LB7: Range Shift Inhibited & P0871 Transmission Fluid Pressure Sen - Diesel Place : Chevrolet and GMC Diesel Truck Forums
 
Home Forum Market Place Garage Tuning Library DTC Tool Register Vendors
Go Back   Diesel Place : Chevrolet and GMC Diesel Truck Forums > GM Transmissions > Allison OEM
Register FAQ Forum Rules My Replies My Threads Mark Forums Read Advertise

Allison OEM Discuss repairing & maintaining an OEM Allison automatic transmission.

DieselPlace.com is the premier Duramax Diesel Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools
Old 02-01-2016, 01:39 PM   #1 (permalink)
muffintopman
Low Boost
 
muffintopman's Avatar
 
Join Date: Feb 2016
Posts: 6
iTrader Score: 0 reviews

Range Shift Inhibited & P0871 Transmission Fluid Pressure Sen

My truck recently started to give me the message Range Shift Inhibited and the code P0871 Transmission Fluid Pressure Sensor/Switch ďCĒ Circuit Range/Performance but the cold doesnít always show up. The message will only show if I donít let the truck warm up (normally 15 min) but if I try to cut that down to 5-10 min that is when it shows the message (the temp outside is between 10-30 F). I was reading that the Range shift.. is from the NSBU but I canít find much on the p0871 I donít want to just go spend $90 on a new switch if thatís not the problem. just change trans fluid and spin on filter.

Truck has 122000 on it.

Any help would be much appreciated. Thank You

__________________
2003 Silverado HD 2500 4X4
8 Inch Fabtec lift, Dual Fox shocks, 35inch All-Terrain T/A KO2, Rhino Bed Liner, AMP Research PowerStep Running Boards, CST Dual Shock Upper Control Arms
Offline  
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 02-02-2016, 11:23 AM   #2 (permalink)
Ramblinrodney
Diesel Veteran
 
Ramblinrodney's Avatar
 
Join Date: Sep 2006
Location: Midland, MI
Posts: 5,230
iTrader Score: 0 reviews

Michigan Oil Burners Member

Searching found this. Might have something in it to help.
DTC P0871
Circuit Description
The pressure switch manifold (PSM) is a multiple-switch assembly made up of three normally open (N/O) and one normally closed (N/C) pressure switches. The E pressure switch monitors E shift valve positioning and relays it to the transmission control module (TCM). When E pressure switch is in the open state, E shift valve should be in the unstroked position.
If you search there are a lot of tips on using this.
http://www.sonnax.com/parts/2118-bore-sizing-tool

DTC P0871 is a type A DTC.

DTC Descriptor
This diagnostic procedure supports the following DTC:

DTC P0871 Pressure Switch Solenoid E Circuit Stuck Open

Conditions for Running the DTC
• The components are powered and ignition voltage is greater than 9.0 volts and less than 18 volts.

• Engine speed is greater than 200 RPM and less than 7,500 RPM for 5 seconds.

• E shift valve is commanded to the ON, stroked, position.

Conditions for Setting the DTC
DTC P0871 sets when E solenoid is commanded ON and pressure switch E status remains OFF for 5 seconds, depending on fluid temperature.

Action Taken When the DTC Sets
• The TCM illuminates the malfunction indicator lamp (MIL).

• When in a forward range and shifting is completed, the transmission will fail to another forward range, unless the transmission is compromised by over speeding or direction change, then the transmission will shift to NEUTRAL.

• When in a forward range and the shift is in process, the transmission will return to a previous range, except for 1-2 shifts and 2-1 shifts where the shifts will be completed.

• When in NEUTRAL or REVERSE, the transmission will fail to NEUTRAL.

• While diagnostic response is active, the shift selector is moved from a forward range to NEUTRAL or from a forward range to REVERSE, then the transmission will shift to NEUTRAL.

• DTC P0871 will be stored in TCM history.

• The TCM freezes shift adapts.

• The TCM inhibits torque converter clutch (TCC) engagement.

Conditions for Clearing the DTC
A scan tool can clear the code from TCM history. The TCM automatically clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without failure.

Diagnostic Aids
• Inspect the wiring for poor electrical connections at the TCM. Inspect for the following conditions:

- A bent terminal

- A backed-out terminal

- A damaged terminal

- Poor terminal tension

- A chafed wire

- A broken wire inside the insulation

• When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.

• You may have to drive the vehicle in order to experience a condition.

• This DTC may indicate that E solenoid is mechanically defective.

• When a P0871 and P0873 are set in combination, this may indicate an open circuit condition is present at the pressure switch circuit or the shift valve is stuck in the unstroked position.

