P0882

DTC P0882 or P0883

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.

DTC Descriptors
DTC P0882
- Transmission Control Module (TCM) Power Input Circuit Low Voltage

DTC P0883
- Transmission Control Module (TCM) Power Input Circuit High Voltage

Circuit/System Description

The transmission control module (TCM) requires continuous battery voltage to operate. The TCM monitors the battery voltage.

Conditions for Running the DTC

* Engine speed is greater than 200 RPM for 10 seconds.
* Engine speed is greater than 450 RPM.

Conditions for Setting the DTC

P0882

The TCM detects battery B+ voltage below a threshold based on transmission fluid temperature for 5 seconds. Threshold varies from 7.5 V for temperatures below -60°C (-76°F) to 9 V for temperatures above 20°C (68°F).

P0883

The TCM detects battery B+ Voltage above 18 V 60 percent of the time during a 1 second interval.

Action Taken When the DTC Sets

P0882 or P0883
* DTCs P0882 and P0883 are Type C DTCs.
* If the DTC sets with transmission in a forward range, the transmission will shift to 1st, 3rd, or 5th gear. If the transmission was in reverse, the transmission will shift to reverse or neutral.
* The TCM inhibits torque converter clutch (TCC) engagement.
* The TCM commands maximum line pressure.

Conditions for Clearing the DTC

DTCs P0882 and P0883 are Type C DTCs.

Diagnostic Aids

P0882
* A defective vehicle battery may allow DTC P0882 to set.
* A defective vehicle charging system may allow DTC P0882 to set.
* You may have to drive the vehicle in order to experience a condition.
* Vehicle accessories imposing a large electrical load on the battery circuit could cause DTC P0882 to set.
* Although DTC P0882 could indicate an internal voltage condition within the TCM, in most cases, the TCM is not at fault. Investigate thoroughly prior to replacing the TCM.

P0883
* A defective vehicle charging system may allow DTC P0882 to set.
* You may have to drive the vehicle in order to experience a condition.

Reference Information
Schematic Reference

Automatic Transmission Controls Schematics (Allison - Automatic Transmission)
Connector End View Reference

* Component Connector End Views (Connector End Views By Name)
* Inline Harness Connector End Views (Connector End Views By Number)

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 (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

DTC Type Reference

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

Control Module References (Control Module References) for scan tool information

Circuit/System Verification

1. Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The reading should be between 12.6-15 V.

• If not the expected value, refer to Charging System Test (Charging System Test).

2. Observe the scan tool TCM ignition voltage parameter. The reading should be between 12.6 and 15 V.
3. 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 OFF, and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Disconnect the harness connector at the TCM.
2. Test for less than 3 ohms between ground circuit terminal 9 and battery ground, and between ground circuit terminal 69 and battery ground.

• If greater than the specified range, repair the affected ground circuit.

3. Verify that a test lamp illuminates between battery B+ circuit terminal 10 and ground, and battery B+ circuit terminal 70 and ground.

• If the test lamp does not illuminate, test the affected B+ circuit for a short to ground or an open/high resistance. If circuit tests normal, replace the TCM.

Repair Instructions

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

* Wiring Harness Replacement (Allison - Automatic Transmission)
* Control Module References (Control Module References) for TCM replacement, setup, and programming

Repair Verification

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