OBD2 reader won't read

Is your oil pressure at zero when you check gauges light comes on by chance?

FallenPB13 said:

I didn't know there was a manual method to retrieve codes

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Turn the key to the on/run position and then back off three times. Third time leave it in the on position. ON/OFF/ON/OFF/ON. If there are any codes they will read out where your odometer is displayed. If there are none it will say either done or 55. This wont work if you have a 98-00 tho.

FallenPB13 said:

Not that I noticed

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Check it out next time you have the problem. About a year ago, on a cold start my tj would start up fine but the oil pressure was at zero and the check gauges light came on. I would have to turn it off, restart and all would be well. Turned out to be my oil pressure sending unit. I believe a few others on here have had a similar problem

I have the same problem with mine. I have a 2000 so I guess the manual way wont work on mine.
I bought an El cheapo reader from walmart (I know...), but it works great every time in my two other vehicles. On the jeep, it takes 5-6 times til it may "connect" to the vehicle and then if/when it does connect, it "loses" signal before I can go through the menu. I have no codes present but it should still connect. I may take it to autozone just to see if their reader will connect before I buy a better scanner.

egclassic said:

I have the same problem with mine. I have a 2000 so I guess the manual way wont work on mine.
I bought an El cheapo reader from walmart (I know...), but it works great every time in my two other vehicles. On the jeep, it takes 5-6 times til it may "connect" to the vehicle and then if/when it does connect, it "loses" signal before I can go through the menu. I have no codes present but it should still connect. I may take it to autozone just to see if their reader will connect before I buy a better scanner.

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I think Some 2000 do work and some don't so it would be worth a try anyway.
Is your OBD port corroded?

Old thread I know but just came across it due to not getting a read from the OBD port in my 05.
There's a known issue with the OBD system on 05-06 Wranglers and it should be covered by warranty, see attached.