• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
The controller area network (CAN) serial data bus is used by the engine control module (ECM) and automatic transmission control module (TCM) to share information. An example of information shared is engine speed, engine coolant temperature, manifold absolute pressure (MAP), throttle position, and vehicle speed.
• | The ignition is ON. |
• | The engine is running greater than 2 seconds. |
• | The ignition 1 voltage is greater than 11 volts. |
• | No output controls are active. |
The ECM does not detect a valid message from the TCM.
DTC P1601 is a Type B DTC.
DTC P1601 is a Type B DTC.
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
⇒ | If no communication with the TCM, refer to Scan Tool Does Not Communicate with CAN Device for further diagnosis. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for engine control module replacement, setup, and programming