Tranny randomly disengaged as if in neutral
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From: Ohio
Transmission randomly disengaged as if in neutral
Hello, I know there have been threads posted for the DTCs but my symptoms seem a bit different so I am posting a new thread.
I am getting the P1763 DTC as well as the P1740. I had issues less than two years back with the tranny shifting erratic and sometimes not at all and ended up buying a kit that included the following to fix the issue:
Governor Pressure Solenoid - Borg Warner Upgrade HD
Governor Pressure Transducer (Sensor) - Oem Mopar # 56028196AD
Lock-Up and Overdrive Solenoid With Harness - Rostra , Oem Reference # 52118500AB
Output Speed Sensor with O-Ring Installed - Oem Reference # 4800879
3-4 Accumulator Spring .126" , Upgrade
Filter
Duraprene Pan Gasket
My truck is a 2001 Dodge Ram 2500 HD 4x4 QC with the 5.9L Gas Engine. The P1740 code references the Governor Pressure Sensor which you will see is part of the kit above so I am skeptical that it needs replaced a second time in less than two years. Not sure.
My current issues surfaced when I drove the truck about 25 miles to my brother's place. All was fine getting there. I parked it and then a little later drove it to town and back (5 miles). It still seemed fine. About 15 mins after getting back I had to drive uptown again. When I headed out, it seemed ok for the first 100 yards or so and then the RPMs briefly shot up above 3000 like the truck had been placed in neutral. I let off the gas and it settled. I kept going and the issue reoccurred (and got worse or more frequent) several times to the point where the tranny acted completely disengaged and I had to play with the floor and column shifters to get it moving so I could get back to my brother's house. I ended up having to be towed home and just pulled it into the barn and parked it. I bought the truck new in '01 and it only has 42k miles on it but the bands have never been adjusted so I plan to do that now. I did install a shift kit in it within the first year or two that I had it and then replaced the parts included in the rebuild kit mentioned above in late 2011.
I dropped the pan and do not see any large particles and the fluid is not burnt or discolored.
Any thoughts on what might be going on? Thank you in advance for your help and time!
I am getting the P1763 DTC as well as the P1740. I had issues less than two years back with the tranny shifting erratic and sometimes not at all and ended up buying a kit that included the following to fix the issue:
Governor Pressure Solenoid - Borg Warner Upgrade HD
Governor Pressure Transducer (Sensor) - Oem Mopar # 56028196AD
Lock-Up and Overdrive Solenoid With Harness - Rostra , Oem Reference # 52118500AB
Output Speed Sensor with O-Ring Installed - Oem Reference # 4800879
3-4 Accumulator Spring .126" , Upgrade
Filter
Duraprene Pan Gasket
My truck is a 2001 Dodge Ram 2500 HD 4x4 QC with the 5.9L Gas Engine. The P1740 code references the Governor Pressure Sensor which you will see is part of the kit above so I am skeptical that it needs replaced a second time in less than two years. Not sure.
My current issues surfaced when I drove the truck about 25 miles to my brother's place. All was fine getting there. I parked it and then a little later drove it to town and back (5 miles). It still seemed fine. About 15 mins after getting back I had to drive uptown again. When I headed out, it seemed ok for the first 100 yards or so and then the RPMs briefly shot up above 3000 like the truck had been placed in neutral. I let off the gas and it settled. I kept going and the issue reoccurred (and got worse or more frequent) several times to the point where the tranny acted completely disengaged and I had to play with the floor and column shifters to get it moving so I could get back to my brother's house. I ended up having to be towed home and just pulled it into the barn and parked it. I bought the truck new in '01 and it only has 42k miles on it but the bands have never been adjusted so I plan to do that now. I did install a shift kit in it within the first year or two that I had it and then replaced the parts included in the rebuild kit mentioned above in late 2011.
I dropped the pan and do not see any large particles and the fluid is not burnt or discolored.
Any thoughts on what might be going on? Thank you in advance for your help and time!
Last edited by Chevy2Dodge; Jul 20, 2014 at 08:48 PM.
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From: Clayton MI
While you are in there.... have a look at the 8 pin connector, (internally, and externally) if that looks good, make sure you don't have any chafed wires under the pan. If that looks good too, replace the pressure sensor anyway.
Verify you are getting a good 12 volts to the solenoids down there as well.
Verify you are getting a good 12 volts to the solenoids down there as well.
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From: Ohio
HeyYou, thank you for your suggestions; it is appreciated. I checked the harness and wiring and all looks fine visually. Can you advise how I check voltage at the sensor? The harness has four wires (black, green, yellow, red) and I have no idea which contacts to place the voltmeter leads on to test. I found this during my searches as well but don't know the schematic of the sensor harness.
So, some basic testing should be conducted. Got a voltmeter?
1. Check the output voltage of the governor pressure sensor Key On Engine Off (KOEO). It should be less than 0.7 volts. If not...
2. check the sensor ground. It should have less than .05V.
3. Check the reference voltage. It should be 5.0V.
If the sensor ground and reference signal is OK but the return voltage is off, the governor pressure sensor is faulty.
Ideally, I'd like to try and test the sensor with the voltmeter so I don't have to replace parts that may not be faulty. Let me know your thoughts, thanks!
-Chad
So, some basic testing should be conducted. Got a voltmeter?
1. Check the output voltage of the governor pressure sensor Key On Engine Off (KOEO). It should be less than 0.7 volts. If not...
2. check the sensor ground. It should have less than .05V.
3. Check the reference voltage. It should be 5.0V.
If the sensor ground and reference signal is OK but the return voltage is off, the governor pressure sensor is faulty.
Ideally, I'd like to try and test the sensor with the voltmeter so I don't have to replace parts that may not be faulty. Let me know your thoughts, thanks!
-Chad
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Joined: Apr 2010
Posts: 87,475
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From: Clayton MI
'bout the only way I know of to test the sensor in operation, is with the trans buttoned up, full of fluid, etc. Either use a scanner, to see what the PCM thinks pressure is, or have a meter where you can read it going down the road. (or creatively simulate going down the road.)
I am sure the sensor just modifies the voltage, by varying the resistance across the circuit... could test and see if it is just open, but, you also have the possibility that it is an intermittent problem, and the test may show it is good, under those conditions, but, get it hot, and it fails....
I am sure the sensor just modifies the voltage, by varying the resistance across the circuit... could test and see if it is just open, but, you also have the possibility that it is an intermittent problem, and the test may show it is good, under those conditions, but, get it hot, and it fails....
