Friday, August 7, 2026
RecallGazette

Vehicle problems, recalls & safety intelligence

Chevrolet Avalanche 2007–2010technical service bulletin

Bulletin PIP-4653 B · NHTSA communication 10032434 · issued Jun 1, 2011

Technical service bulletin
communication type
Power Train
component
2007–2010
model years
30
vehicle entries

Official summary

Buick/chevrolet/hummer/gmc/pontiac/cadillac/saturn: technicians may find dtcs p0601, p0603, p0604, p062f or p1621 stored in the tcm as an active or a history code. Some of these dtcs can also be set in the ecm or fpcm. Make sure that you know which module (for example ecm, fpcm or tcm) has set the dtc before attempting to diagnose and repair this condition. *pe updated 8/1/11. *pe

What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.