P0881

DTC P0881

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 Descriptor
DTC P0881
- Transmission Control Module (TCM) Power Input Performance

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 500 RPM or greater.

Conditions for Setting the DTC

Condition 1

The TCM detects battery B+ voltage below 6.5 V for 0.5 seconds within a 1.5 second period.

Condition 2

The TCM detects a variation in battery B+ voltage greater than 5 V for 0.5 seconds within a 1.5 second period.

Action Taken When the DTC Sets

* DTC P0881 is a Type C DTC.
* If the DTC sets with the transmission in a forward range, the transmission will shift to first, third or fifth gear. If the transmission was in reverse, the transmission will shift to reverse or neutral.
* The TCM inhibits torque converter clutch (TCC) engagement.
* Maximum line pressure is commanded.

Conditions for Clearing the DTC

DTC P0881 is a Type C DTC.

Diagnostic Aids

* A defective vehicle battery may allow this code to set.
* A defective vehicle charging system may allow this code 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 this DTC to set.
* Although this DTC 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.

Reference Information
Schematic Reference

Automatic Transmission Controls Schematics (Diagrams)
Connector End View Reference

* Component Connector End Views (Connector Views)
* Inline Harness Connector End Views (Diagrams)

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 (Programming and Relearning) 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 Battery Charging (Procedures).

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.

• If the test lamp does not illuminate, repair the affected B+ circuit.
• If circuits test normal, replace the TCM.

Repair Instructions

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

* 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 to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle) and perform the appropriate diagnostic procedure.