Test Description
The numbers below refer to the step numbers on the diagnostic table.

This step tests the TCM response function.

This step tests the transmission wiring harness integrity.

This step tests and evaluates the internal wiring harness.

This step tests the PSM for a failed condition.

Step
Action
Value
Yes
No

Schematic Reference: Automatic Transmission Controls Schematics

1
Did you perform the Diagnostic System Check - Vehicle?
--
Go to Step 2
Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2
Measure the transmission fluid level. Refer to Transmission Fluid Checking Procedure .

Is the transmission fluid level correct?
--
Go to Step 3
Go to Transmission Fluid Checking Procedure

3
Measure line pressure. Refer to Line Pressure Check Procedure .

Is the pressure within the specified value?
--
Go to Step 4
Go to Symptoms - Automatic Transmission

4
Install the scan tool.
Turn ON the ignition, with the engine OFF.
Important: Before clearing the DTC, use the scan tool in order to record the Freeze Frame and Failure Records for reference. The Clear Info function will erase the data.


Record the DTC Freeze Frame and Failure Records.
Clear the DTC.
Start the engine.
Using the scan tool, monitor TFP SW. E status.
Does the scan tool indicate TFP SW. E status is ON?
--
Go to Diagnostic Aids
Go to Step 5

5
Turn the ignition OFF.
Disconnect C2 connector (RED) at the TCM.
Install the J 39700 breakout box and the J 43799 breakout box adapter at C2 connector.
Connect terminal 3 to a known good ground.
Turn ON the ignition, with the engine OFF.
Does the scan tool indicate TFP SW. E status is ON when grounded and OFF when open?
--
Go to Step 6
Go to Step 15

6
Turn the ignition OFF.
Connect the C2 connector (RED) to the TCM.
Disconnect the transmission 20-way connector.
Turn the ignition ON. Additional DTCs might be set.
Connect terminal E to a known good ground.
Does the scan tool indicate TFP SW. E status is ON when grounded and OFF when open?
--
Go to Step 7
Go to Step 14

7
Connect the transmission 20-way connector.
Remove the oil pan. Refer to Oil Pan Replacement .
Disconnect the AT internal wiring harness from the PSM and ground terminal C.
Does the scan tool indicate TFP SW. E status is ON when grounded and OFF when open?
--
Go to Step 8
Go to Step 13

8
Remove the PSM from the control valve body and leave the internal harness connected. Refer to Pressure Switch Manifold Replacement .
Provide a ground connection for the PSM to either the control valve body or the transmission main case.
Using the eraser end of a pencil, push gently on the pressure switch E membrane.
Does the scan tool indicate TFP SW. E status is ON when grounded and OFF when open?
--
Go to Step 9
Go to Step 12

9
Remove the control valve body and inspect for a stuck or sticking E shift valve. Refer to Control Valve Body Disassemble .

Was the E shift valve stuck or sticking?
--
Go to Step 11
Go to Step 10

10
Replace the E shift solenoid and install the control valve body. Refer to Control Valve Body Replacement .

Did you complete the replacement and install the valve body?
--
Go to Step 16
--

11
Clean and/or polish the sticking valve to restore free movement or replace the control valve body assembly. Refer to Control Valve Body Cleaning and Inspection .

Did you restore free movement or replace the valve body?
--
Go to Step 16
--

12
Replace the PSM. Refer to Pressure Switch Manifold Replacement .

Did you complete the replacement?
--
Go to Step 16
--

13
Replace the AT internal wiring harness. Refer to Wiring Harness Replacement .

Did you complete the replacement?
--
Go to Step 16
--

14
Repair the engine wiring harness circuit for an open or short. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?
--
Go to Step 16
--

15
Important: In most cases, the TCM is not at fault. Investigate thoroughly before replacing the TCM.


Replace the TCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?
--
Go to Step 16

16
Perform the following procedure in order to verify the repair:

Clear the DTC.
Start the engine.
Using the scan tool, monitor TFP SW. E status.
Select Specific DTC.
Enter DTC P0871.
Has the test run and passed?

