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I changed the fluid and spin on filter in my truck and after the truck was started the transmission made a clunk and the service engine soon light came on. Tranny is in limp mode. Reset the codes and restarted the truck and put tranny in drive. After a few seconds transmission popped again and both codes came back. P is Trans pressure switch solenoid D circuit stuck closed P is Trans pressure switch solenoid E stuck closed I replaced the NSBU switch thinking it could be the culprit but after replacing the switch and clearing the codes they came right back as before.

duramax p0872

Any ideas or suggestions will be very much appreciated! The fluid looked a little dirty to me and filter magnet had a good collection of material on it. Time to pull the pan and check wires and filter. Mike, What should I be looking for when I drop the pan besides the electrical connections?

You have not givin much info here. Remember we can't see or know what you know. Was the pan dropped during your service and filter changed?

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Built or stock? How was trans treated? How many miles? Look at connections inside pan. Look for trash at bottm of pan. How much metal on internal magnet at bottom of pan? Finaly, peel the filter apart and unfurl paper element and see if there is trash in there.

Mike, Ok The transmission is stock withmiles and the pan has never been off of it so the internal filter is the original. The truck has mostly been a daily driver but has seen some occasional towing and has had the Diablo Sport Predator towing tune for most of its life.

Fluid and external filter changes as needed. I did find the transmission dipstick tube broken recently so I guess there is a possibility of some contamination going down the tube while it was broken. I removed the tube and tigged it back together and re-installed it the same day I changed the fluid and filter. The filter magnet was pretty much covered with black material. Thanks for the guidance so far and I will drop the pan as soon as I can.View Full Version : Transmission leak. I don't drive my truck very often anymore.

It looks like it came from between the transfer case and where the transmission meet. I checked the fluid before starting it and it looked over filled.

P0877 - Transmission Fluid Pressure Sensor/Switch 'D' Circuit Low

After starting it I haven't noticed any leaking since. But the truck hasn't sat for longer than a day since then. I was wondering if it is a possible converter drain back issue but I don't know where the fluid would be coming from.

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Any ideas? Fluid check on a cold trans will always show overfilled. Not a very accurate way to check it. Your leak could be the adapter gasket, harness connector at back of trans. Pictures would help. Hi Mike, I just cleaned up all the residual oil to see if its leaking at all, so theirs not much to see now.

I was wrong though its not coming from the tcase area, but from the I'm guessing adapter gasket? It almost looked like it was the pan gasket at the rear of the transbut the bolts where tight and it was wet above the pan gasket. I can't see for sure where it might be coming from with the cross member in the way.

It didn't look like it was coming from the harness connector more dead center of the trans, but I didn't get a really good look when it was wet since I was on my way out the door and needed my truck. My builders "secretary" wants me to bring it in, but its kind of a pain to do with my work schedule and them being so far.

And I don't really want to wast his and my time if he can't tell me anything. Does that help narrow it down any? I did fine putting in a Transgo Jr and pump rub kit in my tcase, but I'm not sure how crazy I'm about tearing into the drive train more then that myself.

Its been just over a year and 7K miles since I had the trans built. I noticed a drip, I did not realize mine was so bad. It pours when I fill it with fluid.

I thought it was pump rub but the fluid is all above the trans brace?This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic.

A P code is registered when the powertrain control module PCM is registering transmission fluid pressure that is above or below factory spec. The PCM receives information on transmission fluid pressure from a fluid pressure sensor. The transmission fluid pressure sensor is supplied with a 5-volt reference signal from a voltage wire, and also features a ground wire. The reference voltage wire is used by the PCM to monitor transmission fluid pressure.

Conversely, when fluid pressure drops, sensor resistance is high and reference voltage decreases. The PCM acts accordingly on these readings. If fluid pressure is either lower or higher than factory spec, a code is stored and the malfunction indicator lamp MIL is illuminated. Any diagnosis should start by checking the transmission fluid level and condition. Fill the transmission with the proper type of fluid and check for leaks. Follow up by spraying the area with aerosol foot powder, making it easy to trace the path of a leak.

