Can't seem to find any info on troubleshooting the communication error on my obd port. I tried my scanner as well as the guys at Napa. The port powers up but nothing to connect. Any help on how to start the attack on this would be greatly appreciated.
04 yukon denali OBD port has power and scanner powers up but wont connect
- Thread starter kingdom77
- Start date
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S33k3r
Full Access Member
We had this problem before on our 2500 Suburban; lines to the ECU were rusted. You are going to have to trace wires, unfortunately.
check the accessory fuse that powers the cigarette power port (usually the one closest to the driver), if the power port is not working then the fuse is burnt and that fuse also controls obd port communication. the obd port will always have power and ground regardless.
Dalt10
Member
- Joined
- May 23, 2019
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Same thing with my '02 Yukon. I saw that about the fuse on one of he Facebook pages. Changed the fuse and my OBD port works now. Never would have known.
ScottyBoy
Full Access Member
Watch some YouTube videos from "South Main Auto". He has dealt with this problem on numerous different vehicles. Unfortunately, it involves a lot of wire tracing and probing to figure it out. Most likely you have a corroded, broken or damaged wire somewhere. Some of the videos he found physical damage from hitting road debris, some were corroded from salty winter roads, and some had rodent damage/chewed wires. But if you watch his videos, you'll learn how to trouble shoot and repair this issue yourself. I hope you have a digital multimeter and a test light, because you'll need them.
S33k3r
Full Access Member
Dumb question, but how do you know the scanner is any good?
