My fixd scanner only says low voltage. How can I increase the volts at OBD connection my check engine light is on trying to get code.
1999 GMC Sierra 2500 with a 5.3 litre Vortec engine
Scanner works on my other vehicle.
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Check for corrosion or discolored pins on the tester and receptacle. Your tester could have bad connection internally causing it to “see” a low voltage from your vehicle. If you have a multimeter check for the correct voltage at the test receptacle. If that’s not where it should be, I would trace the wiring looking for a resistance (ie, corrosion or loose connection) that shouldn’t be there. You may have pinched a wire when you installed the new engine. I hope this helps, Good luck!
I have 35 years experience doing electrical and avionics work on military jet aircraft to base my thoughts on.