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the over drive is controlled by a servo/solenoid that sometimes fails
It could be a TCM problem
It is not an indication of a failing transmission unless you have more indications you have not mentioned and if diagnosed by an accredited transmission shop should be fairly cheap to fix.
It is worth fixing
Fuse # 20 or 21 gets power through ignition. This fuse controls PRNDL indicator, speedometer, tach, & will cause transmission to not shift gears correctly. Ours took off in 3rd gear when put in Overdrive & only ran in 3rd gear. If we tried to manually shift thru gears (auto trans), it had 1st, 3rd, reverse. No 2nd or over drive. Replaced ignition. Fixed problem. Root problem was Electric motor that engaged 4 wheel low side was bad. Every time we used 4 Low side it threw power surge through ignition & blew ignition out. Good Luck.
Hello, this vehicle uses a HydraiMatic 4T65-E, it is a 4 speed automatic with electronic torque converter lock up
SRTA Tag Location
Transmission ID Location
Hydra-Matic 4T65-E ID Tag
Shift Built A = First Shift; B = Second Shift; C = Third Shift
Serial Number in Base Code 31
W = Warren Plant
Line Built 1 = Line 1; 2 = Line 2; 3 = Line 3; 4 = Line 4
SRTA Metal Tag
have 1995 pontiac bonniville sse fuel all the way to injectors will run if you put fuel into intake then starts and runs till fuel runs out. I have replaced fuel pump and fuel pump filter,cam postion sensor and coil paks
all "gears" in your transmission depend upon hydraulic pressure to keep them engaged. if od clutch is worn or burned, or pressure is escaping at an internal seal it can cause the problem you have. Always be sure that fluid is full and is not burned. If it seems OK, have the unit checked by a reliable shop...there is nothing "user friendly" except perhaps a fluid and filter change that can be done on your transmission.