Question about 1999 Ford F150 Regular Cab

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U1073 scp code

My engine over heated last week and I had the temp unit replaced. Now my temp gage goes to normal then up to max heat and after I put on the heater the temp goes back to normal. I am getting an error coade of U1073 SCP and need to know how to fix it.

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Hi MaddMD!

This is partly an answer to part of your question, and part clarification request

According to: the U1073 SCP is defined as:
"U1073 SCP (J1850) Invalid or Missing Data for Engine Coolant PCM REFER to Powertrain Control/Emissions Diagnosis (PC/ED) manual"

Okay.... I need to research what exactly the above means, but I also need a little more information from you.

  • What engine do you have?
  • Were there any malfunction indicator lights (MILs)?
  • How did the overheating occur (stopped at idle, going down the road, A/C on or off?), and how drastic was it? (i.e.: Was there loss of engine oil, any significant smoking or steam out of the engine bay, significant loss of power?)
  • Do you know what caused it to overheat? (Low coolant, fan failure, broken belt, water pump problem, stuck thermostat)
  • What prompted you to change the temp sensor?
  • Is it an electric or engine driven radiator fan?
The way you describe the situation now, without considering the code, it sounds like the radiator fan is not moving enough air across the radiator to remove heat from the coolant. Turning the heater on causes the heater core to act as a kind of substirute radiator and thus lowering the engine temp. This can be verified, if the truck is driveable, by going down some open road with the heater on to cool the engine, switching off the heater and then see if the temp comes back up while moving at least 30 mph or if it stays down. If it stays down while moving, try stopping and idling for a couple of minutes and see if the temp then goes hot... If so, the fan is not working as it should and should be looked at. Don't let it get too hot, and see if you can get it to an AutoZone to have them perform a free diagnostic scan and see what OBD-II trouble codes are set.

Get back to me by posting a comment to your problem with whatever further information you can gather and also by sending me an e-mail at so that I'll know to check that information, and in the meantime I'll check with some of my Ford tech friends as to the signicance of the U1073 SCP code.


Posted on Jun 19, 2008

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