5L40-E/5L50-E - Automatic Transmission
DTC P1831 or P1832
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy 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 Descriptor
DTC P1831
- Pressure Control (PC)/Shift Lock Solenoid Control Circuit Low Voltage
DTC P1832
- Pressure Control (PC)/Shift Lock Solenoid Control Circuit High Voltage
Circuit/System Description
The transmission control module (TCM) high side driver 2 is located inside of the control solenoid (w/body and TCM) valve assembly and is not serviced separately. The high side driver 2 provides the voltage for the TCM pressure control solenoids and shift solenoids. This fault is handled inside the TCM and no external circuits are involved.
Conditions for Running the DTC
P1831
The engine run time is greater than 5 seconds.
P1832
The ignition is ON.
Conditions for Setting the DTC
P1831
The TCM detects a short to ground on the HSD1 circuit when the HSD1 is commanded ON.
P1832
The TCM detects greater than 6.4 volts at the HSD1 terminal prior to commanding the HSD1 ON.
Action Taken When the DTC Sets
* DTC P1831 and P1832 are Type C DTCs.
* SERVICE VEHICLE SOON displays on the driver information center (DIC).
* The TCM commands maximum line pressure.
* The TCM freezes transmission adaptive functions.
Conditions for Clearing the DTC
DTC P1831 and P1832 are Type C DTCs.
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)
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
Transmission Control Module Scan Tool Information (5L40-E) (Transmission Control Module Scan Tool Information (5L40-E))Transmission Control Module Scan Tool Information (6L50/6L80/6L90) (Transmission Control Module Scan Tool Information (6L50/6L80/6L90))
Circuit/System Testing
1. Clear the DTC and operate the vehicle under the conditions for running and setting the DTC.
2. Observe the High Side Driver CKT Status parameter. The parameter should display OK.
• If the parameter displays Open, Short to Ground, Short to Voltage, or the DTC resets, replace the control solenoid (w/body and TCM) valve assembly. Refer to Control Module References (Programming and Relearning) for replacement, setup, and programming.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the repair.
* Pressure Control Solenoid Valve Replacement (Service and Repair)
* Transmission Internal Electrical Harness Replacement (Service and Repair)
* Control solenoid (w/body and TCM) valve assembly replacement. Refer to Control Module References (Programming and Relearning) for replacement, setup, and programming.