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[Rob1642]

started the Jeep the other day to be greeted by a check engine light and aggressive gear changes.  Ran the fault codes and came up with P0523 and P0700.

as far as the 0523, am happy with fitting a new sensor as the wiring is fine.

with the 0700, I can't work out what gearbox I have fitted.  Automatic, that's obvious, but I can't get under the vehicle to check above the filter.

Can anyone give mee a steer in the right direction, and do I need to go direct to Jeep for the parts or are there suitable aftermarket ones?

Cheers

[Mike Pavelin]

If you have a 4.0, it's a 42RE. If you have a 4.7, it's a 45RFE.

[Rob1642]

Cheers Mike, should have stated that it's a 4.7

[Mike Pavelin]

You're barking up the wrong tree anyway. P0523 is an engine oil pressure sensor fault. P0700 alerts you that there is also a fault logged on the transmission control module, but you need a DRBIII scantool or something else that will do Chrysler transmission diagnostics to get into it further.

[Rob1642]

I'm happy that 0523 is the oil pressure sensor, that was the easy part to find out.  From what I can gather off http://www.wjjeeps.com/faultcodes.htm it could possibly be the output speed sensor.  Apparently the input sensor was changed a couple of weeks before I bought the car, so I am going to pull both of them and do a resistance check.