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aka MacGyver
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165 Posts
Discussion Starter · #1 ·
I replaced my Instrument Cluster (IC) with an OEM IC from FORD. The speedometer was showing 100 MPH sitting still. I had FORD reprogram it but it did not work. After installing the new IC, I now have a TBC Fault that I did not have before. Anyone know what the fix is for this?
 

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aka MacGyver
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165 Posts
Discussion Starter · #2 ·
I have also replaced the 7 pin trailer plug and know it works correctly.
 

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aka MacGyver
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165 Posts
Discussion Starter · #3 ·
I have now removed, disassembled, and inspected the circuit boards and have found no faulty soldering (as per a couple of YouTube videos).
 

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aka MacGyver
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165 Posts
Discussion Starter · #4 ·
I ran a scan with my handheld scanner and it says I have a U1900 fault code which is a Controller Area Network Communication Bus fault.
 

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aka MacGyver
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165 Posts
Discussion Starter · #6 ·
check your fuses. make sure they are all there and continuity is good.
I have checked every fuse with a multimeter and everything is good. Rivertown Ford checked the TBC and it checks out good. Still scratching my head and cannot figure it out. Anyone?
 

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Are there codes? Speedo works now?
Hook up ForScan and look at the TBC controller
 

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aka MacGyver
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165 Posts
Discussion Starter · #8 ·
Just swing tested another TBC out of an 07 SRW 6.0 and still have the TBC fault.
 

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TBC fault can mean many things -- one of which is a shorted trailer plug or harness along the frame
can also mean the brake pressure switch -- center mounted on the brake master cyl
or the speed sensor (VSS)
 

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aka MacGyver
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165 Posts
Discussion Starter · #10 ·
Are there codes? Speedo works now?
Hook up ForScan and look at the TBC controller
I have a U1900 Controller Area Network Communication Bus Malfunction.

Speedo is fine,
 

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aka MacGyver
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165 Posts
Discussion Starter · #11 ·
Just replace the trailer plug triple check the wiring both of my trailers boat trailer and 18 foot flatbed trailer everything works fine
 

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Connecting a scanner with the ignition on can sometimes throw the U1900 code -- clear the codes, cycle the key, and see what pops up
it it re-occurs then disconnect the instrument cluster and scan again

This guy has a decent explanation of the U1900 code -- may want to look at it and see if anything jumps out

 

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The sensor is on the master cylinder, about mid way on the bottom
 

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aka MacGyver
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165 Posts
Discussion Starter · #15 ·
Connecting a scanner with the ignition on can sometimes throw the U1900 code -- clear the codes, cycle the key, and see what pops up
it it re-occurs then disconnect the instrument cluster and scan again

This guy has a decent explanation of the U1900 code -- may want to look at it and see if anything jumps out

Great read and very detailed, Thanks for that info and your assistance in helping me get this issue fixed. Ever since I have owned the truck (FEB 08) I remember the U1900 Code always popping up. I was told by the mechanic at the time that the U1900 “Always pops up on these trucks”.

Is there a “Pinpoint Test” in order to track down what could be causing this U1900 to pop up?
 

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aka MacGyver
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165 Posts
Discussion Starter · #17 ·
Sorry Sir. I have been trying different “Quick Fixes” that are not resolving the issue.

Currently, I have the instrument cluster pulled out. I had a friend of mine take it to Rivertown FORD to bench test it. Although I purchased it from Rivertown Ford parts department, you never know. Parts could be bad straight out of the box.

At this point, the IC (New) tested good, the original TBC tested Good, the 7 Pin trailer plug (New) works as it should. I am banging my head against the wall.
 
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