Question about 2003 Pontiac Grand Am

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My automatic transmission wont shift out of second gear, anyone got any ideas? I have been told it is the transmission control module, have also bee told it is the ignition module

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  • Kevin lewis Sep 18, 2016

    Thanks for all the help guys, the transmission shifts like a dream from 1st to 2nd. But will not come out of second. I'm a genius with engines.....but know nothing of transmissions. I took it to my mechanic for a full diagnostic. Top to bottom.

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  • Pontiac Master
  • 53,755 Answers

Run the fault codes
could be a TCM but more likely a servo/ solenoid for the gear
I would say that the car is running so ignition module will not be in the equation

Posted on Sep 18, 2016

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Posted on Jan 02, 2017

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Anonymous

  • 87 Answers

SOURCE: my transmission wont down shift

change fluid an filter, if thats not yer problem ya got tranny problems ya need to get checked out by a tranny shop

Posted on Aug 05, 2009

Toyota Ed

  • 1861 Answers

SOURCE: 2000 pontiac montana wont go into 4th gear

I would be interested in knowing if the thermostat is sticking open. Most Overdrives are prevented from engaging until the coolant temperature is over 177 degress F. Check you temp gauge...does it read Low? If so, change the t'stat, and see if that fixes your problem, or, if that does not help, get a complete transmission FLUSH, BEFORE you go out and get a rebuild. You just might save a ton of money.

Posted on Aug 29, 2009

Shaun Plencner

  • 126 Answers

SOURCE: 06 pontiac g6 won't shift out of first gear (automatic trans)._

you might want to take that to a transmission shop and it sounds like the tranny is going out

Posted on Sep 01, 2009

Anonymous

  • 3 Answers

SOURCE: 2006 PONTIAC G6-TRANSMISSION JERKING

I have the exact car w/same exact problem. I was told that ist was the speed sensor, which just so happens to be located inside the transmission w/a $400. repair bill.

Posted on Oct 07, 2009

John P Schwantes Jr

  • 1509 Answers

SOURCE: transmission wont shift to second gear

The vacume hose on the vacume modulater on the trans mission is nt hooked to full engine vacume or the engine isn't making vacume.The governer will make the trans shift to second anyway at redline but it's preety hard on an old car to redline it just to find out/ It's possible that youv'e got the shift detent cable that hooks to the carb set too tight or it's stuck as if it's floored. with the cable disconnected it should shift out al the way real early as long as thirs vacume on the modulater. Gas mileage freaks that drive around slowly unhook th shift cale so the trans shifts into high gear real early. Not much for passing and acceleration but they get a little bit better gas mileage.

Posted on Sep 22, 2010

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Tip

My car does not shift in second gear.


Hi.

The first thing to do is replacing the transmission fluid. Metal debris inside the transmission box gets mixed with fluid and can cause similar problems.

The automatic transmission uses throttle position sensor to determine position and opening of throttle.
IF throttle position sensor is defective, the car may have problems shifting into one or more gears.

The automatic transmission is controlled by an electronic control module, that is energizing a set of solenoids to shift into gears.
The control module is a rectangular box, often located behind the dash and wired to transmission. The solenoids are attached to valve body,inside transmission.

If a solenoid is defective, or if control module is defective, the car may have problems shifting into one or more gears.

Problems concerning transmission control module, TPS and transmission solenoid are usually detectable reading fault codes stored on the car main control module (ECU/ECM).

Transmission problems are often returning a code p0700 after an OBDII scan.

Stored codes can be retrieved using an OBD scan reader.
If the car auto transmission is not shifting into gear, talk to the mechanic about the problem.
Only when the car has a really high mileage, or when there is a factory problem there is need to replace the gearbox.
A damaged gear box at low mileage is rather unusual.

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The transmission control module is responsible for correct shifting of transmission.it is on side of tranny. the throttle position sensor takes all the necessary measurements and sends it over to the Electronic Control Module on transmission to make it shift, if its ok! Try by changing the shift module on transmission. If this will not work check or change the TPS and check for a bad wire also. Hope this helps you out! God-Bless!

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Reset transmission


It could be the Powertrain control module (PCM) if you have an automatic transmission or the synchro if it's a manual one, in that case you would probably hear a grinding noise when shifting. As for the reset button, I did not hear of a such thing but you could try reading the code using a code scanner (I think you'll need the OBD2 connector one) and reset it. Check the sensor connectors on the trans for any looseness. Make sure you have enough oil in there as well, automatic trans work with hydraulic pressure....not enough hydraulic pressure mean no gear shifting. Hope I helped!

Best regards, Sam

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Electronic pressure control solenoid circuit p1745. Check engine light on 2000 ford escort, 4cl, automatic. Advance auto told me it was a dealer part but I can't find it on any of the ford websites?...


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The 2-3 shift solenoid is located on the main control valve body and is switched on and off by electrical signals from the PCM. The 2-3 shift solenoid activates the 2-3 shift valve which controls the automatic shifting between second and third gear. Second gear is established when the 2-3 shift solenoid is switched on. The 2-3 shift solenoid is switched off when vehicle speed increases and requires a second to third gear upshift.
The 3-4 shift solenoid is located on the main control valve body and is switched on and off by electrical signals from the PCM. The 3-4 shift solenoid activates the 3-4 shift valve which controls the automatic shifting between third and fourth gear. Third gear is established when the 3-4 solenoid is switched off. The 3-4 shift solenoid is switched on when vehicle speed increases and requires a third to fourth gear upshift.

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1 Answer

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I hope this helps!

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