Question about 1999 Oldsmobile Alero

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1999 alero ive got the serv eng light on the codes that are stored are 758 and 1860 the tranny is shifting hard.

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Code 758 is 2-3 shift solenoid circuit. 1860 istorque converter clutch pulse width modulator solenoid circuit.

Posted on Mar 23, 2009

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the shifting solenoids inside the tranny will make the check engine light go off. Check the wires leading into the tranny and if necessary you may have to go inside the trans to inspect the shift solenoids. It's odd you do not have shifting problems,. neither did I - yet the wire was broke inside and wound up eventually burning off the terminal to the shift solenoid..
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2002 Alero shifting hard


I have a 1999 Oldsmobile Alero and my car was running rough and stalling. Also when the car was shifting, it was making a "thud" sound. My service engine light was on, so I took it to Autozone to run their diagnostic tool. It came back with code P0108 and they advised me to check my vacuum hoses as a possible solution. I looked and found that my air hose running from my throttle body to my map sensor was disconnected. I reconnected the hose and the engine ran normally and didn't make any "thud" sound when shifting. My car is back to normal. So check your hoses. If its still running rough, you may need to replace your map sensor.

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valve body could be sticking.if computer sees a problem with tranny it will go into failsafe mode which means full line pressure this causes a hard shift. there is a repair kit for valves in the valve body

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1 Answer

1999 Olsmobile Alero


sounds like bad clutches in trans...tranny shop needed...takes 4 qts for a filter change and remember to check it when the vehicle is warm and in park running.

Jul 19, 2008 | 1999 Oldsmobile Alero

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