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Ford Focus 1.6 LX Auto 2005 code U0001 error - was fixed by diagnostics - now doing it again?

I had problem with my Ford Focus 1.6 LX Auto 2005 stating problem with transmission and speed reduced or not starting! Breakdown came out as engine light then stayed on, the code U0001 come up on my car which is high speed can communication bus. This was taken away and run through diagnostics which cleared this, was then taken out for a 10 mile run auto and manual gears selection with no problem. This then had fault codes and live running data rechecked, which showed no other faults. It has run fine for about 3 days and now started again!? What do you think it could be or how I could fix it, as don't have money for new bus?

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  • Cars & Trucks Master
  • 1,209 Answers

This code is a communication error code. Modern cars have many computer modules that must talk to each other. when there is a problem with one sending or receiving data the main computer recognizes this and goes into what is known as "limp mode" as to not leave you stranded.
Have you had any work done, or made any modifications to the car lately? It could be something as simple as a grounded out pin at the ALDL connector where you plug the scan too in, it could be a bad wire in one of the wire harnesses, or a bad connection at one of the main connectors where the harness attach to the module. I know this is a vague answer, but hopefully it gives you a place to start.

Posted on Apr 21, 2013

  • Sarah Apr 21, 2013

    No I have had nothing done to it, will have to take it to Ford and I'll let them know what you have stated also, thanks

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  • Master
  • 563 Answers

I would guess a wiring issue. Did it by chance rain when the issue occurred again?

Posted on Apr 21, 2013

  • 1 more comment 
  • Sarah Apr 21, 2013

    I think it had rained if I remember correctly but not completely sure

  • Chris Weiser
    Chris Weiser Apr 27, 2013

    I would clear the fault and see what happens. Pay very close attention to circumstances at the time of the failure. Water is a distructive force, and rusted wires can play some weird tricks.

  • Chris Weiser
    Chris Weiser Apr 27, 2013

    Also pay attention to road surfaces, ie bumpy road prior to failure.

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Hello engelhard58
I have attached a link that can give you some of the reasons why your getting that code.I hope you able to get your answer out of that.
Mean of the code=P0420 Catalyst System Efficiency Below Threshold.
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Change the ATF, AT filter and pan gasket. http://forums.mercedesclub.org.uk/showthread.php?t=45725

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SOURCE: Ford Focus Engine System Fault warning light

yes there is a know problem with the fuel system. fuel pump breaks down, empty your fuel filter into a bowl and check for metalic, if you have this in the filter your pump is F..... along with all the other common rail stuff. expensive job... error codes though, i find that hard to believe, fuel pressure faults will occur, i think you garage does not know what to do. or does not want to tell you the cost of the job and he will be in doubt himself of wether he is right..... was you engine coil light flashing at any point.!!!

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SOURCE: Code U1001 Communication circut fault

u1001 trouble code what is the meaning of this

Posted on Jul 01, 2010

ZJLimited
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SOURCE: Went to advance auto parts

Both fault codes are refer at air intake system; check this information to solve it...

P0103 - Mass Air Flow (MAF) Circuit High Input
Basically this means that there is a problem with the Mass Air Flow High (MAF) sensor or circuit. A more technical description would be that the MAF circuit had higher than expected voltage (air flow). Other MAF sensor circuit DTC trouble codes are P0100, P0101, P0102, and P0104.

Symptoms: You will likely not notice any serious drivability problems, although there may be symptoms such as a general decrease in power or sluggishness.

Causes: A code P0103 may mean that one or more of the following has happened:
The MAF may be disconnected, or a wiring connection may be bad
The MAF sensor may be damaged
The vehicle computer may be faulty (very rare)

Possible Solutions: The simplest thing to do is to reset the code and see if it comes back. Then start with the cheapest, easiest repair procedures:
Verify that the Mass Air Flow Sensor wiring is connected properly and that there are no broken / frayed wires.
Inspect for any air leaks near the MAF sensor.
Take the MAF out and clean it using a spray cleaner such as brake cleaner or electrical contact cleaner. Be gentle with the sensor.
Check the voltage of the MAF sensor (refer to a repair manual for vehicle specific information)
Replace the MAF sensor.


P0113 - Intake Air Temperature Circuit High Input
The powertrain control module (PCM) monitors the temperature of the air entering the engine. The PCM supplies a 5 volt reference voltage to the Intake Air Temperature (IAT) sensor. The IAT is a thermistor that varies resistance based on temperature. As the temperature increases, resistance decreases. Low temperature results in a high signal voltage. When the PCM sees a signal voltage higher than 5 volts, it sets this P0113 check engine light code.

Potential Symptoms: There will likely be no symptoms other than illumination of the Malfunction Indicator Lamp (MIL - Check Engine Light / Service Engine Soon).

Causes: A code P0113 may mean that one or more of the following has happened:
Internally failed IAT sensor
Faulty connection at IAT sensor
Open in IAT ground circuit or signal circuit
Short to voltage in IAT signal circuit or reference circuit
IAT harness and/or wiring routed too close to high-voltage wiring (e.g. alternator, spark plug cables, etc.)
Faulty PCM (less likely but not impossible)

Possible Solutions: First, if you have access to a scan tool, is there an IAT reading? If the IAT reading is logical then the problem is likely intermittent. If the reading is less than -30 degrees, unplug the connector. Install a jumper wire between the harness connector signal and ground circuits. The IAT temperature reading on the scan tool should be maxed out at the high end. For example it should be 280 degrees Farenheit or higher. If it is, the wiring is okay, and it may have been the connection. If it isn't install the jumper wire between the IAT signal circuit and the chassis ground.

If now the IAT reading on the scan tool is maxed out then check for an open in the IAT ground circuit. If you get no reading at all on the scan tool, it's likely that the sensor signal is open or the 5 volt reference is missing. Check using a DVOM (digital volt ohm meter) for a 5 volt reference. If it's there, then unplug the connector at the PCM and check for continuity on the IAT signal circuit between the PCM connector and the IAT connector.

Other IAT sensor and circuit related DTCs: P0095, P0096, P0097, P0098, P0099, P0109, P0110, P0111, P0112, P0114


Check it, test it and keep us updated.

Posted on Apr 25, 2011

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