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New member-4L80E problems

Rav

New Member
Messages
6
Likes
1
Location
Mississippi
Thread starter #1
I have a 2005 2500hd with transmission problems. It stopped pulling and showed P1810 code, so I replaced the tranmission fluid pressure switch and put new fluid in. It ran fine for maybe 30 miles then wouldn't pull again. If it sits for a day I can crank it and it will spin the tires, but after maybe a minute it stops pulling and has no power. If it sits again it will do the same thing. Does it in all gears and reverse. Help please.
 

Will L.

Well-Known Member
Messages
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6,586
Location
Boulder City Nv
#2
Maybe replacing the bad unit a loose electrical connection issue at the plug. Not a common issue, just possible.

Trying to remember but o ring damge on install possible?

Possible pinched, cut harness.

What brand part did you install?
 

Rav

New Member
Messages
6
Likes
1
Location
Mississippi
Thread starter #3
I Installed Standard Motor Products M14003 Transmission Pressure Switch Assembly. I checked all the plugs yesterday and still had the same issues. Before I installed the plug I had the same issues. The only thing we did was unplug the old pressure switch and put the new one in and put some fresh transmission fluid I. It and it ran like a champ for a day or so.
 

Rav

New Member
Messages
6
Likes
1
Location
Mississippi
Thread starter #5
Good afternoon, I do not have transmission pressure gauge. If I buy one and find the pressure is low what would that indicate? The only code I am seeing is a knock sensor.
 

Rav

New Member
Messages
6
Likes
1
Location
Mississippi
Thread starter #8
Any ideas on why it worked fine for a while after I put in the new pressure switch and new fluid? Then starting doing the same thing? Hate to redo tranmission and that is not the problem...
 

THEFERMANATOR

FRANKENBURBAN
Staff member
Lead Moderator
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Location
ZEPHYRHILLS FL
Staff #9
The p1810 is a code that doesn't always limp immidiately. From what I found, it takes 2 drive cycles for it to go into protection mode C for that code.
 

Rav

New Member
Messages
6
Likes
1
Location
Mississippi
Thread starter #10
I ordered the pressure gauge today. Can you tell me what pressure I am looking for? And is then when it is idle I test it or when? Thanks for all the help so far.
 
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Location
alaska
#12
Install 400 p.s.i gauge to pressure tap drivers side of unit. Check that oil is full and warm transmission up to operating temperatures. Warning: apply parking brake and foot brake during entire test!! With engine running shift transmission into drive with foot on the brake, at idle in drive, park and neutral the main pressure should be approximately 40-70 psi and with throttle depressed to floor should be approximately 160-180 p.s.i. only hold at full throttle 2 seconds or transmission damage may result! Reverse pressure should be approx. 60-70 p.s.i. at idle and approximately 300-330 psi full throttle. Again only 2 seconds! DO not repeatedly “brake stand the transmission” it will overheat quickly and do damage. You can have observer watch gauge in passengers seat while driving and should vary pressure with throttle smoothly. Do not drive and watch gauge at same time!!

What I found by googling
 
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