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Need some thoughts on P0751 Well CRAP more going on in this one. P0756 now
Coming home from Seattle today I got a flashing tow/haul
light and a after a stop it cleared and then set a CEL. I was
able to check it with the SGII and each time it was just the P0751.
It did come up when coasting down a hill after the reset.
I got home and removed the 8K Tow tune and went for a test
drive. Coasting down a hill and using engine breaking it came back.
I have not scanned with the IDS yet battery on the laptop was
low on power. I will check in the AM.
I got this same code P0751- shift solenoid a performance stuck off
From reading what Creator said it looks to be the
SSPC-A Solenoid with a part number of 3C3Z-7J136-AA (I need to verify for my truck).
I will pick up a pressure test set to check system pressure.
Fluid was dump and fill this last spring with a new filter.
The level was between the hash marks on the hot side
Temp was at normal operation level and the fluid was clean,bright
and no funny/burnt smells. Truck seems to move ok. Maybe a little
hesitation from Reverse to Forward. (Not really sure on that)
Sorry I really don't know. Anybody heard from Mark lately? A little surprised he hasn't popped up haveing transmisson questions around. Maybe his dinger is broke.
Trouble Code: P0751
1-2 Shift Solenoid Valve Performance - No First or Fourth Gear
Possible Causes:
If you clear DTC P0751, and then cannot set DTC P0751 again, inspect for the following conditions:
Fluid contamination
Plugged fluid circuits
Restricted fluid circuits
Pump not supplying enough pressure
PC-A problem
Refer to Shift Solenoid Valve State and Gear Ratio .It is possible for an internal TCM failure which may not allow sufficient current to operate the solenoids. Verify TCM functionality by commanding the suspected solenoid ON/OFF using the scan tool and listen for a click.
"P0751 means one of the solenoids (solenoid A) is mechanically stuck. Chaffed or damaged wires will NOT cause this code. The only way this code can set is if the armature inside the solenoid is physically stuck.".
"P0751 means one of the solenoids (solenoid A) is mechanically stuck. Chaffed or damaged wires will NOT cause this code. The only way this code can set is if the armature inside the solenoid is physically stuck.". __
This sounds like a "simple" solenoid replacement.
Is it easily accessible by simply removing the pan?
Is it easily accessible by simply removing the pan?
If it is, it should be an easy "fix"
It could be a simple solenoid replacement, but if you look at the threads that are on the forums, it isn't always. One guy just replaced the solenoid and that didn't cure anything. Cr38tor's issue eventually turned out to be a pump issue (he sated that it could also be a PC-A problem). Hopefully some expert help can come along to help narrow down the possibilities (for folks that don't have access to tools that can command these solenoids). The pressure testing might just point to the proper solution.
Very interesting to say the least.
I had to take one of the cats to the vet. No flashing light. But I did not use
tow/haul when going down hills. I did feel some hesitation when going from
R to D. Just a little. On the way to the vet I was paging through the SGII
data and found that I no longer had the TFT one set. I called Maxium4x4
and he sent me the codes. Odd thing was it would not read anything for that
code set. So I checked my entries and made sure that I had this in it.
Transmission Fluid Temperature C410F1221674 046205160674 3010 000100080000 TFT Degrees Fahrenheit
Even after reloading it No Love.
So I plugged the IDS in it saw the TFT just fine but because I had reset the computer
yesterday and did not run in T/H today there were not any codes. I did find
some com error codes and thinking that maybe I should clear the KAM and start
from scratch.
Tomorrow I plan on having a pressure gauge so I can test the pressures. I wished
I had a remote reading digital one so I could watch it and see what going on.
The big question is do I get the last 3C3Z-7J136-AA in town and have
it on hand or what ???
Very interesting to say the least.
I had to take one of the cats to the vet. No flashing light. But I did not use
tow/haul when going down hills. I did feel some hesitation when going from
R to D. Just a little. On the way to the vet I was paging through the SGII
data and found that I no longer had the TFT one set. I called Maxium4x4
and he sent me the codes. Odd thing was it would not read anything for that
code set. So I checked my entries and made sure that I had this in it.
Transmission Fluid Temperature C410F1221674 046205160674 3010 000100080000 TFT Degrees Fahrenheit
Even after reloading it No Love.
So I plugged the IDS in it saw the TFT just fine but because I had reset the computer
yesterday and did not run in T/H today there were not any codes. I did find
some com error codes and thinking that maybe I should clear the KAM and start
from scratch.
Tomorrow I plan on having a pressure gauge so I can test the pressures. I wished
I had a remote reading digital one so I could watch it and see what going on.
The big question is do I get the last 3C3Z-7J136-AA in town and have
it on hand or what ???
It could be a simple solenoid replacement, but if you look at the threads that are on the forums, it isn't always. One guy just replaced the solenoid and that didn't cure anything. Creator's issue eventually turned out to be a pump issue. Hopefully some expert help can come along to help narrow down the possibilities (for folks that don't have access to tools that can command these solenoids). The pressure testing might just point to the proper solution.
Well, this might have answered my question.
Mark posted the following on another board in 2012:
P0751 means one of the solenoids (solenoid A) is mechanically stuck. Chaffed or damaged wires will NOT cause this code. The only way this code can set is if the armature inside the solenoid is physically stuck.
I don't have a diagram to share with you showing which of the seven solenoids is Solenoid A. They are easy to change once the pan is off.
Don't worry about P0700. That's a code that sets when something is wrong, but the PCM can't determine what it is. Most likely if you replace solenoid A that code won't come back.
__________________ Mark Former Automatic Transmission Engineer 1988-2007
If those solenoids are not prohibitively expensive, and evidently are not all that hard to replace, it might be an easy fix.
I had a flashing Tow/Haul light last summer briefly towing my 5000lb boat south up the hill going through the Siskiyous I-5 to Lake Shasta. It happened only once and unfortunately, I didn't have a way to ID the DTC. By the time I got back, it was too late to check the codes I guess. I suppose they're not saved after so many cycles.
I wasn't monitoring TFT at the time so I don't know what it was, but it wasn't all that hard a pull so I don't suspect it was hot.
A code p0751 should only set because of a mechanically stuck solenoid. The solenoid is not hard to change once the pan is off. I used to have a diagram showing which solenoid is which, but I can't find it.
Originally Posted by HT32BSX115
By the time I got back, it was too late to check the codes I guess. I suppose they're not saved after so many cycles.
It took you more than a month to get back? That's about how long codes will stay in memory after the last time the light flashed.
I think if your tearing the tranny apart, it's worth having the correct manual and tools to do the job. I've got one waiting for the day I may need it.
There is also a pic of the solenoids in the PSN link I provided in post #3 (that is where the OP replaced the solenoid and still had the code when he turned on the tow/haul)
12-23-2014, 02:13 AM
Automatic Transmission Engineer 1988-2007
