Operation CHARM: Car repair manuals for everyone.
Home >> Chevy Truck >> 2009 >> Silverado 3500 2WD V8-6.6L DSL Turbo >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P0757

P0757



DTC P0752, P0757, or P0762

Diagnostic Instructions

* Perform theDiagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* ReviewStrategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.



DTC Descriptors
DTC P0752
- Shift Solenoid (SS) 1 Valve Performance - Stuck On

DTC P0757
- Shift Solenoid (SS) 2 Valve Performance - Stuck On

DTC P0762
- Shift Solenoid (SS) 3 Valve Performance - Stuck On




Diagnostic Fault Information






Typical Scan Tool Data






Circuit/System Description

The pressure switch manifold (PSM) is a multiple switch assembly made up of 3 normally open (N/O) pressure switches and 1 normally closed (N/C) pressure switch. Pressure switch 1 (PS1) monitors shift valve 1 positioning, pressure switch 2 (PS2) monitors shift valve 2 positioning, and pressure switch 3 (PS3) monitors shift valve 3 positioning. The pressure switches communicate the positioning to the transmission control module (TCM). The position of the shift valves 1, 2, and 3 is controlled by 3 normally closed shift solenoids 1, 2, and 3 (SS1, SS2, and SS3). When energized, the shift solenoids direct control main pressure to shift valve 1, 2, or 3, which strokes the shift valve.


Conditions for Running the DTC


P0752
* Engine Running.
* Shift solenoid 1 (SS1) is commanded OFF.



P0757
* Engine Running.
* Shift solenoid 2 (SS2) is commanded OFF.



P0762
* Engine Running.
* Shift solenoid 3 (SS3) is commanded OFF.



Conditions for Setting the DTC


P0752
* Engine Running.
* SS1 is commanded OFF and PS1 remains ON for up to 11 seconds depending on transmission fluid temperature.



P0757
* Engine Running.
* SS2 is commanded OFF and PS2 remains ON for up to 15 seconds depending on transmission fluid temperature.



P0762
* Engine Running.
* SS3 is commanded OFF and PS3 remains ON for up to 15 seconds depending on transmission fluid temperature.



Action Taken When the DTC Sets


P0751
* The TCM requests the engine control module (ECM) to illuminate the malfunction indicator lamp (MIL).
* When in a forward range, the transmission will shift to another forward range, unless the transmission is compromised by overspeeding.
* When 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.
* If the shift selector is moved to forward, the transmission will shift to forward and if the selector is moved to REVERSE, the transmission will shift to REVERSE, unless the transmission is compromised by overspeeding or direction change, then a shift to NEUTRAL is made.
* DTC P0752 is stored in TCM history.
* The TCM freezes shift adapts.
* The TCM inhibits torque converter clutch (TCC) engagement.



P0757
* The TCM requests the ECM to illuminate the MIL.
* When in a forward range and shifting is completed, the transmission will shift to another forward range, unless the transmission is compromised by overspeeding or direction change, then the transmission will shift to NEUTRAL.
* If the shift selector is moved to forward, the transmission will shift to forward and if the selector is moved to REVERSE, the transmission will shift to REVERSE, unless the transmission is compromised by overspeeding or direction change, then a shift to NEUTRAL is made.
* DTC P0757 is stored in TCM history.
* The TCM freezes shift adapts.
* The TCM inhibits TCC engagement.



P0762
* The TCM requests the ECM to illuminate the MIL.
* When in a forward range and shifting is completed, the transmission will shift to another forward range, unless the transmission is compromised by overspeeding 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 which will be completed.
* If the shift selector is moved to forward, the transmission will shift to forward and if the selector is moved to REVERSE, the transmission will shift to REVERSE, unless the transmission is compromised by overspeeding or direction change, then a shift to NEUTRAL is made.
* DTC P0762 is stored in TCM history.
* The TCM freezes shift adapts.
* The TCM inhibits TCC engagement.



Reference Information
Schematic Reference

Automatic Transmission Controls Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

* Transmission General Description (Transmission General Description)
* Transmission Component and System Description (Transmission Component and System Description)
* Electronic Component Description (Electronic Component Description)

Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)
Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information


Circuit/System Verification



Warning

Chock the wheels to prevent the vehicle from moving. Failure to chock the wheels can cause personal injury when the electrical system is repaired.

1. Engine running, command the transmission through the forward ranges with a scan tool. Compare the TFP Switch 1, TFP Switch 2, and TFP Switch 3 parameters in each forward range with the PSM Logic table. Refer to Pressure Switch Manifold (PSM) Logic (Pressure Switch Manifold (PSM) Logic) .
2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.



Circuit/System Testing



Note

You must perform the Circuit/System Testing first.

1. Ignition ON, engine OFF, verify with a scan tool the TFP Switch 1, TFP Switch 2, and TFP Switch 3 parameters are High.

• If TFP Switch 1, TFP Switch 2, and TFP Switch 3 parameters are the specified value, refer toControl Valve Body Assembly Disassemble (Overhaul) andControl Valve Body Cleaning and Inspection (Overhaul) . If valve body inspection is normal, replace the shift solenoid indicated by the DTC, refer toControl Valve Solenoid Replacement (SS1, SS2, SS3, TCC, and MAIN MOD) (Control Valve Solenoid Replacement (SS1, SS2, SS3, TCC, and MAIN MOD))Control Valve Solenoid Replacement (PCS1 and PCS2) (Control Valve Solenoid Replacement (PCS1 and PCS2)) .

2. Ignition OFF, disconnect the X175 harness connector at the transmission.
3. Ignition ON, engine OFF, verify with a scan tool the TFP Switch 1, TFP Switch 2, and TFP Switch 3 parameters are High.

• If not the specified value, test the affected pressure switch signal circuit for a short to ground. If circuits tests normal, replace the TCM.

4. Remove the transmission oil pan. Refer to Oil Pan Replacement (Service and Repair) .
5. Test the transmission internal Pressure Switch 1, 2, and 3 signal circuits for a short to ground.

• If the circuits test normal, replace the PSM. Refer to Pressure Switch Manifold Replacement (Service and Repair) .




Repair Instructions

Perform theDiagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Pressure Switch Manifold Replacement (Service and Repair)
* Control Valve Solenoid Replacement (SS1, SS2, SS3, TCC, and MAIN MOD) (Control Valve Solenoid Replacement (SS1, SS2, SS3, TCC, and MAIN MOD))Control Valve Solenoid Replacement (PCS1 and PCS2) (Control Valve Solenoid Replacement (PCS1 and PCS2))
* Wiring Harness Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for TCM replacement, setup, and programming



Repair Verification

If another DTC is present, refer toDiagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code Descriptions) and perform the appropriate diagnostic procedure.

pro multis · About Operation CHARM