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Fred
Dodge Dakota
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9/05/2002
20:22:59
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 Subject: How to change output speed sensor?
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Hi everyone, I need some help, I got a check engine light last night, and autozone got a 0720 OBDii code= "output speed sensor malfunction". What is the proper way to change this part? is it a simple-pull it out and replace? or is there some other info that I need to change it?
Any help is appreciated!
Thanks, Fred. (99 4x4 cc 5.2L auto trans)
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Fred
Dodge Dakota
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9/14/2002
11:55:40
|  RE: How to change output speed sensor?
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Just for everyone's information, this is a quick/easy process (5.2L auto)take the wire harness off then you need a 1" deep socket and you take it out (a little tranny fluid comes out, but not enough to worry about) and replace it, plug the wire harness back onto it and reset the PCM and you are done.
Fred.
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Carrie Smith
Dodge Dakota
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8/16/2003
01:08:05
| RE: How to change output speed sensor?
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My 1999 automatic Dakota has the check engine light on, with the diagnostic trouble code reading p0720(output speed sensor circuit malfunction). I have hesitation in my vehicle automatically shifting gears. I had a friend replace a speed sensor, but I don't know if it's the right speed sensor..since the check engine light was reset, and came back on, still having the hesitation also. I would like to know exactly what the OUTPUT speed sensor is, and if I can get that at the auto parts easily?..please anyone email me at care01@hotmail.com if u might know about this, Thank you
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Mykr
Dodge Dakota
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8/16/2003
12:22:38
|  RE: How to change output speed sensor?
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The trouble codes are better defined below. All of the following info is however extracted from the 2001 Factory Service and Diagnostic Manuals, and I'm not sure if it would be the same for 1999.
This may not answer your question directly, but it may provide more details.
There are four pages of troubleshooting guidleines for the 45RFE transmission relating to this trouble code. Of course most require the use of special tooling etc to accomplish. They do also indicate that flashing the TCM with the latest software can often clear up these codes.
P0720 (M) Low Output SPD Sensor RPM, Above 15 MPH
The relationship between the Output Shaft Speed Sensor and vehicle speed is not within acceptable limits.
P0720 (M) Low Output Spd Sensor RPM Above 15 mph
Output shaft speed is less than 60 rpm with vehicle speed above 15 mph (4-speed auto. trans. only).
Possible causes are listed below
1) Intermittant wiring and connectors
2) Output speed sensor signal circuit open
3) Speed sensor ground circuit open
4) Output speed sensor signal circuit short to ground.
5) Speed sensor ground circuit short to ground
6) Output speed sensor signal circuit short to voltage
7) Speed sensor ground circuit short to voltage
8) Output speed sensor
9) TCM- Output speed sensor
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Steven Saum
Dodge Dakota
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8/16/2003
21:46:39
|  RE: How to change output speed sensor?
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I have a 99 Dakota sport, with almost 75,000 miles. My brake light, abs light, and the check engine light are always illuminated, and speedometer not functioning, along with fuel gauge at times not working properly...hooked up to diagnostic test, read p0500 vehicle speed sensor malfunction, however, does not tell me which speed sensor is defective?..Any help or suggestions anyone could give would be greatly appreciated, my email address is shatow35@hotmail.com, thanks
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Mykr
Dodge Dakota
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8/16/2003
23:27:54
| RE: How to change output speed sensor?
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In my opinion the P0500 DTC is related to a different speed sensor then the output speed sensor in the discussions above. In the documentation that I have read it is indicating that the rear wheel speed sensor may be the culprit in your case. However, you may have more than one issue going on here. All info will be as it relates to the 2001 Dakota only. I do not have info on the '99.
Possible Causes of the P0500 DTC are as follows:
1) Controller Antilock Brake (CAB) DTC's are present.
2) Intermittant Vehicle speed signal
3) Vehicle Speed signal circuit open
4) Vehicle Speed signal circuit shorted to ground
5) Vehicle Speed signal circuit shorted to voltage
6) CAB-VSS
7) PCM-VSS
If there are any DTC's spresent from the Antilock Brake controller the smart instrument cluster will keep the antilock brake lamp and the red brake warning indicator illuminated.
All codes from the Antilock Brake Controller (CAB) must be cleared first in order clear up the P0500 DTC from the PCM.
All of this can be caused by the rear wheel speed sensor on the rear axle.
This is only a portion of the information that is in relation to this code.
There is more information available for locating and testing this sensor if needed. Let me know.
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Gray
Dodge Dakota
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11/06/2003
10:08:30
| RE: How to change output speed sensor?
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I'm having the same problem, first the abs and brake lights came on and my speedometer didn't work. Then driving down the road, I'd hit a bump and my electric door locks would lock by themselves and the speedomoter would rev up and then go back down. Soon the engine light came on and it's giving me the P 0500 code. I'm wondering if mine has something to do with the wiring not the sensor. Is there any sure fired way to tell?
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I dunno
Dodge Dakota
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11/06/2003
17:32:07
| RE: How to change output speed sensor?
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But you should name your truck "Christine".
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shinnysideup
Dodge Dakota
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11/06/2003
19:42:45
| RE: How to change output speed sensor?
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I had the same problem with the ABS, brake light, and speedo. I did not check the code but replaced the sensor on the rear axle and the problem was solved.
