Check Engine Light - U1900 & P0174 -

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Check Engine Light - U1900 & P0174

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Old 04-17-2012, 10:27 PM   #1
Join Date: Feb 2012
Vehicle: 2005, Ford, Mustang
Location: VA
Posts: 10
Default Check Engine Light - U1900 & P0174

My car has the check engine light on and I've used the OBD diagnostic tool and these are the two codes I get:
  1. U1900
  2. P0174

I have tried Googling, only to be left a bit more confused. So I thought I would post here and see if you guys can help.

I've had the car in the shop a few times already and I am not really looking forward to it going back again. After having the car back the first time, the check engine light came on and disappeared the next day so I thought it was a l good (it went on it's own.) Now it's back and giving a different code (the second code, the U1900 code came before as well.)
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sainraja is offline   Reply With Quote
Old 04-18-2012, 03:26 AM   #2
2nd Gear Member
Join Date: Apr 2011
Vehicle: 2005 ford mustang
Location: Texas
Posts: 242 Lighthope90

The u1900 code refers to a short in one of your modules. Example your pcm ( power control module) so in you need to get a manual and start checking all the modules. Electrical gremlins can be a real pita. The p0174 code refers to system running lean in bank 2. Maybe they coincide with each other which could be a good place to start. Find the module that controls air fuel ratio.
Rshustler1 is offline   Reply With Quote
Old 04-18-2012, 08:19 AM   #3
Join Date: Feb 2012
Vehicle: 2005, Ford, Mustang
Location: VA
Posts: 10


I need to get a hold of the manual then.....the workshop that repaired my car still has it. I have to go get that first and hopefully figure this thing out.
sainraja is offline   Reply With Quote
Old 04-18-2012, 11:22 AM   #4
4th Gear Member
Join Date: Jun 2006
Posts: 1,227

I would check to make sure the car does not have the dreaded passenger side water leak trashing the smart junction box.
GrayPony is offline   Reply With Quote
Old 04-18-2012, 11:22 AM
Ford Mustang

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05, 2005, 2013, cel, check, code, engine, ford, gt, light, mustang, p0174, service, u1900, v6

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