Wrench Light when switching to 4x4

[Motorcity muscle]

Lot of miles on truck, have you checked the vacuum lines to the 4 x 4 control module.

 

[Simsy]

Lot of miles on truck, have you checked the vacuum lines to the 4 x 4 control module.

where is that located? just so i know general area

 

[rslynes]

how can I test the solenoid? would that cause hard shifts even when only in 2wd? I have no codes

Bad solenoid would cause vacuum leak causing the front wheel IWEs to remain engaged in 2WD. Checking would require vacuum gauges, etc. to do any real testing and probably more time than the actual part replacement. Again, use the OEM Motorcraft/Ford product for replacement, not an aftermarket.

No, it would not cause 'hard shifts', nor always trigger a 'check engine' error code depending on the severity of the leak if it has one. If you're higher mileage, just replace it as it is cheap insurance.