K 1500 Truck 4WD V6-262 4.3L (1991)
C. O. No.
91-206
Date:
September 10, 1991
SUBJECT:
PRODUCT EMISSION CAMPAIGN 91C23
THROTTLE POSITION SENSOR
TO:
Service & Customer Satisfaction Managers DAC Managers
GOAL:
To inspect and correct all units involved as indicated in the attached Emission Campaign Bulletin.
ACTION:
Dealers are to inspect and/or repair the vehicles as described in the bulletin.
DUE DATE:
C. O. CONTACT PERSON: R. J. Evanch, Product Campaign Manager, Technical Service Department, 8-227-6595
General Motors has been determined that certain 1991 Chevrolet C/K, R/V & P trucks and-G vans with 4.3L, 5.7L or 7.4L fuel-injected gasoline
engines, coupled with Hydra-Matic 4L80 electronic transmissions (MTI), may have a Throttle Position Sensor (TPS) which exhibits intermittent low
output voltage. This condition may cause the transmissions in these vehicles to have no upshift to 4th gear, no TCC, or harsh transmission shifts.
To correct this condition, dealers are to inspect and, if necessary replace, the TPS switch according to instructions contained in the bulletin.
Parts required to complete this campaign are to be obtained through General Motors Service Parts Operations (GMSPO).
The attached recap indicates the number of vehicles involved in each Branch.
RECAP 91C23
BRANCH
INVOLVED UNITS
2
NEW YORK
2067
3
ST. LOUIS
1052
4
MINNEAPOLIS
2829
5
KANSAS CITY
1643
6
SAN FRANCISCO
2553
7
DALLAS
3183
8
ATLANTA
2197
9
CINCINNATI
2723
10
DENVER
1947
11
CHICAGO
4726
13
PITTSBURGH
1377
14
WASHINGTON
1237
15
PHILADELPHIA
1724
16
CHARLOTTE
1219
17
MEMPHIS
1413
19
PORTLAND
2777
20
LOS ANGELES
7414
26
TAMPA
1601
30
HOUSTON
1902
