Question about 2001 Saturn S-Series

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Automatic tranmission put trans into reverse or from first to second sometimes drive it shifts hard change valve body. fuse is good for line presure solnoid

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The valve body needs rebuilt, this problem is very common on these cars- around $500

Posted on May 26, 2009

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Posted on Jan 02, 2017

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1 Answer

01 chevy duramax not shifting out of first gear and gear indicator flashing when in Reverse and Drive. Pops into reverse for a second then out and Drive will go in but shifts in hard.


Valve body on the transmission is not working. There are shift solenoids attached to it that control it so look for a blown fuse first.

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CODE PO871


First thing tomorrow, take it back to the shop that rebuilt it!!

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sounds like you need a trans rebuild over drive and second ard the first to go out that leavrs you with first and third but you will never get it out of first as far as reverse that is what is left when you loose first reverse dosent go thru the valve body

Aug 30, 2012 | 2002 Chrysler PT Cruiser

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Hello, names gary, recently bought 97 oldsmobile bravada and am having tranny problems. when started from cold tranny shifts great in all forward gears, and reverse works normal. when up to normal temp,...


STUCK 2-3 SHIFT VALVE , STUCK THROTTLE VALVE LINE BIAS VALVE OR REVERSE BOOST VALVE IN VALVE BODY STUCK.GO TO AUTO PARTS STORE BUY SOME TRANSMISSION ADDITIVE THAT YOU CAN POUR IN TRANSMISSION THAT WILL FREE STUCK SHIFT VALVES IN THE TRANSMISSION.

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When put my automatic 2001 Saturn SL1 into reverse it makes a Loud clunk noise before it reverses also it clunks before accelerating into the next gears..? why?


2001 Saturn SL1. Transmission (automatic) shifts hard when putting it in gear and every gear there after. The only codes I get is PO442 and PO410. Any help would be greatly appreciated.

Jul 08, 2010 | 1999 Saturn SL

1 Answer

I have top of the 2004 impala indy ss.transmission fluid and filter change 6mnths ago at 62000 miles now have 67k.tranny is slipping sometimes any easy fixes


Soft shifting, gradual performance degradation: Poor line pressure rise due to leaking boost valve, clogged EPC filter screen, failing EPC solenoid, or worst case: leaky seals throughout. Seal restorer may fix last problem. Also try a transmission flush with BG brand products (Firestone stocks it).
Chances are the boost valve may be leaking or a bad EPC valve. (EPC Electronic Pressure Control valve). Try not to drive the transmission to hard as to ensure you do not do any further damage which would cause in the transmission rebuilt.
Replacing the boost valve or EPC valve is easy once the transmission pan is dropped. Put a line pressure gauge (visit a local trans shop) on the pressure test port and go for a drive to verify proper line pressure. Base pressure at idle in P,N,OD should be around 70psi and around 140psi in R. Max line pressure should be at least 190psi at WOT in 1st or 2nd, 225psi is optimum. If base pressure is low, trans or pump is worn out. If max pressure is low, check EPC solenoid. If reverse is slow to engage, and line pressure does not come up to at least 130psi in reverse, replace the boost valve.
Thank you for using fixya and good luck.

Apr 18, 2010 | 2004 Chevrolet Impala

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MY 95 SATRUN SL2 SHIFTS HARD JUST HAVING PUT A


It's possible, especially if the used trans sat unused for a while. When you change the filter, make sure that the trans has fresh, proper fluid.

Mar 21, 2010 | 1993 Saturn SL2

1 Answer

THE TRANS WHEN HOT SOMETIMES SHIFTS HARD BUT NOT ALL THE TIME COULD THIS BE A BAD SHIFT SOLENOID ?


No it could be a bad TPS or EPC valve.
Check TPS (throttle position sensor) for smooth and linear electrical response over the entire range of motion. If the response is jumpy or erratic at all, replace TPS. If not, your EPC (Electronic Pressure Control) solenoid failed or has a dirty screen. Easy fix in pan. Fix as soon as possible or hard parts will eventually break.
Before guessing at transmission problems, check the fluid level (car warmed up, engine running in Park on level ground) and have the PCM scanned for trouble codes FIRST.
Secondly, put a line pressure gauge (or visit a local trans shop) on the pressure test port and go for a drive to verify proper line pressure. Base pressure at idle in P,N,OD should be around 70psi and around 140psi in R. Max line pressure should be at least 190psi at WOT in 1st or 2nd, 225psi is optimum. If base pressure is low, trans or pump is worn out. If max pressure is low, check EPC solenoid. If reverse is slow to engage, and line pressure does not come up to at least 130psi in reverse, replace the boost valve with a Transgo 0.500" boost valve (easy fix in pan).
Thank you for using Fixya and good luck. Keep me posted, be glad to help you get your truck running 100% again soon.

Mar 20, 2010 | 1997 GMC Sierra

1 Answer

Shifts hard only some times when cold or hot from 3rd to over drive the truck has 130,000 miles and is a 2000 chevy silverado 2500 6.0L


1-2 shift is delayed and harsh, may not shift into OD: Check TPS for smooth and linear electrical response over the entire range of motion. If not, replace or EPC (Electronic Pressure Control) solenoid failed. Easy fix in pan. Fix as soon as possible or hard parts will eventually break. Start with the simple and check the transmission fluid level and condition.Secondly, put a line pressure gauge (or visit a local trans shop) on the pressure test port and go for a drive to verify proper line pressure. Base pressure at idle in P,N,OD should be around 70psi and around 140psi in R. Max line pressure should be at least 190psi at WOT in 1st or 2nd, 225psi is optimum. If base pressure is low, trans or pump is worn out. If max pressure is low, check EPC solenoid. If reverse is slow to engage, and line pressure does not come up to at least 130psi in reverse, replace the boost valve with a Transgo 0.500" boost valve (easy fix in pan).
No 1st or 4th available; trans shifts 2nd to 3rd by itself in D or OD and locks the converter : ShiftA solenoid failed. Easy fix in the pan. Or a wiring problem from PCM to trans.. or PCM.

Good luck and keep me posted.

Feb 17, 2010 | 2000 Chevrolet Silverado

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