1996 Corvette: Service Bulletin: 3 - 2 Part Throttle Downshift Flare

Subject: Service Bulletin: 3 - 2 Part Throttle Downshift Flare (Replace 3 - 2 Solenoid)
Model and Year:
1996 BUICK ROADMASTER
1996 CADILLAC FLEETWOOD
1996 CHEVROLET CAMARO, CAPRICE, CORVETTE
1996 PONTIAC FIREBIRD
1996 OLDSMOBILE BRAVADA
1996 CHEVROLET AND GMC C/K, M/L, S/T, G MODELS WITH HYDRA-MATIC 4L60-E (RPO M30)
1996 HOLDEN COMMADORE "VS"
Source: Chevrolet Dealer Service Bulletin
Bulletin Number: 67-71-47

**IMPORTANT: CANADIAN DEALERS SHOULD REPAIR TRANSMISSIONS FOLLOWING ESTABLISHED REPAIR PRACTICES.

CONDITION:

(FIGURES 1 AND 2)

SOME OWNERS OF THE ABOVE MODELS WITH A HYDRA-MATIC 4L60-E TRANSMISSION (BUILT BEFORE MAY 24, 1996/JULIAN DATE 6145) MAY EXPERIENCE AN ENGINE SPEED FLARE OF 1000-2000 RPM, DURING A PART THROTTLE DOWNSHIFT AT 19-31 MPH. THIS CONDITION WILL NOT SET ANY DTC’S (DIAGNOSTIC TROUBLE CODES).

CAUSE:

EXHAUST SEAT ON THE 3-2 CONTROL SOLENOID BACKING OUT.

CORRECTION:

(FIGURE 3)

REPLACE THE 3-2 CONTROL SOLENOID. JULIAN DATE ON THE SOLENOID WILL BE MAY 13, 1996 (6134) OR LATER.

PARTS INFORMATION:

NEW PART NUMBER DESCRIPTION
24209121 SOLENOID, 3-2 CONTROL

PARTS ARE EXPECTED TO BE AVAILABLE ON JULY 1, 1996 FROM GMSPO

FIGURE 1 - HYDRA-MATIC 4L60-E TRANSMISSION IDENTIFICATION INFORMATION FIGURE 2 - HYDRA-MATIC 4L60-E TRANSMISSION IDENTIFICATION INFORMATION FOR TWO-PIECE CASE FIGURE 3 - LOCATION AND IDENTIFICATION OF THE 3-2 CONTROL SOLENOID ON THE CONTROL VALVE BODY

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.