__________________
07 Chevy Classic 2500HD 4x4 2LT LBZ CC/SB White
Nasta Nerf Bars, Line-x, Rancho RS9000XL Shocks, Firestone air bags, Fold-a-cover,
Good/Year Wrangler S/A 265/75/16 E
Transgo Jr. PCV Reroute kit, Trans Line Repair Kit By Dirty Hooker Diesel,
Custom Perf/Tow Tune by Kennedy
2019 Arctic Fox 27-5L 10,500 dry weight
UAW Local 699 Retired Test Technician

Last edited by Ramblinrodney; 02-02-2016 at 11:34 AM.
Offline   Reply With Quote Quick reply to this message
Old 02-02-2016, 11:36 AM   #3 (permalink)
Ramblinrodney
Diesel Veteran
 
Ramblinrodney's Avatar
 
Join Date: Sep 2006
Location: Midland, MI
Posts: 5,230
iTrader Score: 0 reviews

Michigan Oil Burners Member

Document ID# 1492371
2005 Chevrolet Chevy K Silverado - 4WD


--------------------------------------------------------------------------------

DTC P0871
Circuit Description
The pressure switch manifold (PSM) is a multiple-switch assembly made up of three normally open (N/O) and one normally closed (N/C) pressure switches. The E pressure switch monitors E shift valve positioning and relays it to the transmission control module (TCM). When E pressure switch is in the open state, E shift valve should be in the unstroked position.

DTC P0871 is a type A DTC.

DTC Descriptor
This diagnostic procedure supports the following DTC:

DTC P0871 Pressure Switch Solenoid E Circuit Stuck Open

Conditions for Running the DTC
• The components are powered and ignition voltage is greater than 9.0 volts and less than 18 volts.

• Engine speed is greater than 200 RPM and less than 7,500 RPM for 5 seconds.

• E shift valve is commanded to the ON, stroked, position.

Conditions for Setting the DTC
DTC P0871 sets when E solenoid is commanded ON and pressure switch E status remains OFF for 5 seconds, depending on fluid temperature.

Action Taken When the DTC Sets
• The TCM illuminates the malfunction indicator lamp (MIL).

• When in a forward range and shifting is completed, the transmission will fail to another forward range, unless the transmission is compromised by over speeding or direction change, then the transmission will shift to NEUTRAL.

• When in a forward range and the shift is in process, the transmission will return to a previous range, except for 1-2 shifts and 2-1 shifts where the shifts will be completed.

• When in NEUTRAL or REVERSE, the transmission will fail to NEUTRAL.

• While diagnostic response is active, the shift selector is moved from a forward range to NEUTRAL or from a forward range to REVERSE, then the transmission will shift to NEUTRAL.

• DTC P0871 will be stored in TCM history.

• The TCM freezes shift adapts.

• The TCM inhibits torque converter clutch (TCC) engagement.

Conditions for Clearing the DTC
A scan tool can clear the code from TCM history. The TCM automatically clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without failure.

Diagnostic Aids
• Inspect the wiring for poor electrical connections at the TCM. Inspect for the following conditions:

- A bent terminal

- A backed-out terminal

- A damaged terminal

- Poor terminal tension

- A chafed wire

- A broken wire inside the insulation

• When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.

• You may have to drive the vehicle in order to experience a condition.

• This DTC may indicate that E solenoid is mechanically defective.

• When a P0871 and P0873 are set in combination, this may indicate an open circuit condition is present at the pressure switch circuit or the shift valve is stuck in the unstroked position.

Test Description
The numbers below refer to the step numbers on the diagnostic table.

This step tests the TCM response function.

This step tests the transmission wiring harness integrity.

This step tests and evaluates the internal wiring harness.

This step tests the PSM for a failed condition.

Step
Action
Value
Yes
No

Schematic Reference: Automatic Transmission Controls Schematics

1
Did you perform the Diagnostic System Check - Vehicle?
--
Go to Step 2
Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2
Measure the transmission fluid level. Refer to Transmission Fluid Checking Procedure .

Is the transmission fluid level correct?
--
Go to Step 3
Go to Transmission Fluid Checking Procedure

3
Measure line pressure. Refer to Line Pressure Check Procedure .

Is the pressure within the specified value?
--
Go to Step 4
Go to Symptoms - Automatic Transmission

4
Install the scan tool.
Turn ON the ignition, with the engine OFF.
Important: Before clearing the DTC, use the scan tool in order to record the Freeze Frame and Failure Records for reference. The Clear Info function will erase the data.


Record the DTC Freeze Frame and Failure Records.
Clear the DTC.
Start the engine.
Using the scan tool, monitor TFP SW. E status.
Does the scan tool indicate TFP SW. E status is ON?
--
Go to Diagnostic Aids
Go to Step 5

5
Turn the ignition OFF.
Disconnect C2 connector (RED) at the TCM.
Install the J 39700 breakout box and the J 43799 breakout box adapter at C2 connector.
Connect terminal 3 to a known good ground.
Turn ON the ignition, with the engine OFF.
Does the scan tool indicate TFP SW. E status is ON when grounded and OFF when open?
--
Go to Step 6
Go to Step 15

