P1631 Diagnostic Trouble Code Discussion for April 2004
Theft Deterrent - Start Enable Signal Not Correct
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| Help Request | Posted | |
| 1998 Chevrolet Express 1500 4.3L No Start, Stall VIN: 1GCFG15W3W P1631: Theft Deterrent - Start Enable Signal Not Correct. ... spark but inj. pulse disappears w/ code p1631 (pass lock system fault security)decided i better reflash vcm. still had same results, even after reprogramming vtd in ign switch (code p1631 &no start)i replaced ign switch and reprogrammed ign switch agai... |
April 13, 2004 |
