[2nd Gen : 91-95]: Dodge Transmission Mystery
Amateur
Joined: Jul 2018
Posts: 27
Likes: 1
2) Multi-function switch can be tested for continuity. There is a table in the manual.
3) Turn Signal Flasher
4) Power Distribution Center (20 Amp Fuse 6)
5) Run/Accessory 12v+
6) Battery
Rookie
Joined: Nov 2019
Posts: 75
Likes: 1
Hey @master tech
I've had my 1997 b3500 5.9 for a couple years now and since I've owned it right at around 78mph on the nose, every time, when hit that speed it will give me a little hiccup for about half a second. If I keep it at that speed it will continue to give me this little hiccup intermittently but from what I can tell at no consistent interval.
Once I am either above that very specific speed or below it, it won't do it at all.
It hasn't really bothered me, ill either just drive above that point or below that point and carry on my way, just always been curious what it may be. I suppose it may not even be transmission at all.
I've had my 1997 b3500 5.9 for a couple years now and since I've owned it right at around 78mph on the nose, every time, when hit that speed it will give me a little hiccup for about half a second. If I keep it at that speed it will continue to give me this little hiccup intermittently but from what I can tell at no consistent interval.
Once I am either above that very specific speed or below it, it won't do it at all.
It hasn't really bothered me, ill either just drive above that point or below that point and carry on my way, just always been curious what it may be. I suppose it may not even be transmission at all.
Amateur
Joined: Jul 2018
Posts: 27
Likes: 1
May be the throttle position sensor (TPS)
- Key On
- Check volts at center terminal with voltmeter - may want an analog needle sweep type
- 350-900mv at idle, 4.5v at WOT, but what you want is to move the throttle slowly through the range to look for a dead spot.
- The other way to do this is by data logging the TPS using an OBDII reader and Torque Pro
Last edited by FlynDodge; Jul 6, 2021 at 03:15 PM. Reason: Atrocious spelling
Rookie
Joined: Nov 2019
Posts: 75
Likes: 1
May be the throttle position sensor (TPS)
- Key On
- Check volts at center terminal with voltmeter - may want an analiog needle sweep type
- 350-900mv at idel, 4.5v at WOT, but what you want is to move the throttle slowly through the range to look for a dead spot.
- The other way to do this is by datalogging the tps using an OBDII reader and torque pro
Registered User
Joined: Aug 2021
Posts: 1
Likes: 1
Trany not down shifting. Stays in 3rd
Very vague about where this splice is. A schematic on how it is soppse to be wiire would be nice. Where it is coming from off the top to second pack. MAbey run new wires and avoid wire harness all together.
Registered User
Joined: Feb 2024
Posts: 1
Likes: 0
92 dakota
hello all, this is my first post and i really need help here.
Long story short... 1995 dodge caravan 3.3L in my garage, third transmission in it (not replaced by me)... same problem, Limp in mode- P0755.
replaced: transmission (twice), shift solenoid, shift solenoid harness, TCM, tested various wires... still no luck, then i come across the article below:
SERVICE ALERT FOR MOPAR TRANSMISSIONS BETWEEN 1990 AND 1999: It has been determined that in over 91% of the transmission problem cases reported (limp mode) that the problem is due, not to mechanical problems within the transmission, but is due instead to a faulty inline wiring harness splice from the factory. The wire from the TCM, the second wire from the solenoid pack and the third wire from the ECU was wired together at the factory when it was determined that there was a communications error to the ECU which is a factory/design flaw.
So on the production floor, a last minute repair was approved to correct the problem. This three wire splice is located in the wiring harness just on top of the transmission down by the three wires that connect to the three plugs located between the radiator and the tranny (or in the region about 12 inches under the battery). Follow the three wires from the front of the tranny and you'll see them disappear into a plastic wiring harness cover about a foot away from where they plug into the tranny. This wiring harness goes into a T junction with another wiring harness. Peel off the entire outer plastic conduit harness covering the T junction about 8 inches in all three directions and you will be able to see the other three wires wired together in a makeshift splice under some factory electrical tape. Peel that tape off and you will discover that the splice is corroded. Because of this corroded factory last minute splice which said corrosion appears about between 30,000 and 120,000 miles depending on how wet your geography is, the ECU cannot communicate with the solenoid pack that goes to the transmission so irregular shifting occurs, namely Limp Mode.