Transmission fluid that smells or appears burned is a bad sign, usually indicating that the transmission was overheated and run for an extended period at a low fluid level. Catastrophic internal failure may have occurred. If mileage indicates it, consider a transmission rebuild.

Drop the transmission pan and check for the presence of clutch debris or metal shavings, which indicate serious mechanical problems. If the transmission fluid is good and the transmission appears to be in good working order with no overheating, move on to the transmission fluid pressure sensor. Retest the system. If all wiring, connectors and components appear to be in good condition, connect the code reader to the diagnostic port.

Record any stored codes and freeze frame the information. Reference voltage is usually 5 volts, but double check factory spec for the proper sensor reference voltage. Compare your readings to factory spec and replace the sensor if it is not in compliance.

Replace any system circuitry and components as required. Sometimes when this code is stored, a technician may assume only a low fluid condition and a leak, when transmission internals may have sustained damage.

A P code can result in the PCM putting the transmission in limp-in mode, meaning the vehicle will barely be drivable at all.

Often, a P code is an indicator of other problems in the transmission. Automatic transmissions are complex assemblies. Any transmission problems should be taken seriously, as continuing to drive a vehicle with transmission issues can quickly make things much worse. YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at With YourMechanic you can skip the auto shop altogether.

They send certified and screened mechanics straight to your door and enable you to save big on car repair and maintenance.This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. A P trouble code refers to a problem detected by the Powertrain Control Module PCM with the fluid pressure within the transmission.

Some vehicle PCMs place the transmission into Limp-in mode in addition to storing a code and illuminating the Check Engine light. Related trouble codes include a P, P, P, and P code. A P trouble code means that the transmission fluid pressure has exceeded or fallen below limits set by the manufacturer.

A transmission leak causing a low fluid condition is one cause of a P trouble code. Additional causes include a defective high pressure pump, a malfunctioning transmission temperature sensor, an overheating engine, a slipping or malfunctioning transmission, or a faulty PCM.

duramax p0872

Some common symptoms of a P trouble code include the smell of overheated transmission fluid, sometimes accompanied by smoke. In addition to these signs, the transmission might also slip or fail to engage. Once they have the proper tools, the mechanic can then proceed to diagnose the trouble code by taking the following steps:. When diagnosing and repairing a P trouble code, mistakes comonly made by mechanics range from fixing a transmission leak while not realizing the low fluid condition has damaged the transmission internally to rebuilding the transmission when unnecessary just because the transmission overheated.

When a vehicle PCM stores a P trouble code it is important to have the problem diagnoses and fixed as soon as possible to prevent further potential transmission damage.

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at With YourMechanic you can skip the auto shop altogether.

They send certified and screened mechanics straight to your door and enable you to save big on car repair and maintenance. Cost of diagnosing the P code. No more waiting rooms!

duramax p0872

Our mechanics will come to you to diagnose and fix the P code. Recent Check Engine Light is on Inspection reviews. Excellent Rating. Average Rating 4. Number of Reviews 5, Rating Summary. Johnathon 8 years of experience. Request Johnathon. Johnathon was on time and was very knowledgeable.

P0872 OBD-II Trouble Code: Transmission Fluid Pressure Sensor/Switch C Circuit Low

Going to use in future. Travis 12 years of experience. Request Travis. Fair, honest, punctual, and knowledgeable. I was also to get back up and running for less than I thought. I have a new mechanic now to recommend to my friends.

Chris 21 years of experience. Request Chris.View Full Version : Allison 5sp: I'm limped, p So being the nice guy I am, I went and pulled out a buddy of mine today. And about halfway through 30 clay puddles all heck broke loose.

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I had an overboost, security, p, and limp mode all at once. The security, TC lockup, and security went away after a code clear.

