Question about 1986 Mercedes-Benz S-Class

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Mercedes transmission transmission is sometimes staying in second gear and will not upshift mainly when it is warm

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  • Anonymous Mar 29, 2014

    Problems with transmission doesn't ship sometime sometimes doesn't go

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All mercedes from the 80s engines start out in second gear

Posted on Aug 27, 2008

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How do I fix the transmission in a 94 Cougar XR7 4.6 V8 that wont shift pass second gear.


It is very likely that a complete rebuild is needed along with a flush out of debris and a new torque converter.

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Why is my Mercedes E350 transmission stuck in limp mode?


transmission may need an update-new data from factory gear--a diagnostic scan will show issue-vehicle specific equipment is used found at private shops--stay clear of dealers-techsnot that xperiencd----unplug the computer and clean the pins then reconnect and see if issue stops-its a common practice on older cars-kinda like a reboot

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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?...


Here is what the service manual says about the EPC solenoid, the processor looks at allot of different inputs to command the solenoids, such as Throttle Position Sensor, Vehicle Speed Sensors, Transmission Range Sensor and RPM signal, The PCM controls the shift patterns for the transmission. Electronic Pressure Control (EPC) Solenoid
The electronic pressure control (EPC) solenoid is located on the main control valve body and is controlled by the PCM. The EPC controls line pressure used to apply and release clutches and bands in the transmission.
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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2 Answers

My 1994 Voyager does not want to upshift. It stays in 2nd gear. I used to be able to let it warm up, turn it off, restart it and it would shift. It is now stuck and will not go into 3rd gear. It seems this...


The solenoid for upshifting to higher gears is likeley to be bad. The VSS or speed sensor can be tested by driving the vehicle and observing the speedometer representing accurate speed.

This sensor is used for shift points as well.

I think the transmission needs to be flushed and filled for about $100 or so at shop that does this service.

If that does not solve the problem, a rebuild or replacement transmission will be necessary to fix the problem, if you plan on keeping the car.

Warming it up to get it to shift gives me hope that maybe changing the fluid will help, but can't guarantee it will solve the problem completely.

Transmission must be torn down and rebuilt, in my experience.

Nov 12, 2010 | 1994 Plymouth Grand Voyager

1 Answer

Transmission stays in overdrive at stop. have to


The torque converter lock up solonoid is bad. This is an internal transmission part that requires partial transmission disassembly. Most times its cheaper to put a good used transmission in.

Mar 11, 2010 | 1996 Ford Aerostar Extended

1 Answer

Car wont upshift out of 2nd gear, sometimes when


it sounds like you have a faulty ignition switch

Sep 11, 2009 | 1999 Chrysler 300M

1 Answer

700R4 automatic transmission won't upshift


Check the TV cable, it may need to be adjusted or it may be binding and jammed. There could also be a problem with a broken governor gear since it's made of plastic, driver's side near the back of the main case under a round case. If it's is the governor gear replace it with the roll pin and filter just to make sure there are no broken parks that may have been caught by the filter. Good luck and hope this helps. 

Jul 03, 2009 | 1992 Chevrolet G20

1 Answer

Transmission trouble


Transmission model is a 4R70W,totally electronic,no vacuum to the trans.A common failure on that transmission is the 1-2 accumulator springs...they break,causing a harsh 1-2 upshift.An accumulator is a mechanical/hydraulic assembly also called an accumulator piston.It is made from steel with rubber lip seals bonded to the steel.The accumulator piston takes a certain portion of the hydraiulic fluid produced when the 1-2 upshift happens,and strokes up and down with springs providing resistance.It acts as a hydraulic shock absorber for the 1-2 upshift,providing cushion.When the springs break,it no longer provides shock absorption,hence the harsh upshift.It is located just inside the trans pan,on the passenger side front of the case.It is retained in the case with a cover and a round snap ring about 2" in diameter.A new piston and springs can be purchased from a transmission repair shop,or better yet,have them check the assembly for broken springs.Good luck

Sep 04, 2008 | 1999 Ford Crown Victoria

2 Answers

HYUNDIA 1997 ELENTRA 1.8


http://www.2carpros.com/how_to/transmission_service_4.htm
Popular Problems Checks
1. Car will not go into gear:
  • Gear selector cable has failed
  • Brake lock solenoid has failed not allowing the gear selector to move out of "Park"
  • Excessively low transmission fluid (note: if car is operated for an extended amount of time with low fluid level the transmission will fail prematurely)
  • Shorted electrical component not allowing the PCM to control the transmission. Example: shorted fuse
  • Flex plate (flywheel) is broken completely not transferring engine power to the transmission.
2. Car goes into gear but then fades out of gear or is slipping while driving:
  • Transmission fluid is low
  • Transmission clutch discs or bands are worn out or burned
  • Faulty transmission shift solenoid.
3. Car goes into gear but does not shift out of first:
  • Blown fuse to the PCM controller
  • Faulty vehicle speed sensor (VSS)
  • Shorted second gear control solenoid
  • Faulty transmission controller (PCM)
Tips About Common Problems and Fixes

Jun 21, 2008 | 1997 Hyundai Elantra

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