Service Information

Volt

DTC P0700

Diagnostic Instructions

•	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.

DTC Descriptor

DTC P0700: Transmission Control Module Requested MIL Illumination

This DTC indicates that an emission related transmission DTC has set in the transmission control module (TCM). The engine control module (ECM) receives the TCM information over the serial data circuit. The ECM illuminates the malfunction indicator lamp (MIL) when the TCM sends a message over the serial data circuit requesting MIL illumination. The DTC information for the ECM will only display DTC P0700, but the freeze frame/failure records data may display the transmission DTC that set.

Conditions for Running the DTC

•	Vehicle ON for greater than 3 s.

•	DTC P0700 runs continuously when the above condition is met.

Conditions for Setting the DTC

The TCM has set an emissions related DTC.

Action Taken When the DTC Sets

DTC P0700 is a Type A DTC.

Conditions for Clearing the DTC

DTC P0700 is a Type A DTC.

Reference Information

Description and Operation

•	Hybrid Modes of Operation Description

•	Transmission General Description

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Note: : Correct any engine control DTCs before diagnosing TCM DTCs.

DTC P0700 is an informational DTC. If there are no other engine control DTCs set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for diagnosis of TCM DTCs.
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.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.