UI Bulletin #161b
http://www.gmupfitter.com
Bulletin #161b P a g e 1 Rev Date: February 8, 2021
Disclaimer: GM Upfitter Integration Technical 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 and/or modification of a vehicle. These 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
Intermittent Cluster, Radio and HVAC Display
Resets on Snow Plow Trucks
2020 – beyond Chevrolet Silverado 2500-3500 HD
2020 - beyond GMC Sierra 2500-3500 HD
With Snow Plow Prep Package (RPO VYU)
Condition/Concern:
Some trucks equipped with option VYU [Snow Plow Prep] and a snow plow,
may exhibit occurrences in which the Instrument Panel Cluster (IPC), Radio
and HVAC displays may “blank out” or reset after changing the snow plow
position. This condition is caused by a system voltage over-shoot
phenomenon called ‘load dump’. When the large electrical draw of the plow
pump motor is suddenly removed the field energ
y
that is built up in the
alternator causes a system voltage overshoot that momentarily moves above
the normal design operating levels for the module displays. As a result, the
displays will shut down or reset causing the momentary blank out condition.
The modules are designed to do this and immediately recover. No modules
should be replaced for this condition.
Repair/Recommendation:
Contact your local GM Dealer for an appointment to install P/N is 84731643 (HD
only) VYU Snow Plow Jumper harness per the latest version of GM Service
Bulletin PIT5387G. If your truck has RPO VYU and did not come with the harness
parts they may be ordered by your dealer.
Note: This jumper harness and installation will be provided [one time] without
charge. Installation charges will be waived only if the jumper is installed at your
GM dealer.