Corsica L4-121 2.0L (1988)
Transmission Position Switch/Sensor: Customer Interest
MIL ON, Intermittent or No TCC, DTC's 62, 26 Set
Number:
90-201-7A
Section:
7A
Date:
March 1990
Corp. Bulletin No.: 077108
Subject:
INTERMITTENT TCC, NO TCC, CODE 62 AND/OR 26 SERVICE ENGINE SOON LIGHT
Model and Year:
1987-89 A, J, L AND 1990 W CAR AND U-VAN WITH 3T40 (125C) AUTOMATIC TRANSMISSION
Figure 1
This bulletin covers a New Spiraled Roll Pin used in the 2nd Gear Switch (338) which 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.
The 2nd gear switch has a 3 digit code stamped on top of the switch (metal side). The first 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)
Second Gear switches equipped with new spiraled roll pins went into production in all HYDRA-MATIC 3T40 transaxles on Julian Date 333 (November
29, 1989).
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,
replace it with a new one.
Part Number
Description
8664388
Switch, 2nd Gear
Parts are currently available from GMSPO.
Whenever replacing a 2nd gear switch on any HYDRA-MATIC 3T40, refer to the Unit Repair Section of your Service Manual.