Question about 2004 Pontiac Sunfire

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Car suddenly lost forward power and auto transmission works only in reverse

2.2 L engine - no prior issues with transmission whatsoever to suggest a problem was developing. Just lost power going up a hill and would not engage in any of the forward gears.

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

SOURCE: 2006 Pontiac G6 GTP Transmission Drive Not Working

trans usually coupled (electroically) with engine revs. check computer chip. perform computer diagnostics.

Posted on Jul 30, 2008

localwonder
  • 6784 Answers

SOURCE: car won't drive forward or in reverse

this is the speed shift solenoid and a possible faulty transmission filter as well. the best thing for this issue is to pull the tranny and check for filter clogs and change the shift solenoid.

Posted on Mar 10, 2009

Blackberry_U
  • 223 Answers

SOURCE: transmission will not go in reverse

Sounds like your gear is gone in your transmission...it will need replacing.

Posted on Jun 03, 2009

drsinister69
  • 2317 Answers

SOURCE: I have a 1997 Pontiac

Sounds like the clutch is going out. I would check the operation of the clutch slave cylinder. Also check the clutch master cylinder fluid level.

Posted on Oct 18, 2010

  • 3 Answers

SOURCE: No power accelerating or going up a hill

I have problems with mine too kinda the same this up hills,on ramps and occationally when i put it in park after driving. it sounds like somones in it reving it and letting off i changed the throttle positioning sensor,fuel filter,cut the cat converter off,replaced air filter and it shows no codes anytime i get it scanned i need some advice i dunno what else to do

Posted on Oct 10, 2011

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will need a jeep service center
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There a many popping noises and it could be Engine but since you lost Reverse at the same time...

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Hello. As you know, the transmission is one of the more sophisticated components in any auto. It takes the most transmission pressure to engage reverse, third, and fourth gear in an auto tranny. In an auto tranny, the shifter is connected to a linkage that manually shifts between the different gears in the transmission. When you shift into reverse, all transmission pressure is concentrated to engage reverse. When you shift to drive the transmission will operate normally, building pressure until it can shift into the next gear. With third, second, or first gear selected it will lock out all higher gears (Unless the TCU detects overrevving of the engine, in which case it will override gear selection and upshift to avoid engine damage). All the TCU does in a modern auto tranny is control shift points. Years and years ago, shifting was controlled by a spring attached to the gas pedal. When the gas pedal was depressed, the spring would expand. As tranny pressure grew, the spring would become compressed until it was fully compressed, engaging the next gear. The harder you stepped on the gas, the longer you went until the tranny shifted. In modern transmissions the TCU dictates shift points, and not much else. The TCU will also control when the torque converter will lock, but that's where it's duties end. The problem with engaging reverse is either a linkage issue, or a problem with the pump not building enough pressure to fully engage reverse.

Try putting the shifter in reverse, holding the brakes firmly, and giving the car gas. If the car reaches a higher RPM and suddenly slams into reverse it is the pump. The pump will only build enough pressure to engage reverse with higher RPM's. If the pump is severly damaged it won't engage at all, but if this is the case it probably won't engage third or fourth gear either at that point. If the problem is with the linkage, reverse just won't engage whatsoever, despite RPM's. I'd say start with the shift linkage. If it's bent or misadjusted it could cause reverse to not be fully engaged. The TCU doesn't control reverse at all, since there are no shift points and no need for the torque converter to lock.

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It sounds like you may have lost your water pump or your thermostate may have gone bad too. Regardless if your going to change your water pump your going to have to change the thermosate too. 
As for the transmission it could be your spider gears , there weak in the 700R4 and other you lose your reverse first with had lurchs when put in to drive. Sorry for the bad news, good luck

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