2003 chevy 2500 has 4l80e i have shift lock enabled but why is it 1 to 2 shifts it wont hold first gear unless im WOT but it will hold any other gear is there something im missing i forgot to change thanks
2003 chevy 2500 has 4l80e i have shift lock enabled but why is it 1 to 2 shifts it wont hold first gear unless im WOT but it will hold any other gear is there something im missing i forgot to change thanks
We need a tune and log file to look at, otherwise we're just guessing.
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Shift lock as to do with the TCC.
[ECM] 400 - TCC Lock During Shift: When enabled, the VCM will allow the TCC to remain locked during shifts in an automatic transmission fitted vehicle.
Look under D1 Urban. It shows to command 1-2 shift at 24mph at 50% and less.
Over 50% it shows to command 1-2 at 256mph.
You also have your WOT RPM Shifts at 6000rpms but your fuel rev limiter is 5700rpms
Last edited by RDF1; 01-06-2024 at 10:46 PM.
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