For 1990-2009 cars

DTC | Diagnostic Procedure | Module(s)
--- | --- | ---
Important: Unless otherwise directed by the Diagnostic System Check diagnose all Theft Deterrent Control Module (VTD) DTC's prior to diagnosing any Pxxxx codes.
11 | DTC 011 | VTD
12 | DTC 012 | VTD
13 | DTC 013 | VTD
14 | DTC 014 | VTD
15 | DTC 015 | VTD
16 | DTC 016 | VTD
17 | DTC 017 | VTD
18 | DTC 018 | VTD
55 | DTC 055 | VTD
P1501 | DTC P1501 | ECM
P1502 | DTC P1502 | ECM
P1503 | DTC P1503 | ECM
Pxxxx | Pxxxx other ECM DTCs Refer to Diagnostic System Check - Engine Controls in Engine Controls - 3.0L (L81) | ECM