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mechanic110
mechanic110, Auto Technician
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what does a DTC U1016 Loss of Class 2 Communication with VCM

Customer Question

what does a DTC U1016 Loss of Class 2 Communication with VCM code mean
Submitted: 4 years ago.
Category: GM
Expert:  mechanic110 replied 4 years ago.

mechanic110 :

Hello and welcome to Just Answer. My name is Steve and I will try my best to resolve your issue.
I found a service bulletin that may help you.

Intermittent Loss Of Communication Several U-Codes and Symptoms
[2006 Buick Rainier
2006 Chevrolet Trailblazer, Trailblazer EXT and Trailblazer SS
2006 GMC Envoy, Envoy XL and Envoy Denali
2006 Saab 97x
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern (http://service.gm.com/servlets/#ss1-1766589[/URL]
<a href=""http://service.gm.com/servlets/#ss1-1766589)

Intermittent Loss Of Communication with several U-Codes and possible symptoms. Most common codes are the U1300, U1301 and U1305, U1016, U1064, U1096, U1169, U1161and U1162. Symptoms are one or all of the following; ABS Light On, Security Light On, Multiple Indicators On in the IPC, Heated Seats inoperative, Drivers and/or Passengers Door Window(s), Lock(s) and Mirror(s) are Inoperative. This concern can be intermittent and at times difficult to diagnosis yet communication is not always lost with the Tech 2. This concern when present, can be cleared by cycling the ignition to the "OFF" position, pause for a moment, then restart the vehicle. This could be the result of a module software concern and only applies to vehicles equipped with Memory seats (AAB), Heated seats (KA1), Electric Pedals (JF4) or a combination of them<a href=""http://service.gm.com/servlets/#ss2-1766589
]

An updated calibration was released for this concern. This calibration only applies to vehicles equipped with Memory seats (AAB), Heated seats (KA1), Electric Pedals (JF4) or a combination of them. The software was released on Monday February 20th 2006 through "TIS-2-WEB". It will be necessary to reprogram the Drivers Door Module (DDM), Passenger Door Module (PDM) and Drivers Seat Module (DSM).
1st - Reprogram the Drivers Door Module (DDM). Use SPS programing procedures and select the calibration that states
New software to address intermittent loss of power mirror, power window, and heated seat functionality which may be temporarily corrected by cycling the ignition".
2nd - Reprogram the Passenger Door Module (PDM). Use SPS programing procedures and select the calibration that states
New software to address intermittent loss of power mirror, power window
3rd - Reprogram the Drivers Seat Module (DSM). Use SPS programing procedures and select the calibration that states...
"New software to address DSM no communication issue during factory testing
Note: Prior to programming the Drivers Seat Module, make sure the LGM/DSM fuse is installed. This will only be a concern if TIS had a message advising to remove LGM/DSM fuse for programming the Drivers or Passengers door module.
If there are programming concerns, the TIS version numbers are listed below. Verify your TIS version numbers as necessary
TIS 2000

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information

mechanic110 :

Basically the vehicle control module needs to be updated by a GM dealer or an independant shop that has the capabilities of doing this.
It appears to be a technical issue but not a recall.

Expert:  mechanic110 replied 4 years ago.
Hello again.
Just wondered if you still need help with your question.