P0894
DTC P0894
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 Descriptor
DTC P0894
- Transmission Component Slipping
Circuit/System Description
When the engine controller requests the neutral locked turbine (NLT) feature, the transmission control module (TCM) commands the 3rd, 5th and reverse clutch and the 2-6 clutch to apply, which locks the turbine shaft. This provides a load to the engine and reduces the engine warm up time.
Conditions for Running the DTC
* Components are powered and the ignition voltage is greater than 9 V and less than 18 V.
* Engine speed is greater than 200 RPM and less than 7,500 RPM for 5 seconds.
* NLT is attained.
Conditions for Setting the DTC
The DTC sets when the TCM detects 3 accumulative events with turbine speed greater than 50 RPM for 3 seconds.
Action Taken When the DTC Sets
* The neutral locked turbine function is disabled.
* The TCM requests the engine control module (ECM) to illuminate the malfunction indicator lamp (MIL) on the second consecutive occurrence.
* DTC P0894 is stored in TCM history.
Conditions for Clearing the DTC
DTC P0894 is a Type B DTC.
Diagnostic Aids
* Shift solenoid valve performance codes, in conjunction with P0894, may indicate incorrect fluid level.
* Incorrect gear ratio codes may indicate clutch damage.
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
1. Inspect the transmission fluid level. Refer to Transmission Fluid Check (Transmission Fluid Check) .
2. Perform a road test. Refer to Road Test (Road Test Procedure) .
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. Perform a line pressure test. Refer to Line Pressure Check (Line Pressure Check) .
• If line pressure is low in all ranges, refer toLow Main Line Pressure in All Ranges (Low Main Line Pressure In All Ranges) .
• If line pressure is low in a specific range or ranges, refer toLow Main Line Pressure in Specific Ranges, Normal Pressure in Other Ranges (Low Main Line Pressure in Specific Ranges, Normal Pressure in Other Ranges) .
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.
2. Perform the clutch test. Refer to Clutch Test (Clutch Test) .
• If not the specified value, refer toExcessive Slippage and Clutch Chatter (Excessive Slippage and Clutch Chatter) .
Repair Verification
If another DTC is present, refer toDiagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code Descriptions) and perform the appropriate diagnostic procedure.