Diagnostic Instructions
DTC Descriptor
DTC P1895: Engine Torque Delivered Signal Message Counter Incorrect - CAN Signal
DTC P1896: Engine Control Module (ECM) Driver Torque Request Signal Invalid Data - CAN Signal
Circuit/System Description
The transmission control module (TCM) receives the engine torque signal and the driver requested engine torque via CAN bus The TCM needs this signal to select the appropriate gear and to choose the correct shift pattern.
Conditions for Running the DTC
P1895, P1896
| • | The ignition voltage is between 10.2 V and 15.5 V. |
| • | The engine speed is greater than 400 RPM for 2 s. |
| • | The transmission is not in emergency mode. |
| • | Accessory ON for more than 3 s. |
| • | TCM communication is normal. |
Conditions for Setting the DTC
P1895
TCM receives engine actual steady state torque validity is "Invalid" for 4 s continuously.
P1896
TCM receives engine non-transmission regulated steady state torque validity is "Invalid" for 4 s continuously.
Action Taken When the DTC Sets
P1895
| • | DTCs P1895 is Type B DTC. |
| • | Driver requested engine torque = max torque N.m (ft-lb). |
| • | The TCM turns OFF all solenoids. |
| • | The TCM allows the vehicle to operate only in the second gear "R" range after a stop. |
P1896
| • | DTCs P1896 is Type C DTC. |
| • | Driver requested engine torque = max torque N.m (ft-lb). |
| • | The TCM turns OFF all solenoids. |
| • | The TCM allows the vehicle to operate only in the second gear "R" range after a stop. |
Conditions for Clearing the DTC
P1895
| • | DTC P1895 is Type B DTC. |
| • | TCM receives engine actual steady state torque validity is "Valid" for 5 min continuously. |
P1896
| • | DTC P1895 is Type C DTC. |
| • | TCM receives engine non-transmission regulated steady state torque validity is "Valid" for 5 min continuously. |
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
Description and Operation
Transmission Component and System Description
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Verify DTC U0100 is not set.
| ⇒ | If DTC U0100 is set, diagnose this first. |
| ⇒ | If DTC U0100 is not set, replace K20 Engine Control Module (ECM). |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic procedure.