Anyways I limped it home and cleared it again, and as soon as she went back into drive she slammed into 3rd and stays there. I DO have reverse. I also have u always have I JUST replaced my extension housing, so there is almost 5 gallons of brand new amsoil my wallet is still crying in the tranny. Is there a writeup somewhere on how to clean out the valve?

P does mean locked solenoid C? If I take it to a tranny shop will they just want to rebuild or replace manifold, valve body, etc Help! Out of curiosity did you replace the tail housing with the Trans in the truck? Absolutely not.

Good man. Or replacing the whole thing? Or just cleaning it?

duramax p0872

I'm 6'4 and lbs, there was no way of physically doing it without a lift lol as far as the E shift valve, do you recommend the stronger spring?

Find out what is making it stick, clean it well, and put a stronger spring in. Stonger spring by itself will not work if there is trash floating around inside.

Thank you very much. As far as the Forum thing, we are both on both forums. Shouldn't be an issue. Except there is no one on the other forum that can help you. Exactly, but other than you and a few others that forum IMO has more active people. No comment. Well it is on my end. There are usually 10 unread threads on here.

And DF is usually an average of According to my AutoGuide and Tapatalk apps. According to my AutoGuide and Tapatalk apps Tell me what kind of high tech you get there.Allison P Hinewbie here.

Please be gentle if any info left out. Got a LB7 with the Allison I have checked the wiring from the TCM to the transmission, all checked out good. Also installed a new white NSBU switch. The internal and external filters were replaced, and new fluid was added about 9 quarts.

It is doing the same thing that it was before all this work was performed, which is starts and idles fine, but when placed in D, after about 3 seconds, shifts violently hard into default 3rd gear and sets p in ECM, P in TCM. Has anyone ever had this problem before? Could I have gotten a bad new valve body? Could it be a pump pressure problem? All is stock, and we goton the odometer. Thanks for ANY and all answers or assistance.

Thank You! Mike L. Stuck E shift valve. That is the middle valve in the upper half of the valve body. Do you think it is possible for the brand new valve body to have the E valve stuck? Just asking, not questioning. I do not have that much experience with valve bodies. New valve body was complete unit, upper and lower halves with PSM and harness attached.

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Originally Posted by scrambler. Originally Posted by Mike L.

P0872 GMC - Pressure Switch Solenoid 'E' Circuit Low/Stuck Closed

If there was any debris in the fluid or if you had dirty hands, or if you over tightened it, yes. This fricken valve will stick if you look at it crosseyed. Had the same issue when I first built my trans. Everything was spotless and torqued and it still stuck. Mike got it fixed up though!Allison P Hinewbie here. Please be gentle if any info left out. Got a LB7 with the Allison I have checked the wiring from the TCM to the transmission, all checked out good.

Also installed a new white NSBU switch. The internal and external filters were replaced, and new fluid was added about 9 quarts. It is doing the same thing that it was before all this work was performed, which is starts and idles fine, but when placed in D, after about 3 seconds, shifts violently hard into default 3rd gear and sets p in ECM, P in TCM.

Has anyone ever had this problem before? Could I have gotten a bad new valve body? Could it be a pump pressure problem? All is stock, and we goton the odometer.

Thanks for ANY and all answers or assistance. Thank You! Mike L. Stuck E shift valve. That is the middle valve in the upper half of the valve body. Do you think it is possible for the brand new valve body to have the E valve stuck? Just asking, not questioning.

I do not have that much experience with valve bodies. New valve body was complete unit, upper and lower halves with PSM and harness attached. Originally Posted by scrambler. Originally Posted by Mike L.

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If there was any debris in the fluid or if you had dirty hands, or if you over tightened it, yes. This fricken valve will stick if you look at it crosseyed. Had the same issue when I first built my trans. Everything was spotless and torqued and it still stuck. Mike got it fixed up though! Thread Tools.

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