My car is not start it's only cranking

Tiny
FAYE123
  • MEMBER
  • 2008 FORD F-350
  • 40,500 MILES
My car is not starting up it's only cranking here is what happened


If I tap the key in the start position but don't hold it. The vehicle will continue to crank for so much time. But doesn't start at all.
I found an error code was P0703
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Monday, September 9th, 2013 AT 11:58 AM

13 Replies

Tiny
HMAC300
  • EXPERT
That codes I for a brake light switch problem and shouldn't effect starting. Is this a gas or diesel engine? It might still be covered under warranty if you have the exteneded warranty with it.
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Monday, September 9th, 2013 AT 12:13 PM
Tiny
HMAC300
  • EXPERT
I forgot check the fuel pressure first.
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Monday, September 9th, 2013 AT 12:14 PM
Tiny
FAYE123
  • MEMBER
It's diesel no its out of warranty, and I also got this error code U0155, U0100
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Monday, September 9th, 2013 AT 12:36 PM
Tiny
HMAC300
  • EXPERT
I was kind of afraid you were going to say diesel. I am not a diesel guy but have your battery/batteries checked for condition as well as load test. Auto parts do this for free. Then look at the fuses in the pic this box is underhood you can test them with a test light and they should light on both sides also check the pcm relay because the one code is that the ecm has lost communication so that may be your problem. Also try resetting your anti theft unit it should tell you how in manual as we don't have instructions for that only to fix them. Also with the u0155 code you may have lost the fuel prime so if youspray choke cleaner in air duct and it starts then it's a fuel problem. But for the other problem of a no start it needs a pro type scanner hooked to the it to test other areas.
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Monday, September 9th, 2013 AT 1:05 PM
Tiny
FAYE123
  • MEMBER
To be honest with you i'm in Africa ( Djibouti) they don't have a dealer there. But I have OTC Geysis scanner tool, and I also have Ease reprogramming.

1- for U0155 code I replaced the fuel prime and still didn't work
2- I have Ease tech get into my computer to reprogram the PCM and he said it reprogramed
3- canu send me the fuses pic cause I don't see anything
4- How do I reset the anti theft can you instruct how please
5- since you not a diesel guy do you anyone else can help or I can call please
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Monday, September 9th, 2013 AT 2:41 PM
Tiny
2CARPROS MIKE
  • ADMIN
Here are the code definitions
P0703 Torque Converter/Brake Switch B Circuit Malfunction
U0100 Lost Communication With ECM/PCM "A"
U0155 Lost Communication With Instrument Panel Cluster (IPC) Control Module

I will have another expert take a look at this problem for you.
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Monday, September 9th, 2013 AT 4:25 PM
Tiny
2CARPROS MIKE
  • ADMIN
It sounds like it could be a battery problem. Sometimes when batteries get low on charge or are failing, they don't have enough power to disengage the starting circuit. Have the batteries load tested.
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Monday, September 9th, 2013 AT 4:57 PM
Tiny
SATURNTECH9
  • EXPERT
What size engine do you have?Is the security light on solid or flashing with the key in the run position?Also what does the high pressure oil pressure read on the scan tool while cranking?Also have you checked for water in the fuel filter etc?Air in the fuel lines?How long ago did you replace the fuel filter?
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Monday, September 9th, 2013 AT 6:37 PM
Tiny
2CARPROS MIKE
  • ADMIN
The instrument cluster is the most intelligent computer on the vehicle, and if it doesn't work, nothing else will. It is what tells all the other computers to turn on. It has to be a compression or timing problem. Real slow cranking could be considered a compression problem if you want to get technical, but that would explain the no-start condition. If the ecm is not communicating with the engine the fuel will may not be delivered as it should and not start.
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Monday, September 9th, 2013 AT 6:41 PM
Tiny
RIVERMIKERAT
  • MEMBER
The 2 "Lost Communications" errors are probably where this problem lies.

1: Check and clean the connectors to the ECM and instrument cluster.

2: Check the grounds for these two items.

3: Check the wiring to the ECM and instrument cluster.

4: Listen carefully when you crank the engine?Can you hear the fuel pump engaging?

5: Find the fuel pressure test port inside the engine compartment. Crank the engine and then carefully push the valve in the port, shielding your eyes and mouth. If no fuel sprays, you have a pump problem or air in the lines.
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Tuesday, September 10th, 2013 AT 7:37 AM
Tiny
FAYE123
  • MEMBER
I have the video for you all so you can get the idea of what i'm talking about
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Tuesday, September 10th, 2013 AT 8:23 AM
Tiny
FAYE123
  • MEMBER
I have the video to see what i'm talking about but I can't send it here it doesn't go through. Is there any way I can send the video of the truck
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Tuesday, September 10th, 2013 AT 8:55 AM
Tiny
2CARPROS MIKE
  • ADMIN
If you upload the video to youtube you can post the link here
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Wednesday, September 11th, 2013 AT 1:39 PM

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