Electra V6-231 3.8L VIN C SFI (1988)
Engine Control Module: Customer Interest
MIL ON, Intermittent TCC, DTC 62/26 Set
Bulletin:
90-7125-5
Date:
Apr. '90
Ref. No.: 90-106-7125
Corp. Ref. No.: 077108
SUBJECT:
INTERMITTENT TCC, NO TCC, CODE 62 AND/OR 26 AND SERVICE ENGINE SOON LIGHT
MODELS AFFECTED: 1987-90 MODELS EQUIPPED WITH HYDRA-MATIC 3T40 (THM 125C)
BULLETIN COVERS:
A New Spiraled Roll Pin used in the 2nd Gear Switch (338) replaces the previous split roll pin, which may become loose and fall out of the switch,
causing possible intermittent and/or no TCC, Service Engine Soon Light, and/or Code 62 and/or Code 26.
DATE OF PRODUCTION CHANGE:
Figure 1
The 2nd gear switch has a three (3) digit code stamped on top of the switch (metal side). The first two (2) digits in the code represent the week in which
the switch was built; the 3rd digit represents the calendar year. All switches built with number Date Stamp 429 (November 29, 1989) and after will
contain the new spiraled roll pin. (Figure 1)
2nd Gear switches equipped with new spiraled roll pins went into production in all Hydra-Matic 3T40 (THM 125C) transaxles on Julian Date 333
(November 29, 1989).
SERVICE PROCEDURE:
Do not attempt to repair suspect gear switches equipped with split roll pins. If an inoperative 2nd gear switch is found in any Hydra-Matic 3T40, (THM
125C) replace it with a new one.
SERVICE PARTS INFORMATION:
Part Number
Description
8664388
Switch, 2nd Gear
Parts are currently available from GMSPO.
SERVICE MANUAL REFERENCE:
Whenever replacing a 2nd gear switch on any Hydra-Matic 3T40, (THM 125C) refer to the Unit Repair Section of your Service Manual.