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Dakota_John
Dodge Dakota
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2/08/2004
12:16:58
| RE: How to change output speed sensor?
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I've got a 98 2WD Dak with the 5.2. My tranny was shifting late, about 3500 tpm under easy throttle....couple days later, Check Engine....
Went to the guys at autozone to get the code free (gotta love that free part) and it came up with p0720 "The PCM had determined a malfunction in the output speed sensor."
Except I can't seem to find the part, the auto stores keep shaking their heads and saying "must be a dealer rip-off part, we don't have one"
what do I do?
Any help would be great,
John
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Xlien
Dodge Dakota
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4/28/2004
15:09:55
| RE: How to change output speed sensor?
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i am having the same problem with the ABS, brake light, and speedo and cruise control replaced the pcm vss and now i am gettng ready to purchase the rwss to see if this solves the problem..also was wondering if the rwss is located inside the axe or does it sit on the outside somewhere?
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L
Dodge Dakota
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4/28/2004
15:24:20
| RE: How to change output speed sensor?
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Check any and all wiring and connectors to
anything on rear axle..
Sensors should not ' fail' like this !!!
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ian
Dodge Dakota
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5/07/2004
03:34:52
| RE: How to change output speed sensor?
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I also have a 99 dodge dakota 5 speed 2WD.
I have no Speedometer, odometer, tripmeter, engine and abs light remains on. Also, Whenever i put it to neutral to slow down and break, my engine cuts off. When I start it back, it goes bakc to the right idle about 700 + RPM. Sometimes it doesnt cuts off but goes below 500 RPM and tries to increase the idle so not to cut the engine. I have no problem when im on gear or in when I start the engine. I dont think its a fuel problem. I also have a P500 error which is a speed sensor problem. Are all these problems interralated to the speed sensor?
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ticats
Dodge Dakota
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5/07/2004
06:46:05
| RE: How to change output speed sensor?
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Ian...you need to replace the vss/abs sensor which is on top of your differential case.
Putting your gear into to neutral does not slow down the truck nearly as well as lifting off the gas and letting the gearing slow the truck. You are only creating a lot more effort and wear on the brake pads by putting it in neutral.
Under certain circumstances, the computer does a fuel cut when slowing down. I think that it may not be a full fuel cutoff but one bank of injectors is shut down.
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another mark
Dodge Dakota
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5/07/2004
12:27:20
| RE: How to change output speed sensor?
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The output shaft speed sensor is on the transmission on the
side. You can only get this from the dealer I have not seen it at
any store on online. The rear wheel speed sensor is on the top
of the differential. You can get this online and at your typical
auto parts store for less than the dealer.
www.partsamerica.com has it
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BUBBA
Dodge Dakota
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5/08/2004
00:22:40
| RE: How to change output speed sensor?
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I have a similar problem with my '95 4x4 318, the speedo and tach. and odo. will sometmes go out, but may come back on while driving. one day I hit a bump and they came back on and the air bag light flashed. This does affect the other guages accuracy, but they do work. Someone told me a volt limiter on the back of the inst. panel is bad, but I don't know. any one have an idea? Thanks.
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Shaun
Dodge Dakota
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5/10/2004
01:15:47
| RE: How to change output speed sensor?
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To answer a couple questions out there, Chrysler uses 3 sensors between the engine and wheels to measure speed. Input, Output and Vehicle Speed Sensor. Input compared to output lets the ECM know if there are any bands or clutches slipping. When the input or output sensors fail, it is not uncommon to get "stuck" in second gear all the time and have a bunch of "first gear out of range", "second gear out of range" etc.. codes. When the VSS dies, the ABS, speed control (cruise), speedometer, automatic door locks, and probably a couple things I'm forgetting are all affected, including engine idle as the ECM uses this signal to establish deceleration/acceleration. Hope this helps in your diagnostics.
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Dan
Dodge Dakota
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5/29/2004
11:14:31
| RE: How to change output speed sensor?
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As far as prices for the output speed sensor, I went to a local Dodge dealer, who had plenty of them in stock, and it cost about $17 dollars.
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another mark
Dodge Dakota
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5/29/2004
13:50:15
| RE: How to change output speed sensor?
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There is no input speed sensor for the 99 and possibly the 97
and 98 and beyond also.
When I went to the dealer to buy my output speed sensor the
parts guy thought I wanted that part too, but looked and
determined that year doesn't have one. Old thread anyway but
good info.
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ticats
Dodge Dakota
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5/29/2004
15:00:23
| RE: How to change output speed sensor?
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The 97s have an output speed sensor as well as a vss, both are on the tranny. The input speed sensor is inside the tranny. In 98s and up, the vss was moved to and incorporated with the abs on the rear diff. casing.
This thread, while originally started back in '03, was restarted again with a post from ian in May 7 '04.
ticats, burlington, ontario
97 Dak CC Sport, 5.2L, 44RE, 4.56SG, race weight 4120 lb, 13.98 @ 99.85
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skinch
Dodge Dakota
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8/18/2004
19:58:52
| RE: How to change output speed sensor?
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hey i have a 99 dakota 106000k, had the same probs with spedo and abs brake light, one problem with changing rear speed sensor on top of the rear differential.The old switch broke in half trying to pull it out, but with patience and a small pick {like a dental pick} got the plastic body out of the hole, and all is well spedo is fine and bkake abs lights are off ...chrysler part 5014787AA
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