4x4 doesn't engage, P0171 and P0174 when switch to 4LO... IWE Solenoid? - Ford Truck Enthusiasts Forums



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4x4 doesn't engage, P0171 and P0174 when switch to 4LO... IWE Solenoid?

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Old 01-25-2017, 11:55 PM
nddragon01 nddragon01 is offline
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4x4 doesn't engage, P0171 and P0174 when switch to 4LO... IWE Solenoid?

Hi All,

An interesting problem I am having, but feel someone on here may have had the issue before.

Just recently replaced the driver side 4wd actuator. When testing the system to see if it was working, I noticed that in 2wd everything seemed to be in order (wheel spun without the half shaft, no grinding noises on test drive, seemed good to go).

However, when I switched to 4hi, the dash light "4HI" would come on but the wheel still spun freely without the half shaft. When the truck was off, the wheel and half shaft spun together as they should when vacuum is released from the actuator. When I switched to 4lo, the dash light did not come on and the check engine light came on. Pulling codes revealed P0171 and P0174.

Could these codes be caused by a bad solenoid? Is the solenoid not switching the vacuum off and that's my issue? Are there other possibilities?

Thanks all in advance!
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Old 02-07-2017, 02:31 PM
baitmaster baitmaster is offline
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Not knowing much about this, but did see that in my truck manual, there are fuse/relays for 4WD in the fuse block picture.
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Old 02-07-2017, 08:18 PM
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code 171 and 174 are manifold vacuum leaks........ since this happens when you try to engage 4 x 4, etc... seems to be related to the solenoids ... IWE would have vacuum as soon as the truck starts up... Solenoids should isolate the vacuum when you go to 4 x 4.
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