Terraza FWD V6-3.5L VIN 8 (2005)
Valve Body: All Technical Service Bulletins
A/T - 4T65E Poor Performance/Harsh Shifts/DTC's Set
Incorrect Transmission Shifts, Poor Engine Performance, Harsh 1-2 Upshifts, Slips 1st and Reverse, Torque Converter Clutch (TCC) Stuck Off/On,
DTCs P0757, P0741, P0742, P0730, P0756
# 02-07-30-013E - (May 20, 2005)
Models:
2001-2005 GM Passenger Cars with 4T65-E Automatic Transmission
2001-2005 Buick Rendezvous
2005 Buick Terraza
2001-2004 Chevrolet Venture
2005 Chevrolet Uplander
2001-2004 Oldsmobile Silhouette
2001-2005 Pontiac Aztek, Montana
2005 Saturn Relay
with 4T65-F Transmission (RPOs M15, MN3, MN7, M76)
This bulletin is being revised to include additional diagnostic information and clarify model usage. Please discard Corporate Bulletin Number
02-07-30-013D (Section 07 -- Transmission/Transaxle).
Condition
Some owners may comment on any one or more of the following conditions:
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The SES lamp is illuminated.
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The transmission slips.
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The transmission does not shift correctly, is very difficult to get the vehicle to start moving or the engine lacks the power to move the vehicle.
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Poor engine performance.
Cause
The most likely cause of the various conditions may be chips or debris:
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All years--Pressure Reg. Valve (Bore 1) or Torque Signal Valve (Bore 4) stuck
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On 2001-2002 vehicles, a plugged orifice on the case side of the spacer plate.
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ON 2003-2005 vehicles, restricted movement of the 2-3 shift valves in the valve body.
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On 2003-2005 vehicles, restricted movement of the 3-4 shift valves in the valve body.
Technician Diagnosis and Correction
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The technician's road test reveals the vehicle launches in third or fourth gear (high RPM with slow vehicle acceleration).
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On 2001-2002 vehicles, a DTC P0756 or P0757 may be stored.
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On 2003-2005 vehicles, a DTC P0730, P0741, P0748 or P0757 may be stored.
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Refer to the appropriate Service Information (SI) for additional Diagnostic Assistance.
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With a Tech 2(R) connected to the vehicle, road test the vehicle and perform the following steps:
If the above symptoms are present proceed with the following steps.
1.
With the valve body removed and on a workbench, carefully push the valve against spring pressure to check if the valve will snap back to the
original position. Or for the valves seated in home position, use a small flat-bladed screwdriver and carefully pry the valve off its seat, quickly
remove the screwdriver allowing the valve to return to its seat. If the valve does not snap back unencumbered, then the valve will need to be
removed from the valve body.
