Question about 1998 Chevrolet Malibu

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Transmission problems car is shifting funky at low speeds. It down shifts and upshifts frequently. Do you think it is the speed sensor?

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I've had great luck with transmission additives in old cars. I'm trying to put one in mine. I cannot find where to add it. If you know, I'm at maclif@hotmail.com

Posted on Apr 17, 2009

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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.

Mar 23, 2013 | Cars & Trucks

1 Answer

Cold auto Transmission won't shift into 3 gear until after driving 1 mile or so (driving at about 35 mgh) pickup then downshifts from 3 to 2nd then back to 3rd a few times untill I get to work (7 miles...


Sounds like a bad speed sensor. Perform an ODBII scan soon. ECU should delay upshift until coolant temp senses warm up. It will not work right unless a signal is present from speed sensor.

May 22, 2017 | 1992 Mitsubishi Mighty Max

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 does not upshift. Shifts from park to reverse to neutral to drive but does not upshift from 1st gear. 117000 miles on the odometer HELP!!!


Sounds like one of the speed sensors are bad. It has an input speed sensor and an output shaft speed sensor. You need to have the TCM scanned for codes to see if one of them is bad.

Oct 30, 2010 | 1991 Dodge Dynasty

1 Answer

2000 dodge stratus tranny problems


there is no up shift sensor or down shift sensor,
there is a output sensor,input sensor,speed sensor,
you need to have your TCM checked to see which of these are at fault.

Dec 28, 2009 | 2000 Dodge Stratus

1 Answer

1994 Buick Regal "shudders" while driving/ won't always up-shift


It is a 24 year old vehicle (made in 94), it probably needs to retire :>)

Take it to a transmission specialist rather than a normal garage, as it sounds like a sensor problem. It may also be rubber mountings that have perished, and the engine and transmission are only partially mounted to the chassis.

Mar 16, 2017 | 1994 Buick Regal Gran Sport

1 Answer

The green overdrive light on the dash keeps flashing and the transmission jerks into gear. Any suggestions on how to solve this. The test codes that come are P1747, PO156, and PO161. I have already...


not an oxygen sensor



vehicle speed sensor or oss is most likely cause.


Output Shaft Speed Sensor (OSS) 7H103: The output shaft speed (OSS) sensor is a magnetic pickup, located at the output shaft ring gear that sends a signal to the powertrain control module to indicate transmission output shaft speed. The powertrain control module uses this signal for torque converter clutch control, shift scheduling, used in determining EPC pressure. Symptoms: No converter engagements, harsh shifts, abnormal shift schedules. DTC: P0720, P0721 std~us~en~file=d14110a.gif~gen~ref.gif


Vehicle Speed Sensor (VSS) 9E731: The vehicle speed sensor is a magnetic pickup that sends a signal to the powertrain control module. This VSS signal tells the PCM vehicle speed. The PCM uses this signal to modify upshift schedules. Symptoms: Shift engagement/disengagement (hunting) on grades. DTC: P0500, P0503, P1500, P1501, P1503

Mar 15, 2009 | 1996 Ford Thunderbird LX

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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