2005 Navigator AdvanceTrac Problems - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
Ford Expedition Forum | Lincoln Navigator Forum Forum for discussion of the Ford Expedition and Lincoln Navigator.

LinkBack Thread Tools Display Modes
post #1 of 2 (permalink) Old 06-30-09, 04:13 PM Thread Starter
Registered User
Join Date: Jun 2009
Posts: 1
2005 Navigator AdvanceTrac Problems

I have a 2005 Navigator with 68,000 miles. The 4X4 Low and 4X4 High lights flash for no apparent reason at no particular time. Typically (although not always), these are followed by the Check AdvanceTrac Light. When this happens, the speedo goes dead, I have no acceleration and I must pull to the side of the road, turn off the car and restart. Everything then seems fine until the problem recurs. This is sometimes in 10 minutes or in 3 weeks. The codes when the light is on are U1900IC and U2023 VDM. This problem has stumped 2 dealers and one independent shop. Everyone seems to think there is an intermittent short, but no one knows where. This problem first cropped up in October of 2008. For what it's worth, the battery voltage and CCA are fine. One dealer looked for chafed wires at the AC lines, but they were fine too.

Any input would be greatly appreciated. Many thanks.

fitnessking is offline  
Sponsored Links
post #2 of 2 (permalink) Old 07-01-09, 07:31 PM
360ci's Avatar
Join Date: Nov 2007
Location: Waterloo
Posts: 2,481
Re: 2005 Navigator AdvanceTrac Problems

I hate to say it, but if I remember correctly, code U2023 generally means a PCM problem. As electrical gremlins are hard to fault, when a bad one does occur, and reoccurs at any time without any said provocation then you can almost say a bad PCM. Not sure if you've had it tested or not, but I'd make sure the wiring harness is on tight (one Ford dealer here can't install fuses correctly!). If the wiring is in fact all good, then a new PCM might be your best, if not only option. The bad part is that installing a new PCM is best left to the dealer, as they have the proper equipment to legally transfer over the engine and VIN info.

'11 Ram Quad Cab 4x4 SXT 5.7L HEMI (stock); 48,500m
'06 Pontiac G6 GT 3.5L 220hp; 64,000m
'12 Chrysler 200 Limited 3.6L 283hp; 28,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!
360ci is offline  
Sponsored Links

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > Ford Trucks | Utes | Vans |SUVs | Crossovers > Ford Expedition Forum | Lincoln Navigator Forum

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome