I've read certain vehicles may begin flashing their check engine light if one bridges the diagnostic plug correctly with some wire before starting the vehicle. How does one do this for a Pontiac G6? I've attached a diagram.

obd2 plug

  • Why do you want to do this? – HandyHowie Nov 3 '15 at 20:43
  • I'm assuming you're trying to read error codes without a scan tool. You might want to clarify the question and the title. – JPhi1618 Nov 3 '15 at 20:56

As this article points out, the ability to blink codes was available with older OBD-I vehicles. Once the OBD-II standard hit, the ability to "blink" out codes was lost. This changeover to ODB-II happened in 1996 for vehicles sold in the US.

I know the same is true for Volkswagen cars. Early models had the ability to blink out the codes when something was jumped, but modern cars needed a special reader.

This bit is conjecture on my part, but I think the reason is that OBD-II is much more complex so the simple blinking was just abandoned.

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  • 1
    You are right for the most part, but I understand (haven't seen personally) there are some cars with OBD-II which you can blink the codes from ... GM is not one of them ... neither is Ford/Chrysler ... nor any other brand you'd normally find in the US for that matter. – Pᴀᴜʟsᴛᴇʀ2 Nov 3 '15 at 23:19

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