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Unread 08-20-2014, 08:50 PM   #1
94jeepman
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po700 and p0841

hey guys im getting these two codes when I hooke the obd2 reader to it the p0700 transmission control system (malfunction indicator light request) and p0841 LR pressure switch rationality. and it also goes into 3rd gear when I put it in drive. the jeep does not move at all in any gears. did some research on the p0841 sounds seems like it can be multiple things. any help would be nice right now.

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Unread 08-20-2014, 08:56 PM   #2
94jeepman
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from the research I did and what I can understand the vehicles that can still move are usually filter problems causing lack of pressure.
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Unread 08-21-2014, 09:00 AM   #3
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from the 2005 WK factory service manual-

P0841-LR PRESSURE SWITCH RATIONALITY

•When Monitored:
Continuously with the ignition on and engine running.

•Set Condition:
The DTC will set if the LR Pressure Switch reads open or closed at the wrong time in a given gear.

Possible Causes

LOSS OF PRIME AND/OR TRANSMISSION CONTROL RELAY DTC PRESENT
LOW FLUID LEVEL
LOW LINE PRESSURE
REVERSE CARRIER SNAP RING DISLODGED
CRACKED OR MISINSTALLED PRIMARY OIL FILTER OR FILTER SEAL
STICKING MAIN REGULATOR VALVE IN PUMP VALVE BODY
NO. 1 CHECK BALL CUT OR DAMAGED
WIRING AND CONNECTORS
(T50) LR PRESSURE SWITCH SENSE CIRCUIT OPEN
(T50) LR PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND
(T50) LR PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE
TRANSMISSION SOLENOID/TRS ASSEMBLY
POWERTRAIN CONTROL MODULE
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Unread 08-21-2014, 09:22 AM   #4
Tcolin2351
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Quote:
Originally Posted by 94jeepman View Post
from the research I did and what I can understand the vehicles that can still move are usually filter problems causing lack of pressure.
I had the filter issue, it was cracked. Pretty simple fix
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Unread 08-21-2014, 09:18 PM   #5
94jeepman
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Quote:
Originally Posted by Tcolin2351 View Post
I had the filter issue, it was cracked. Pretty simple fix
what did your jeep do when it was cracked?
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Unread 08-21-2014, 10:07 PM   #6
Tcolin2351
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Quote:
Originally Posted by 94jeepman
what did your jeep do when it was cracked?
Could move shifter from park to drive but would engage in drive or reverse. Like it was in neutral
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Unread 08-22-2014, 04:04 AM   #7
caulk04
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It's in limp mode.

You'll need to either start digging and look for a problem or buy/borrow/steal a better scanner that can pull the trans specific codes to diagnose further.
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Unread 08-23-2014, 06:06 PM   #8
94jeepman
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Quote:
Originally Posted by JeepCares View Post
from the 2005 WK factory service manual-

P0841-LR PRESSURE SWITCH RATIONALITY

•When Monitored:
Continuously with the ignition on and engine running.

•Set Condition:
The DTC will set if the LR Pressure Switch reads open or closed at the wrong time in a given gear.

Possible Causes

LOSS OF PRIME AND/OR TRANSMISSION CONTROL RELAY DTC PRESENT
LOW FLUID LEVEL
LOW LINE PRESSURE
REVERSE CARRIER SNAP RING DISLODGED
CRACKED OR MISINSTALLED PRIMARY OIL FILTER OR FILTER SEAL
STICKING MAIN REGULATOR VALVE IN PUMP VALVE BODY
NO. 1 CHECK BALL CUT OR DAMAGED
WIRING AND CONNECTORS
(T50) LR PRESSURE SWITCH SENSE CIRCUIT OPEN
(T50) LR PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND
(T50) LR PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE
TRANSMISSION SOLENOID/TRS ASSEMBLY
POWERTRAIN CONTROL MODULE
where did you find this info? or do you know what this part means
STICKING MAIN REGULATOR VALVE IN PUMP VALVE BODY
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The WK mods: SC flashpaq 3870, flow master super 40, 3.5" X Factor leveling kit, 33" M/T baja claws, 17" pro comp wheels, one 12 inch subwoofer, rugged ridge tailight gaurds, rola rack with 18" extension
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