Crank No Start, No Spark, Ucodes

WILL REY

MEMBER
2005 FORD F-150
4.6L
V8
2WD
AUTOMATIC
140,000 MILES

Well I did a scan now that I got a hold of OBD II Scanner and Looks like I have some U codes.

U1950
U1900

Before my truck was not starting up, it was stalling at stops and idle. It would restart just fine then die later at the next stop.

I Cleaned the Throttle Body, MAF, EGR Valve, but nothing stopped the stalling. So I changed the Cam Position Sensor. It did not help the stalling either.

Finally I tried turning it on again, and Its a "Crank No Start" Issue Now.

Checked the Coil Plugs its receiving power, But there is no spark when you turn the key? I am guessing no signal is being sent to fire off the spark plugs, also the cam position sensor wires have no power when I put the test light on it.

What could be my issue here any one with ideas or experience on this?

3 Replies

MHPAUTOS

MECHANIC
31,937 POSTS

These are communication error codes for the CAN Bus and UPB Bus often they can be set when system voltages drop below at set threshold, they should clear and not reset, check battery condition and alternator charge rate as well.

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Monday, May 31st, 2021 AT 12:39 PM

WILL REY

MEMBER
31 POSTS

Hey sorry for the late reply, You were right I believe it had to do with fire cause.

I decided this morning to look under the truck near the air conditioner compressor is the crankshaft sensor, and the wire plug connector and sensor were so greased up with mud dirt oil etc.

It was not making good connection to the crankshaft sensor. So I cleaned it up a bit, tried to push it back into the socket and that was it the truck started. I appreciate the time I actually watched the video on the "Crank no start" on this site and it helped out also.

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Monday, May 31st, 2021 AT 12:39 PM