I would check your system options in hptuners and you'll also probably need a segment swap for the fuel gauge or just reconfigure the fuel settings with the compare function to match your 02 f-body settings.
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Old 08-21-2017, 02:14 PM
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Alright, I swapped all segments from a 2002 Tahoe into my 12216125 OS. The ABS error is gone and my fuel gauge is working

My only remaining issue is the "Service Vehicle" light. It's always on. The system options between my stock 12212156 OS and the 12216125 OS are identical. Only the last column "Not Used" states 255 for each value in the stock OS and 1 for the flex fuel OS. When I try to change it to 255 a warning pops up, see attached screenshot.

Any advice?
Attached Thumbnails Gen III Flex fuel Write-up-12212156-system-options.jpg   Gen III Flex fuel Write-up-12216125-system-options.jpg  
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Old 08-21-2017, 02:28 PM
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Originally Posted by FlorianGee
Alright, I swapped all segments from a 2002 Tahoe into my 12216125 OS. The ABS error is gone and my fuel gauge is working

My only remaining issue is the "Service Vehicle" light. It's always on. The system options between my stock 12212156 OS and the 12216125 OS are identical. Only the last column "Not Used" states 255 for each value in the stock OS and 1 for the flex fuel OS. When I try to change it to 255 a warning pops up, see attached screenshot.

Any advice?
What happens if you first change it to say 1, save/exit/reopen, and then set it 255...?
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Old 08-21-2017, 02:29 PM
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Do get a DTC for the Service Vehicle indicator (which module is it from...?)...?
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Old 08-21-2017, 02:29 PM
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Leave the "not used" at "1". Should be fine.

Use the VCM scanner to look up the active DTCs and report back.
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Old 08-21-2017, 02:30 PM
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No active DTCs
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Old 08-21-2017, 03:14 PM
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Originally Posted by FlorianGee
No active DTCs
No chassis or other DTC's...?
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Old 08-21-2017, 03:15 PM
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Nada. I was surprised too.
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Old 08-21-2017, 04:57 PM
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Is your gas tank empty? Could be throwing a service vehicle light for that instead of a check guages or whatever. I had a 99 that threw a strange light when I was dangerously low on fuel.
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Old 08-21-2017, 05:27 PM
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Its almost full, only 13mls since the last gas stop.
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Old 08-21-2017, 06:39 PM
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Scan it with a scanner that can read abs and airbag codes
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Old 08-22-2017, 12:54 AM
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Like a tech2? Or are there other scanners that can read these codes?
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Old 08-22-2017, 02:53 AM
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And others (they mention ABS on the package).

I thought HPT would read DTC's from all modules...?
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Old 08-22-2017, 09:10 PM
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Originally Posted by joecar
And others (they mention ABS on the package).

I thought HPT would read DTC's from all modules...?
nope
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Old 08-28-2017, 02:06 PM
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Originally Posted by joecar
And others (they mention ABS on the package).

I thought HPT would read DTC's from all modules...?
I have noticed on some cars that the HPT will not read BCM codes, so you'll need one that can read errors from BCM.
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Old 08-28-2017, 02:08 PM
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Can I segment swap an 02 Tahoe P59 onto my 02 C5Z?
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Old 08-28-2017, 04:09 PM
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Originally Posted by maxgee
I have noticed on some cars that the HPT will not read BCM codes, so you'll need one that can read errors from BCM.
On F-car the BCM is not on the serial/vpw bus.
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Old 08-28-2017, 04:10 PM
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Originally Posted by maxgee
Can I segment swap an 02 Tahoe P59 onto my 02 C5Z?
No, those are two different PCM's.
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Old 08-28-2017, 07:44 PM
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Originally Posted by joecar
No, those are two different PCM's.
Ok thanks.
What about overwriting the O/S on the Vette with the Tahoe?
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Old 08-28-2017, 09:45 PM
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Originally Posted by maxgee
Ok thanks.
What about overwriting the O/S on the Vette with the Tahoe?
Those two OS's are not compatible with each other's PCM.
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