Overdive problem?
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Overdive problem?
I'm troubleshooting my Cummins 5.9L Ram, My engine is running great but I hit 48-49 mph the overdrive kicks in for a second then the tranny kicks overdrive right off. I like to believe there's a loose wire somewhere or a electrical communication is going out but what electrical part?
http://youtu.be/A4aszvUNVm8
http://youtu.be/A4aszvUNVm8
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Joined: Nov 2010
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From: Charleston, SC
you might have better luck by posting this in the correct section(this is one is not for tech issues). also the 2nd gen ram section is mostly gassers so you would also probably have better luck in the cummins section.
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Joined: Sep 2006
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From:
I have a '95 with a V-10 and my tranny won't shift into OD at all. I did some searching on the interweb and I found this little jewel of information. So far I have adjusted my TPS and it didn't fix the tranny but it did improve starting and drivability. It might give you a few things to look at. One of the things I learned is that the 2nd gen ram trannies have a temp sensor that may not let the OD engage if it is too cold for the fluid to warm up sufficiently.
Quote;
This post is intended to address the most recent concerns regarding the 46RE. One of the biggest problems encountered is an unknowlegable person trying to diagnose various issues on the 46RE. More often that not shift problems are related to relatively easy items to repair.
First, understand that the 46RE is an electronically controlled, hydraulically actuated transmission.
There are a number of things that can affect a no 3-4 shift:
*Assuming that the OD Switch on the stalk is off, the switch could be defected causing the OD circuit to be defeatured. This does happen!
*Overdrive circuit fuse is open.
*The overdrive switch circuit either open or shorted. Check the connectors at the transmission for corroded terminals. This is very common on older RAMs.
*Incorrect outputs from the Distance or Coolant Sensors. A punky Distance Sensor can caused a weird collection of symptoms, including no 3-4 shift. Also, remember that the 46RE will not shift in to fourth gear until the transmission fluid reaches a certain temperature. If the coolant temperature sensor is bad you will not get a 3-4 shift. If this problem is recent to the winter weather, this should be a prime suspect.
*Incorrect output or intermittent output from the Throttle Position Sensor. On Dodge trucks the Throttle Position Sensor can cause all kinds of problems. Maybe even global warming!
*The Neutral Sense circuit to the PCM is open or shorted.
*The Overdrive Solenoid either shorted, open, or weak. On older 46REs the solenoid plungers became partially magnetized over time causing inoperation.
*The Overdrive Solenoid feed orfice is clogged in the valve body. A very common problem on vehicles that DID NOT receive a reqular transmission filter and fluid maintence.
*Low hydraulic pressure. This can be caused by a number of things, too. But before you suspect the pump I'll bet that the Anti-Drain Back valve in the transmission line is clogged. Some shops clean them, but I would recommend replacing it and changing out the fluid.
*Failed Overdrive Clutch. Unfortunately, this is somewhat common in earlier years, especially vehicles that towed heavy loads or were used in hilly country with the vehilce in overdrive.
*Failure of the Overdrive Piston Seal. Usually not a problem unless very high mileage or Dexron-Mercon fluid was used.
*Clogged Overdrive Check Valve. The result of dirty transmission fluid.
*If this transmission has been "overhauled" or "rebuilt" by an independent and they DID NOT use a Mopar transmission overhaul kit, it is very possible that Overdrive Piston has the incorrect spacer installed.
*PCM failure (the least likely).
Hope this helps.
Regards,
Dusty
End Quote!
I dunno who Dusty is but he gave me LOTS of things to look at. Hope the info can help you too!
Quote;
This post is intended to address the most recent concerns regarding the 46RE. One of the biggest problems encountered is an unknowlegable person trying to diagnose various issues on the 46RE. More often that not shift problems are related to relatively easy items to repair.
First, understand that the 46RE is an electronically controlled, hydraulically actuated transmission.
There are a number of things that can affect a no 3-4 shift:
*Assuming that the OD Switch on the stalk is off, the switch could be defected causing the OD circuit to be defeatured. This does happen!
*Overdrive circuit fuse is open.
*The overdrive switch circuit either open or shorted. Check the connectors at the transmission for corroded terminals. This is very common on older RAMs.
*Incorrect outputs from the Distance or Coolant Sensors. A punky Distance Sensor can caused a weird collection of symptoms, including no 3-4 shift. Also, remember that the 46RE will not shift in to fourth gear until the transmission fluid reaches a certain temperature. If the coolant temperature sensor is bad you will not get a 3-4 shift. If this problem is recent to the winter weather, this should be a prime suspect.
*Incorrect output or intermittent output from the Throttle Position Sensor. On Dodge trucks the Throttle Position Sensor can cause all kinds of problems. Maybe even global warming!
*The Neutral Sense circuit to the PCM is open or shorted.
*The Overdrive Solenoid either shorted, open, or weak. On older 46REs the solenoid plungers became partially magnetized over time causing inoperation.
*The Overdrive Solenoid feed orfice is clogged in the valve body. A very common problem on vehicles that DID NOT receive a reqular transmission filter and fluid maintence.
*Low hydraulic pressure. This can be caused by a number of things, too. But before you suspect the pump I'll bet that the Anti-Drain Back valve in the transmission line is clogged. Some shops clean them, but I would recommend replacing it and changing out the fluid.
*Failed Overdrive Clutch. Unfortunately, this is somewhat common in earlier years, especially vehicles that towed heavy loads or were used in hilly country with the vehilce in overdrive.
*Failure of the Overdrive Piston Seal. Usually not a problem unless very high mileage or Dexron-Mercon fluid was used.
*Clogged Overdrive Check Valve. The result of dirty transmission fluid.
*If this transmission has been "overhauled" or "rebuilt" by an independent and they DID NOT use a Mopar transmission overhaul kit, it is very possible that Overdrive Piston has the incorrect spacer installed.
*PCM failure (the least likely).
Hope this helps.
Regards,
Dusty
End Quote!
I dunno who Dusty is but he gave me LOTS of things to look at. Hope the info can help you too!
Administrator
Joined: Apr 2010
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From: Clayton MI
Bear in mind, yours is a 95, therefore, 47RH. Only electronics in yours are the overdrive solenoid, and TCC solenoid. If you have a temp sensor on the trans, it will be on the cooler line back where it exits the trans.
Are you getting any codes? If the PCM commands O/D, and/or TCC lockup, and doesn't see an RPM drop, it should set one, and turn on the CEL. You don't just have overdrive turned off do you? (if the O/D Off light is on, it won't go into overdrive.)
Are you getting any codes? If the PCM commands O/D, and/or TCC lockup, and doesn't see an RPM drop, it should set one, and turn on the CEL. You don't just have overdrive turned off do you? (if the O/D Off light is on, it won't go into overdrive.)
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It turned out to be my ignition switch wires, replaced the pigtail to it and fixed the problem! Thanks guys.
