can bypassing transponder ignition cause ECM to not show up on smog test in California?

Asked by Sep 07, 2017 at 10:51 PM about the Pontiac Montana

Question type: Maintenance & Repair

I recently bought a 2000 Chevrolet Venture at an auction. It came with a key
and It has an jerry rigged wire going from a push button on the dash, to what
I assume is the starter. I'm guessing they lost the original key.  When I went
to have it smogged in CA I was told that the car wouldn't even show up on
their ODB prior to running the smog.  To make a  short question even longer
I was wondering if that bypass ruined the ECM or causes it not to show when
getting smogged

2 Answers


Who knows if they are cutting wiring, they could cut some wiring from a ECM OBD2 circuits to use, to wire up the ignition starter bypass thing. So i assume that now you had to testing that , they can talk with its computer somehow. ECM can have some loose connector pins, for the OBD2 data . Of course the testing people could have bad connectors , in their test stuff also.


If the ECM was bad it wouldn't run at all, I would check all the fuses, even those in the power distribution box, it only takes one fuse to disable the OBD data stream but it will stil run.

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