Question about 1998 Pontiac Sunfire

2 Answers

Car will attempt to srtat but will not stay running checkd cosed and came up with a U1016C loss of power to PCM

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  • jimebbers May 05, 2010

    Afternoon, the code U1016C comes up and the car will not run, it ran fine last I drove it a few days ago. I do not understand why there would be loose connections.
    Would there be any connection to some sort of security lock out, I noticed the radio does not lite up when starting as well.
    tks Jim

  • jimebbers May 05, 2010

    Afternoon, that is right there are no P codes at all.

    The battery was real low and I had to recharge it but that is all the issues i have had.

    Tks Jim

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2 Answers

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  • Pontiac Master
  • 76,846 Answers

This code actually means loss of communication to PCM not loss of power, this could be the PCM causing the problem due to an internal circuit problem, u don't have any "P" codes? here is a list of codes

go to the link
obd
-codes.php">http://www.obd-codes.com/trouble_codes/gm/gm-u-network-obd-codes.php

Posted on May 05, 2010

  • yadayada
    yadayada May 05, 2010

    this can also be caused by a defective BCM (body control module) due to the complex nature of this code I really suggest u have the dealer diagnose this before u spend any money on the very expensive modules. from the repair manual here are the code definition's, based on the symptom the BCM or PCM could be at fault, the BCM must be replaced by the dealer, it has to be programmed to your specific car...



    DTC U1016 Loss of Class 2 Communication with VCM
    DTC U1016 Loss of Communications with PCM

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  • Pontiac Master
  • 17,970 Answers

The first character identifies identifies the system related to the trouble code:

  • P = Powertrain
  • B = Body
  • C = Chassis
  • U = Undefined
U1016 - Loss of Communications with PCM (Powertrain Control Module)

C = Current
H = History

As for the VCM and PCM deal, your car has either one or the other, and I'm sure that you have PCM. Try clearing the codes and see if they come back. If they come back then you know for sure you have problems and it wasn't just a computer fart. The "HISTORY" just means that the problem came up in one of the last 50 start ups. If you drive the car and the problem persists then the code will come up as "CURRENT" untill you turn the car off for about a half an hour to an hour and then back on again, at which time it will be marked "HISTORY" again.

Check the wires, harnesses, clean and adjust lor lose connections, and finally, try to test with other PCM.

I'll suggest contact the dealer and have them check it out.

Posted on May 05, 2010

  • ZJ Limited
    ZJ Limited May 05, 2010

    If you cleared the codes from the console the history codes should go
    away. If a code keeps coming back but you have no
    TCC problem, then you have an intermittent problem, probably a loose
    connector. I would check and clean the connector for the transmission.

    The
    U1016 means that a network message was not answered at some time in the
    past 90 days or so. With 20 modules, more or less depending on the
    year, model and options, once in a long while two of them will talk at
    once and a message or two will be lost. The TTM is the Tilt and
    Telescopic steering wheel Module, and the lost messages apparently were
    between the Driver Information Module (DIM, the main computer for the
    car) and the TTM, and the PCM wasn't involved. If it doesn't come back
    after you clear the codes, forget it. Even if it does come back, but
    takes several days or more to reappear, forget it. If it comes back
    within a day more than once, look for a loose connector under the
    dashboard.

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1 Answer

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?€¢
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?€¢
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?€¢
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?€¢
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?€¢
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?€¢
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?€¢
The PCM/ECM detects a malfunction in the engine speed sensor circuit.


?€¢
The IPC detects a loss of serial data communication from the BCM.

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