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
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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The first character identifies identifies the system related to the
trouble
code:
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.
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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The IPC detects a loss of serial data communications from the BCM.
Fuel Gage
When the fuel level is less than 14 percent, the low fuel indicator illuminates.
The instrument panel cluster (IPC) displays the fuel level as determined by the powertrain control module (PCM) or the engine control module (ECM). The IPC receives a serial data message from the body control module (BCM) indicating the fuel level. The fuel gage defaults to E (empty) if:
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The PCM/ECM detects a malfunction in the fuel level sensor circuit.
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The IPC detects a loss of serial data communications from the BCM.
Odometer
The instrument panel cluster (IPC) contains a season odometer and a trip odometer. Momentarily press the trip/reset switch in order to toggle between the season odometer and the trip odometer. Press the trip/reset switch for greater than 2 seconds, while the trip odometer is displayed, in order to reset the trip odometer. The odometer is calculated and stored electronically in the body control module (BCM). The BCM uses the vehicle speed information from the powertrain control module (PCM) to calculate the odometer. The odometer displays 'error' if an internal IPC memory failure is detected. The IPC stores a backup copy of the odometer value incase the IPC stops receiving a valid odometer value from the BCM.
Speedometer
The instrument panel cluster (IPC) displays the vehicle speed based on the information from the ECM/PCM. The IPC receives the vehicle speed information from the BCM via the serial data circuit. The speedometer defaults to 0 kmh (0 mph) when the following occurs:
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The powertrain control module (PCM) or the engine control module (ECM) detects a malfunction in the vehicle speed sensor circuit.
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The IPC detects a loss of serial data communication from the BCM.
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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
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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