Question about 2005 Chevrolet Impala

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Shifting hard after stopping

It doesnt do it all the time. i was told it could be pressure control.

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First check for transmission oil level

Posted on Apr 22, 2014

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06 pontiac grand prix shifting hard off a dead stop


If all gears are shifting hard, may have a code p1811 set-trans adapt long shift. When this code sets it commands full line pressure causing hard shifts. Usually the pressure control solenoid is at fault. You need to have it scanned for codes.

Nov 21, 2012 | 2006 Pontiac Grand Prix

1 Answer

Our 2005 Pontiac Grand Prix is hard shifting. The diag codes that came up are trans codes P1811c and P1819c. Does anyone know what these codes mean? I'm having an impossible time finding them. Thanks in...


The codes mean that the Electronic Pressure Control Solenoid is going bad. The computer detects that the shifts are taking longer than 0.65 seconds. Then the computer commands maximum line pressure to avoid burning out the clutches, hence the hard shifting. My 2002 Grand Prix had the same problem, and I had great luck just installing a shift kit to speed up the shifting and haven't had any further issues.

Nov 27, 2010 | 2005 Pontiac Grand Prix

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Where do i find the shift solenoid on an 05 impala ls with a 3.8? car shifts hard when stopped at light and go to take off. like its in to high of a gear and then slams and jerks into 1st. however it...


all of the shifting solenoids are in side the tranny, by the sounds of if you might be able to try a service on the tranny, new filter and fluid might help alot. try that first before spending alot of money.

Nov 18, 2009 | 2005 Chevrolet Impala

1 Answer

99 Chevy Venture Slams when shifting


If the van shifts ok when cold but hard when hot then the pressure control valve in the trans is bad. When the fluid temp climbs past a certain point the PCS sensor shorts out and stops controlling fluid pressure. This usually causes a whine from the trans (pump) and hard shifting. This is because the PCS can no longer control the pump pressure so the pump now runs at full pressure and shifts as if you were using full thottle all the time - the opposite of what your doing, which is to feather the throttle trying to ease the shift. So now the trans calls for a full pressure shift when your using part throttle and it slams. The (PCS) part is cheap enough but the trans has to be removed to replace it and that's not cheap.

Give this a shot, it often works and it's cheap enough to try.

First, have a good mech carefully check the rediator trans cooler section to be sure there's no leakage of coolant from the enging to the trans coller section of the radiato. This is important!, if antifreeze is leaking into the trans fluid via the cooler it'll cause problems that are otherwise impossible to diagnose and eventually complete trans/torque converter failure.

If there's no radiator problem then power flush the trans and change the filter, then install an aftermarket trans cooler in series with the built in cooler (the instructions with the cooler detail this). It's about $60 for the cooler and maybe one hour to install it.

This whole process will drop the trans fluid temperature 40-50 degrees and often that's enough to get back into a temperature range that will allow the PCS to work reliably again.

If it doesn't work your not out much, if it does work you'll probably get another couple of years out of it.

Al







Jun 24, 2009 | 1999 Chevrolet Venture

1 Answer

Transmission doesnt shift abs & brake light on speedometer doesnt work


I had the same problem with ABS light and speedometer, I was told that it is the transmission control module. It has not yet stopped shifting but I have had times where it just wont stay running. It will start and then stall. Hope this helps.

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The dealer should know this! The EPC solenoid (controls pressure) hangs up with wear and causes the harsh shifts.

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92 Buick lesabre 97000 miles, on slow acceleration, @ 40mph going into 4th gear there is a mild chutter, same @ 50mph going into OD mild chutter and when down shifting from OD to 4th. All is when slow acceleration. When I say slow acceleration, I mean I drive like a older senior citizen when everyone behind me is annoyed I don't just donor and go. When I do romp to accelerate quicker, there is no chutter at all. Fluid is good and at perfect level. Any ideas? Great car just wondering the scoop is

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Monte carlo


transmission shift solenoid

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