85 Berlinetta - from 305 carb to '7427 - 700R4
67 Camaro - from 350 carb to '7427 - 4L60e
87 Corvette - MPFI - 700R4 - stock
95 GMC Sonoma - TBI (my $0D lab)
08 Pontiac G8 - stock
Ok, gotcha.
Are you checking for codes on the same key cycle that the error occurs, or after having cycled the key?
89 K1500 Scottsdale 5.7L 5spd 3:42 RamJet cam Dart iron TBI heads 427 PCM swap
95 C2500 Cheyenne 6.5L turbo diesel 4L80e 4:10 DB2-4911 Manual pump conversion 0411 PCM trans control 2Bar COS
05 Outback XT 2.5L turbo gas auto
Last edited by Marcus; 12-10-2021 at 11:23 PM.
85 Berlinetta - from 305 carb to '7427 - 700R4
67 Camaro - from 350 carb to '7427 - 4L60e
87 Corvette - MPFI - 700R4 - stock
95 GMC Sonoma - TBI (my $0D lab)
08 Pontiac G8 - stock
Update:
I think I found the problem. An intermittently defective TFP switch. When cold, switch D2 (N/C) is ok. I believe when hot it opens regardless of oil pressure on it. The PCM does not see an error as it seems to be a manual action by the driver. It's still not clear why the pressure stays at 100 pounds in that situation.
Anyway a new switch seems to have solved the problem. The truck is running very well and had no problem when hot.
On this test drive I couldn't feel any problem with the 3-2 solenoid. TECH2 indicates a fault when the solenoid is commanded OFF but this does not generate a PCM fault code.
I thank the friends who gave some feedback around here.
A happy Christmas with health and a prosperous new year!
Marcus
85 Berlinetta - from 305 carb to '7427 - 700R4
67 Camaro - from 350 carb to '7427 - 4L60e
87 Corvette - MPFI - 700R4 - stock
95 GMC Sonoma - TBI (my $0D lab)
08 Pontiac G8 - stock
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