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2003 Grand Am Automatic will shift normal from 1-2 but will not shift into 3 or 4.

The transmission will shift normally in Drive from 1-2, but then will not shift any higher... when you let off the gas, it goes into like neutral... then you have to rev up high again for it to go again... it has to rev match the speed for 2nd gear, then it will accelerate again... even taking it to redline in 2nd gear will not upshift to 3rd gear or 4th gear... will not shift manually either... works normal in 1st and 2nd upshifting and downshifting... but will not ever go into 3rd or 4th. reverse is fine. transmission does not slip. no check engine light. is there a sensor or something that tells it when to shift from 2-3 that is bad? where are the sensors located?

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  • david buxton Nov 02, 2012

    I checked the computer for fault codes... I have a P0141 O2 heater circuit bank 1 sensor 2 fault... That is the only fault code... I guess there are 2 O2 sensors... Which one is the Bank 1 Sensor 2?? would this cause the transmission not to shift into 3 or 4?? Didn't think it would be related...

  • david buxton Nov 02, 2012

    I don't think my scanner will check for transmission codes... Just check engine faults... Do I need to bring it to a trans shop for them to scan the trans for fault codes??



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  • Pontiac Master
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Worn clutches or solenoid issues if it is an Alison style box.

Posted on Apr 02, 2017


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Posted on Jan 02, 2017


SOURCE: The transmission is hanging up in 2nd gear and not

The absence of 3rd and 4th is imposed by the transmission computer as a precautionary measure. The system has detected fault and rather than risk doing any greater damage has provided a limp home service. It needs to have a transmission specialist look it over and read the error codes. How do your transmission fluid levels look?

Posted on May 28, 2010

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SOURCE: 1998 Dodge RAM 1500 won't upshift, slips out of gear

have you dropped the pan to see whats the bands are set at, any debris in pan bottom, whats your governor pressure, if bands are ok, but gov pressures are not relative to speed 1 psi per mph up to 95-127psi, port is on pass side of case rear top right, scan tool would be very helpful, your must have mil light on for this problem, gov dtc's, replace gov transducer as gov solniod as a pair, no exceptions, also are there any 02 sensor dtc's, shorted to voltage, this wil make pcm do stupid things to trans shift, affecting gov signals. GOOD LUCK RDJRP

Posted on Aug 03, 2009

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SOURCE: 1997 pontiac grand am 4t60e goes to neutral during acceleration

Check the transmission fluid.make sure the car is at operating temperature and in park.go to parts store and buy transmission filter kit. automatic transmission works on fluid pressure if it is restricted the tramsmission won't shift right.the fluid and filter are to b changed usually between 40 to 50k miles

Posted on Jul 26, 2012

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