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Service bulletin 020730033A

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 id10000459
Published by NHTSA2003-02-27
Manufacturer's number020730033A
Manufacturer's date2002-11-01
Replaces020730033
NHTSA componentPOWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM)

NHTSA's summary

TRANSMISSION CONTROL MODULE (TCM) WILL NOT COMMUNICATE WITH NON-TECH 2 SERVICE OR TEST EQUIPMENT. *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, Transmission control module

Vehicles listed
CADILLAC CTS2003

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

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
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33922005-09-28. Service bulletin. THE 5L40E AND 5L50E AUTOMATIC TRANSMISSION MAY EXPERIENCE A CONDITION OF HIGH TCC SLIP SPEED AND OR DTC P0741. *TT UPDATED 09-26-07. *KB
6102005-08-11. Service bulletin. TRANSMISSION OIL COOLER LINE FITTING. GM TECH LINK. *TT
010142004-08-24. Service bulletin. DRIVELINE/EXHAUST GROWL/MOAN NOISE AT SPEEDS OF APPROXIMATELY 35-45 MPH (56-72 KM/H) IN 5TH GEAR WITH THE TCC APPLIED. *TT
0407300122004-08-14. Service bulletin. TRANSMISSION FLUID CHECKING PROCEDURE FOR 5L40-E AND 5L50-E AUTOMATIC TRANSMISSIONS. *TT
008362004-07-06. Service bulletin. 5L40E 5L50E TRANSMISSION- HIGH TCC SLIP SPEED AND OR DIAGNOSTIC TROUBLE CODE (DTC) P0741 HIGH TCC SLIP SPEED. *MJ
015942004-06-03. Service bulletin. 5L40E HARSH 3- 2 DOWN SHIFT.*MR
018312004-05-07. Service bulletin. 5L40E, 5L50E AUTOMATIC TRANSMISSION REVISED FLUID LEVEL CHECKING PROCEDURE. *MR
0307300592004-03-04. Service bulletin. LOSS OF DRIVE OR REVERSE, LOSS OF TRANSMISSION FLUID, NOISE WHEN SHIFTED INTO DRIVE OR REVERSE. *TT