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No power to OBD - 2002 Chevrolet Tahoe

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Check fuses if needed pin wires for ohm reading

Posted on Nov 28, 2012


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My OBD will not power up on a 2005 pontiac montana.

SP205 is a splice pack , taped to the wiring harness behide the dash near the OBD connector .

My OBD will not power up ? Code reader , scan tool ????? .Pin #16 at the OBD connector should have B+ voltage .This is what supply's B+ voltage to the scan tool / code reader . What makes you think you need a computer ? The computer doesn't supply B+ voltage to that OBD port ,.Do you know where the i/p fuse box is ? You want the CIGAR/DLC /APO FRT fuse 20amp . The other wires you mention above , don't mess with those . Those are the class 2 data bus wires .Screw with those and short one out , you will never get your vehicle started . Suggets you google GM class 2 serial data bus communications .

Jan 25, 2017 | 2005 Pontiac Montana SV6

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I can not get power to the obd port for my 1997 mitssubishi gallant. what do I check?

The OBD port runs off the lighter fuse.Get that fixed and you will probably have power to the port. The black fuses are diodes. One for the PCM, the other for the A/C.

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03gmc envoy showing code p1514 and reduced power light on engine shuts down

Type: OBD & your codes

OBD PO 440

Codes have nothing to do with installing parts

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Codes are used to diagnose a system & component
test to find a problem

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Obd ii connector

You need to have the key in the run position with the engine off. The reader draws its power from the vehicle and therefore the electrical system needs to be energized. There should be instructions with the reader explaining this.

Oct 02, 2013 | 1995 Honda Accord

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No power seems like mis-fire.

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Feb 27, 2012 | 2008 Pontiac G6 Sedan

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Check your cigarette lighter fuse to see if its blown and replace it.Most obd connectors get power from the lighter circuit.

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OBD unable to access Diagnostic code

check the fuses for the obd system it could have blown making it unable to read because theres no power to the plug. if the fuses are ok using an ohm meter probe the plug with the ignition on is there power to one of the pins? if not there may be a break in the wire for the power part required for the obd to power up and read. hope this helps

Jan 29, 2011 | Ford Focus Cars & Trucks

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2000 explorer 4x4 4.0L SOHC - I have no power to

check fuse number 5 in the passenger compartment fuse box, it is a 10 amp, that is the OBD connector power supply, if that fuse is good just run power to pin number 16 of the connector, this the bottom row of pins last one on the right.

Mar 02, 2010 | 2000 Ford Explorer

1 Answer

Failed emissions What fuse for OBD port on 2006 Ford Fusion?

check the out put from the computer to the obd ll port if good need to check the wiring harness ,connections and pin contacts from computer to obd ll port connections possible short,frayed or broken wire

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