LOSS OF HIGH SPEED GMLAN COMMUNICATIONS, INTERMITTENT NO CRANK, IP GAGE
FLUCTUATION, INTERMITTENT DOOR LOCK CYCLING, INTERMITTENT CHIME OPERATION,
VARIOUS IP WARNING LAMPS ILLUMINATED, TRANSMISSION MAY NOT SHIFT, ENGINE MAY
STALL, COMMUNICATION DTCS U0073, U0100, U0101, U0102, U0109, U0121 OR U0140 SET
(REPAIR TERMINALS IN TRANSMISSION HARNESS CONNECTOR, REPAIR OPEN OR
SHORTED GM HIGH SPEED LAN CIRCUITS, OPEN OR SHORTED DATA LINK RESISTOR,
CORROSION OR POOR CONNECTIONS IN VARIOUS CONTROL MODULE CONNECTORS)
TECHNICAL SERVICE BULLETIN
Reference Number(s): 08-07-30-021H, Date of Issue: Jun 25, 2015
Affected
Model(s):
2007-2009 Cadillac XLR 2007-2014 Cadillac Escalade Models 2009-2013 Cadillac Escalade Hybrid
2007-2013 Chevrolet Avalanche, Silverado 1500 2007-2014 Chevrolet Corvette, Silverado 2500/3500,
Suburban, Tahoe 2008-2013 Chevrolet Silverado Hybrid, Tahoe Hybrid 2007-2013 GMC Sierra 1500
2007-2014 GMC Sierra 2500/3500, Yukon Models 2008-2013 GMC Sierra Hybrid, Yukon Hybrid
2008-2009 HUMMER H2 Equipped With Gasoline Engine and 6 Speed Automatic Transmission 6L80
(RPO MYC) or 6L90 (RPO MYD) Equipped With Hybrid Propulsion (RPO HP2) and Two Mode 2ML70
Automatic Transmission
Attention:
As of the 2015 calendar year, the Data Bus Diagnostic Tool is available to assist in diagnosing issues
with High Speed LAN. Refer to the Data Bus Diagnostic Tool User Guide, available in SI under Select
and View a User Guide on the base screen. If after using the Data Bus Diagnostic Tool, the cause of
the issue has not been found, continue with this bulletin which covers common areas of possible
concern. This Bulletin also applies to any of the above models that may be Export vehicles.
Supercedes:
This Bulletin has been revised to add Model Years and update the information. Please discard
Corporate Bulletin Number 08-07-30-021G.
CONDITION
Some customers may comment on any of the following conditions:
The malfunction indicator lamp (MIL) may be illuminated.
Instrument panel cluster (IPC) warning lamps may illuminate.
The transmission may not shift or defaults to 2nd gear.
The door locks may cycle by themselves.
The engine may not crank intermittently.
Engine may stall (applies to Corvette, Hybrid Full Size Truck models)
A driver information center (DIC) message may be displayed.
The IPC gages may fluctuate.
Applying the brakes may cause the IPC to become erratic and the chimes to operate simultaneously.
Engine cooling fan runs continuously causing dead 12v Battery.
Malfunction Indicator Lamp flickers or is dim.
Depending on the vehicle and build, technicians may find one or more, but not limited to the following, High Speed
GMLAN Communication DTCs set as Current or History:
P0700: Transmission Control Module (TCM) Requested MIL Illumination
U0073: Control Module Communications Bus OFF
U0100: Lost Communication With ECM/PCM
U0101: Lost Communication With Transmission Control Module (TCM)
U0102: Lost Communication with Transfer Case Control Module (TCCM)
YMMS: Jun 5, 2024
Engine: 5.3L Eng License:
VIN: Odometer:
2008 Chevrolet Tahoe Base
U0109: Lost Communication With Fuel Pump Control Module
U0121: Lost Communication With ABS Control Module
U0140: Lost Communication With Body Control Module (BCM)
U186B: Lost Communication With TCM
U0129 : Lost Communication with Brake System Control Module
U186B: Lost Communication with TCM
U0293: Lost Communication with HP2 Powertrain Control Module
U1862: Battery Energy Control Module Lost Communication with Communications Gateway Module
U1876: Drive Motor Control Module A Lost Communication With Engine Control Module (ECM)
U1879: Drive Motor Control Module B Lost Communication With Engine Control Module (ECM)
U1886: Battery Energy Control Module Lost Communication with Engine Control Module (ECM)
U1888: Hybrid Powertrain Control Module Lost Communication With Starter/Generator Control Module
CAUSE
These conditions may be caused by, but not limited to, any of the following:
Chafed, damaged, pinched, open or shorted wiring.
The terminal(s) for the High Speed GMLAN Serial Data Bus has or have backed out of the 16-way electrical
connector to the automatic transmission.
The terminal position assurance (TPA) lock in the transmission 16-way electrical connector is not fully seated.
The High Speed GMLAN Serial Data Bus circuits are open or shorted to ground.
Corrosion in a control module connector.
Intermittent or poor connections in the inline connectors containing the High Speed GMLAN Serial Data Bus
circuits.
Water intrusion in a control module connector.
Негізгі бет 2007-14 Tahoe, Lost Communication, U0100, U0101, U0102 Chevy trucks
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