TC Calibrations LTD
HPTuners 17-23 TCM Tunes
HPTuners 17-23 TCM Tunes
17-19 L5P Duramax TCM Efilive Tunes
0/17
Vehicle VIN (17 characters)
Only A–H, J–N, P, R–Z and 0–9. Exactly 17 characters.
VIN must be exactly 17 characters (no I, O, Q).
EFILive details required
18 characters, letters/numbers only. We’ll auto-format.
Auth code must be XXXXXX-XXXXXX-XXXXXX.
Exactly 12 digits. If it doesn’t start with 0 we’ll left-pad when short.
Serial must have data input.
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