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Service bulletins for the 2007 GMC Yukon

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

1313 on file from NHTSA, as of 2026-10-19.

About U0121 on the 2007 GMC Yukon: what the code means, and the bulletins and recalls about the same components.

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Only bulletins with trouble code: U0121 are shown. Show all

Bulletins, newest first
08-07-30-021H2017-08-15. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This technical bulletin provides repair information to correct customer concerns of loss of high speed GMLAN communications, intermittent no crank, IP gauge fluctuation, intermittent door lock cycling /chime operation, various IP warning lamps illuminated, transmission may not shift, communication DTCs U0073, U0100, U0101, U0102, U0109, U0121 or U0140 set.
08-07-30-021G2012-04-28. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). GM: LOSS OF HIGH SPEED GMLAN COMMUNICATIONS, INTERMITTENT NO CRANK, IP GAGE FLUCTUATION, INTERMITTENT DOOR LOOK CYCLING, INTERMITTENT CHIME OPERATION, VARIOUS IP WARNING LAMPS ILLUMINATED, TRANSMISSION MAY NOT SHIFT, COMMUNICATION DTCS U0073, U0100, U0101, U0102 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). *JS
SB-08-07-30-0212008-08-28. Service bulletin. LATCHES/LOCKS/LINKAGES:DOORS:LATCH; ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; ENGINE AND ENGINE COOLING:ENGINE; POWER TRAIN:AUTOMATIC TRANSMISSION; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). LOSS OF HIGH SPEED GMLAN COMMUNICATIONS, INTERMITTENT NO CRANK, IPC GAUGE FLUCTUATION, INTERMITTENT DOOR LOCK CYCLING, TRANSMISSION MAY NOT SHIFT, DTCS U0073, U0100, U0101, U0102, U0121, U0140 SET (REPAIR BACKED OUT TERMINAL IN TRANSMISSION HARNESS CONNECTOR). VEHICLES WITH 6 SPEED 6L80 (RPO MYC), 6L90 (RPO MYD) OR HYBRID TWO MODE 2M70 AUTOMATIC. INCLUDING 2008 TAHOE AND YUKON HYBRID MODELS. *PE UPDATED 3/28/11. INCLUDING SIERRA, SILVERADO AND ESCALADE HYBRIDS. *PE
PIT-40562007-09-20. Service bulletin. SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE; SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE. GMC: UNABLE TO COMMUNICATE WITH THE EBCM DTC U0121. *NJ VEHICLES EQUIPPED WITH JL4. UPDATED 9/30/08. *PE UPDATED 6/27/11. *PE UPDATED 4/6/12. *PE
0608450102007-01-26. Service bulletin. ELECTRICAL SYSTEM:IGNITION:SWITCH. IGNITION SWITCH DIAGNOSTIC TIPS - DTC CODES C0561, P1629, P1682, U0101, U0121, U0155 AND/OR NO CRANK/NO START, HVAC, RADIO, ON STAR, POWER ADJUSTABLE PEDALS, AND OTHER ELECTRICAL COMPONENTS INOPERATIVE. *KB

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.