6
Turn the ignition OFF.
Connect the C2 connector (RED) to the TCM.
Disconnect the transmission 20-way connector.
Turn the ignition ON. Additional DTCs might be set.
Connect terminal E to a known good ground.
Does the scan tool indicate TFP SW. E status is ON when grounded and OFF when open?
--
Go to Step 7
Go to Step 14

7
Connect the transmission 20-way connector.
Remove the oil pan. Refer to Oil Pan Replacement .
Disconnect the AT internal wiring harness from the PSM and ground terminal C.
Does the scan tool indicate TFP SW. E status is ON when grounded and OFF when open?
--
Go to Step 8
Go to Step 13

8
Remove the PSM from the control valve body and leave the internal harness connected. Refer to Pressure Switch Manifold Replacement .
Provide a ground connection for the PSM to either the control valve body or the transmission main case.
Using the eraser end of a pencil, push gently on the pressure switch E membrane.
Does the scan tool indicate TFP SW. E status is ON when grounded and OFF when open?
--
Go to Step 9
Go to Step 12

9
Remove the control valve body and inspect for a stuck or sticking E shift valve. Refer to Control Valve Body Disassemble .

Was the E shift valve stuck or sticking?
--
Go to Step 11
Go to Step 10

10
Replace the E shift solenoid and install the control valve body. Refer to Control Valve Body Replacement .

Did you complete the replacement and install the valve body?
--
Go to Step 16
--

11
Clean and/or polish the sticking valve to restore free movement or replace the control valve body assembly. Refer to Control Valve Body Cleaning and Inspection .

Did you restore free movement or replace the valve body?
--
Go to Step 16
--

12
Replace the PSM. Refer to Pressure Switch Manifold Replacement .

Did you complete the replacement?
--
Go to Step 16
--

13
Replace the AT internal wiring harness. Refer to Wiring Harness Replacement .

Did you complete the replacement?
--
Go to Step 16
--

14
Repair the engine wiring harness circuit for an open or short. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?
--
Go to Step 16
--

15
Important: In most cases, the TCM is not at fault. Investigate thoroughly before replacing the TCM.


Replace the TCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?
--
Go to Step 16

16
Perform the following procedure in order to verify the repair:

Clear the DTC.
Start the engine.
Using the scan tool, monitor TFP SW. E status.
Select Specific DTC.
Enter DTC P0871.
Has the test run and passed?
--
System OK
Go to Step 1
__________________
07 Chevy Classic 2500HD 4x4 2LT LBZ CC/SB White
Nasta Nerf Bars, Line-x, Rancho RS9000XL Shocks, Firestone air bags, Fold-a-cover,
Good/Year Wrangler S/A 265/75/16 E
Transgo Jr. PCV Reroute kit, Trans Line Repair Kit By Dirty Hooker Diesel,
Custom Perf/Tow Tune by Kennedy
2019 Arctic Fox 27-5L 10,500 dry weight
UAW Local 699 Retired Test Technician

Last edited by Diaric; 02-02-2016 at 08:08 PM.
Offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 02-02-2016, 06:57 PM   #4 (permalink)
muffintopman
Low Boost
 
muffintopman's Avatar
 
Join Date: Feb 2016
Posts: 6
iTrader Score: 0 reviews

Thank You I will start to trouble shoot
__________________
2003 Silverado HD 2500 4X4
8 Inch Fabtec lift, Dual Fox shocks, 35inch All-Terrain T/A KO2, Rhino Bed Liner, AMP Research PowerStep Running Boards, CST Dual Shock Upper Control Arms
Offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Diesel Place : Chevrolet and GMC Diesel Truck Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

PLEASE READ! You must check your email inbox for the confirmation link to complete registration. Please check your spam box if you do not see the email in your inbox.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Insurance
Please select your insurance company (Optional)

Log-in


Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
No boost, no smoke, no codes whitedog Medium Duty Trucks 8 01-25-2016 06:00 PM
LB7: Heavy Thump/Click when I let off the throttle! Reel Aggressive Duramax First Generation: 2001-2004 (LB7) 6 12-31-2015 10:34 AM
EFI live tune and tow/haul mode frysl EFILive Tuning Software 28 12-10-2015 07:28 PM
Allison Transmission Fluid Change: Hoot method questions Birdhunter Maintenance & Fluids 14 11-03-2015 11:42 PM
GM 4L80E/4L60E Reference Material, Manuals, FAQ's/Parts List. (Updated November 2018) knkreb 4L80/85E Transmissions. 6L90 Transmission 1 04-12-2015 06:42 PM


All times are GMT -4. The time now is 06:21 PM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Shoutbox provided by vBShout v6.2.1 (Lite) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd. Runs best on HiVelocity Hosting.
© AutoGuide