Question about 2000 Dodge Durango

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Transmission does not shift to overdrive

I was told the rear output speed sensor was bad. Will that effect the shifting?

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  • pjbrandi May 13, 2009

    i CHANGED THE SENSOR ON THE REAR HOUSEING WHERE IS THE OTHER DO YOU KNOW????

  • pjbrandi May 14, 2009

    I got my prob fixed by changing output sensor thnx for yal's help..

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  • 28 Answers

Yes, it has an input and output sensor and either one can cause improper shifting

Posted on May 10, 2009

  • dustang25 May 13, 2009

    i have the schematic at the shop, but i belive there are two on the driver side of the transmission on certain models. one toward the front and one toward the rear, they look identical. on other models there is only one on the trans. and one on the rear diff. i believe both designs have one on the diff though. i will double check and get back with you.

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1 Answer

The Transmission shifts very hard after the first shift. Check engine light is on as well as the Green overdrive light blinks off and on. Speed sensor was cleaned and even replaced.


Your on the right track. Have you scanned the PCM, what codes did you get? If not and you changed the vehicle speed sensor,(VSS) did you check the (OSS) output shaft speed sensor, it will cause torque converter lock up and hard shifting and that pesky OD light flashing. I have also found that clutch packs inside auto tranny's dry out. Ford and some aftermarket companies sell a fluid that will recondition the clutch packs.

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Misses badly when accelerating or under a load. shift out of overdrive on incline due to power loss


Have you checked for codes?

Any dash lights lite?

Any testing done so far?

Have to do something then tell us,can't
guess and don't have the car to drive.

You most likely have ignition issues,if the
engine is hot & your going up hills

It down shifts based on shift strategy & vehicle
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Could be egr issues

Do you ever do any preventative maintenance?

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1 Answer

Transmission seems to shift in and out of overdrive


Check the transmission fluid level. The sensor for speed may be tripping or not tripping causing the overdrive to engage or disengage at a particular speed. ---
Understanding the Hydraulic Control System The hydraulic pressure used to operate the servos comes from the main transmission oil pump. This fluid is channeled to the various servos through the shift valves. There is generally a manual shift valve, which is operated by the transmission selector lever, and a shift valve for each up shift the transmission provides.
Most automatic transmissions are electronically controlled; electrical solenoids are used to control the hydraulic fluid. The shift solenoids are regulated by an electronic control module. Shift timing is regulated through sensor feedback information provided to the electronic controller.
On older transmissions there are two pressures that control the shift valves. One is the governor pressure which is affected by vehicle speed. The other is the modulator pressure which is affected by intake manifold vacuum or throttle position. Governor pressure rises with an increase in vehicle speed, and modulator pressure rises as the throttle is opened wider. By responding to these two pressures, the shift valves cause the up shift points to be delayed with increased throttle opening to make the best use of the engine's power output.
Older transmissions also make use of an auxiliary circuit for downshifting. This circuit may be actuated by the throttle linkage, vacuum that actuates the modulator, or by a cable or solenoid. It applies pressure to the downshift surface on the shift valve or valves.
The transmission modulator also governs the line pressure, used to actuate the servos. In this way, the clutches and bands will be actuated with a force matching the torque output of the engine.

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the flashing O/D light usually means you have a bad speed sensor that sends speed info to the engine & trans computer.

Vehicle Speed Sensor The vehicle speed sensor (VSS) (Figure 42) is a variable reluctance or Hall-effect sensor that generates a waveform with a frequency that is proportional to the speed of the vehicle. If the vehicle is moving at a relatively low velocity, the sensor produces a signal with a low frequency. As the vehicle velocity increases, the sensor generates a signal with a higher frequency. The PCM uses the frequency signal generated by the VSS (and other inputs) to control such parameters as fuel injection, ignition control, transmission/transaxle shift scheduling and torque converter clutch scheduling.
-------------------------------------------------------------------
Vehicle Speed Sensor The vehicle speed sensor (VSS) (Figure 42) is a variable reluctance or Hall-effect sensor that generates a waveform with a frequency that is proportional to the speed of the vehicle. If the vehicle is moving at a relatively low velocity, the sensor produces a signal with a low frequency. As the vehicle velocity increases, the sensor generates a signal with a higher frequency. The PCM uses the frequency signal generated by the VSS (and other inputs) to control such parameters as fuel injection, ignition control, transmission/transaxle shift scheduling and torque converter clutch scheduling.

-------------------------------------------
Some trans use an OSS, Output Shaft Sensor instead of a VSS. Depends on which trans you have, 4R100 or 4R70W

Transmission Control Switch (TCS) and Transmission Control Indicator Lamp (TCIL)
The transmission control switch (TCS) is a momentary contact switch. When the switch is pressed, a signal is sent to the powertrain control module (PCM) to allow automatic shifts from first through fourth gears or first through third gears only. The PCM energizes the transmission control indicator lamp (TCIL) when the switch is off.

The TCIL indicates overdrive cancel mode activated (lamp on) and electronic pressure control (EPC) circuit shorted (lamp flashing) or monitored sensor failure.

Output Shaft Speed (OSS) Sensor
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 (PCM) to indicate transmission output shaft speed. The OSS is used for torque converter clutch control, shift scheduling and to determine electronic pressure control.

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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


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1 Answer

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1 Answer

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