Most certified mechanics only detect the fact that the solenoid pack is not getting a signal or the ECU is not sending a signal so they think that either the solenoid pack is bad or the ECU is bad. They are wrong in both cases. Un-splice the three wires, cut off the corroded wire ends, cut back the insulation to the three wires and RE-SPLICE THEM. Then cover them with new tape. Now the tranny coil pack can receive messages from the ECU to shift the tranny. It’s that simple! ! ! ! ! ! ! Your eternal problem has now been permanently solved and your tranny will shift like new! ! ! ! One other thing, on some Mopar vans this simple problem that causes real havoc in these beautiful vans is the ground wire to the tranny is corroded and must be cleaned or replaced as it causes that same exact symptom of limp mode due to a bad connection.
If people making their complaints on this page knew this, they would still love their vans because they can fix it themselves. Mopar corporation knew this but cannot admit to it as it would cause the largest recall in U.S. history of any vehicle. Now you know what Mopar should have told every Caravan and Voyager purchaser from the get go, clean 3 little wires and problem solved.
can anyone tell me if there is any truth to this, i am about to rip my hair out and drive the van over a cliff
Thanks so much, and i apologize ahead of time because i don't usually have to resort to asking for help.
Long story short... 1995 dodge caravan 3.3L in my garage, third transmission in it (not replaced by me)... same problem, Limp in mode- P0755.
replaced: transmission (twice), shift solenoid, shift solenoid harness, TCM, tested various wires... still no luck, then i come across the article below:
SERVICE ALERT FOR MOPAR TRANSMISSIONS BETWEEN 1990 AND 1999: It has been determined that in over 91% of the transmission problem cases reported (limp mode) that the problem is due, not to mechanical problems within the transmission, but is due instead to a faulty inline wiring harness splice from the factory. The wire from the TCM, the second wire from the solenoid pack and the third wire from the ECU was wired together at the factory when it was determined that there was a communications error to the ECU which is a factory/design flaw.
So on the production floor, a last minute repair was approved to correct the problem. This three wire splice is located in the wiring harness just on top of the transmission down by the three wires that connect to the three plugs located between the radiator and the tranny (or in the region about 12 inches under the battery). Follow the three wires from the front of the tranny and you'll see them disappear into a plastic wiring harness cover about a foot away from where they plug into the tranny. This wiring harness goes into a T junction with another wiring harness. Peel off the entire outer plastic conduit harness covering the T junction about 8 inches in all three directions and you will be able to see the other three wires wired together in a makeshift splice under some factory electrical tape. Peel that tape off and you will discover that the splice is corroded. Because of this corroded factory last minute splice which said corrosion appears about between 30,000 and 120,000 miles depending on how wet your geography is, the ECU cannot communicate with the solenoid pack that goes to the transmission so irregular shifting occurs, namely Limp Mode.
Most certified mechanics only detect the fact that the solenoid pack is not getting a signal or the ECU is not sending a signal so they think that either the solenoid pack is bad or the ECU is bad. They are wrong in both cases. Un-splice the three wires, cut off the corroded wire ends, cut back the insulation to the three wires and RE-SPLICE THEM. Then cover them with new tape. Now the tranny coil pack can receive messages from the ECU to shift the tranny. It’s that simple! ! ! ! ! ! ! Your eternal problem has now been permanently solved and your tranny will shift like new! ! ! ! One other thing, on some Mopar vans this simple problem that causes real havoc in these beautiful vans is the ground wire to the tranny is corroded and must be cleaned or replaced as it causes that same exact symptom of limp mode due to a bad connection.
If people making their complaints on this page knew this, they would still love their vans because they can fix it themselves. Mopar corporation knew this but cannot admit to it as it would cause the largest recall in U.S. history of any vehicle. Now you know what Mopar should have told every Caravan and Voyager purchaser from the get go, clean 3 little wires and problem solved.
can anyone tell me if there is any truth to this, i am about to rip my hair out and drive the van over a cliff
Thanks so much, and i apologize ahead of time because i don't usually have to resort to asking for help.
