Transmission problems

Tiny
MICHELE KENNEDY
  • MEMBER
  • 2000 JEEP GRAND CHEROKEE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 180,000 MILES
Hello, my transmission started taking longer to shift from second to third then third to fourth. Finally got a check engine light checked the codes and it was the pressure sensor. Took it to a shop and got it and the governor sensor replaced. The pressure sensor was changed last year as well. At first (the first drive to the house) it shifted normal, then it started to slowly take longer and longer to shift. So what else can be the problem? It does not slip or downshift once it shifts.
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Thursday, March 30th, 2017 AT 5:53 PM

12 Replies

Tiny
CARADIODOC
  • EXPERT
Need to know the exact fault code number. The common mistake is fault codes never say to replace parts or that one is bad. They only indicate the circuit or system that needs further diagnosis, or the unacceptable operating condition. When a part is referenced in a fault code, it is actually the cause of that code only about half of the time. You must first look for wiring and connector terminal problems, and other related causes.
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Thursday, March 30th, 2017 AT 6:00 PM
Tiny
MICHELE KENNEDY
  • MEMBER
Thanks for replying. The code was p1762. Last year it gave me p1763. That sensor was replaced. The shop replaced it again with the gov sensor.
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Thursday, March 30th, 2017 AT 9:59 PM
Tiny
DOCFIXIT
  • EXPERT
May not be sensor failure, computer constantly measures voltage to sensor if it reads improper voltage in three consecutive drive cycles it sets code. So when sop cleared codes it was okay until after third cycle then code set and shifting was off. Have shop follow diagnostic procedure OHM check internal wiring harness. Think that is where problem is.
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Friday, March 31st, 2017 AT 10:19 AM
Tiny
MICHELE KENNEDY
  • MEMBER
Okay thanks, I appreciate it.
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Friday, March 31st, 2017 AT 4:56 PM
Tiny
CARADIODOC
  • EXPERT
P1762 - Gov Press Sen Offset Volts Too Low or high.

Yup. This type of fault code is usually set due to a wiring problem. There is a specific range of voltages a sensor can send. If it sends the wrong voltage, but within that acceptable range, that is typically due to a mechanical problem it is detecting the results of, and you will notice a symptom related to performance. The sensor will detect the condition, but it's working properly to be able to do that.

To send a signal voltage outside that acceptable range can only occur due to a break in that circuit. That break can be inside the sensor, but it is much more common to find loose or corroded connector terminals, cut wires, or corroded splices. This is why fault codes never say to replace a part. They only point to the circuit that includes that part.

To add to the misery, if the problem is caused by corroded connector terminals, as an example, replacing the sensor requires that connector be unplugged. The scratching action can form a clean area for the terminals to make a good connection again, for a few weeks or months. Replacing the sensor is not what solved the problem. Unplugging it and reconnecting the plug is what temporarily solved the problem. This is where some people become angry because they incorrectly assume the new parts are failing repeatedly.
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Friday, March 31st, 2017 AT 5:35 PM
Tiny
MICHELE KENNEDY
  • MEMBER
What is the sensor on the drives side just behind the transmission pan at the sticker for the transmission? Is it just a regular speed sensor or the output speed sensor? Going to try to add a picture below.
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Tuesday, April 4th, 2017 AT 9:52 AM
Tiny
MICHELE KENNEDY
  • MEMBER
This one
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Tuesday, April 4th, 2017 AT 9:54 AM
Tiny
DOCFIXIT
  • EXPERT
That would be the output speed sensor.
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Tuesday, April 4th, 2017 AT 10:58 AM
Tiny
MICHELE KENNEDY
  • MEMBER
Okay thanks. The wires were bare and touching. But the end that goes into the sensor looks burnt so I am thinking I should replace the sensor too.
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Tuesday, April 4th, 2017 AT 11:38 AM
Tiny
KEN
  • ADMIN
Yes you should.

Please let us know what you find so it will help others.

Best, Ken
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Thursday, April 6th, 2017 AT 4:50 PM
Tiny
MICHELE KENNEDY
  • MEMBER
Ok fixed the wire and replaced the sensor. Still doing the same thing. Any suggestions?
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Monday, April 10th, 2017 AT 8:48 PM
Tiny
KEN
  • ADMIN
Hello,

This sounds like it could be a partially plugged catalytic converter which messes which the engine vacuum. Here is a guide so you can do some testing.

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

Please let us know what happens.

Best, Ken
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Tuesday, April 11th, 2017 AT 9:44 AM

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