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Service bulletin 030730001

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10000943
Published by NHTSA2003-04-05
Manufacturer's number030730001
Manufacturer's date2005-03-01
Replaces030730001A
NHTSA componentPOWER TRAIN:AUTOMATIC TRANSMISSION

NHTSA's summary

TRANSMISSION SLIPPING OR TORQUE CONVERTER CLUTCH (TCC) INOPERATIVE WITH NO SERVICE ENGINE SOON (SES) LIGHT DISPLAYED AND NO DIAGNOSTIC TROUBLE CODE (DTC) P1870. *TT UPDATE. *TT

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Transmission and driveline, Automatic transmission

Trouble codes named

P1870

Vehicles listed
CHEVROLET TRAILBLAZER2003
GMC ENVOY2003
OLDSMOBILE BRAVADA2003

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
03V0750002003-03-06. POWER TRAIN:AUTOMATIC TRANSMISSION

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
06-00-89-031D2021-09-07. Service bulletin. OEM and Remanufactured Engine and Automatic Transmission/Transaxle Identification
06-00-89-031D2021-04-20. Service bulletin. OEM and Remanufactured Engine and Automatic Transmission/Transaxle Identification
PIP3366C2018-08-20. Service bulletin. This Preliminary information communicates to the dealer technician thatLight Duty Trucks equipped with automatic transmissions and 4 wheel drive may exhibit a condition of grinding/ratcheting type noise when shifting the automatic transmission into park while the transfer case is in 4 wheel drive low (4LO) range. Dealers technician's are advised this condition should be deemed a normal characteristic of 4WD low operation.
02-07-30-052J2017-08-15. Service bulletin. This informational bulletin provides technicians with information regarding automatic transmission oil cooler flow test essential tool J-45096 TransFlow®.
PIT-47222008-12-18. Service bulletin. GMC: FLUID LEAK FROM TRANSMISSION OIL COOLER LINES DUE TO CORROSION. ALL 2000-2006 LIGHT DUTY TRUCKS EQUIPPED WITH THE LIGHT DUTY AUTOMATIC TRANSMISSION. *PE
30612008-01-31. Service bulletin. DTC C0327 WITH OR WITHOUT ADDITIONAL DTC'S SETTING. WITH FOUR WHEEL DRIVE (4WD) ONLY. *NJ
31362007-02-22. Service bulletin. SLIP CONDITION IN 2ND, 3RD, OR 4TH. DAMAGED 2-4 OR 3-4 CLUTCH. *KB UPDATED 10/31/07. *NJ
0507300312006-01-11. Service bulletin. 4L60-E AUTOMATIC TRANSMISSION TORQUE CONVERTER CLUTCH (TCC) SHUDDER, WATER IN TRANSMISSION (REPAIR TRANSMISSION AND REPLACE TRANSMISSION FILLER TUBE, LEVEL INDICATOR AND SEAL). *AK
35162005-11-05. Service bulletin. VIBRATION FELT AND HEARD AT LOW RPM DURING PARKING LOT MANEUVERS. *TT
112020032005-04-13. Service bulletin. RATTLE NOISE UNDERNEATH THE VEHICLE OR AN AUTOMATIC TRANSMISSION FLUID LEAK. *EH