For 1990-2009 cars

### 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 provide an overview of each diagnostic category.

### DTC Descriptor

DTC P0700 00: Transmission Control Module Requested MIL Illumination

### Circuit/System Description

The transmission control module (TCM) uses the controller area network (CAN) to signal the engine control module (ECM) that the TCM is requesting malfunction indicator lamp (MIL) illumination. This happens when the TCM determines that a failure that affects emissions within the transmission control system. When the ECM receives the message from the TCM, DTC P0700 will set.

### Conditions for Running the DTC

The ignition is ON.

### Conditions for Setting the DTC

The TCM is requesting MIL illumination.

### Action Taken When the DTC Sets

DTC P0700 00 is a Type A DTC.

### Conditions for Clearing the DTC

DTC P0700 00 is a Type A DTC.

### Diagnostic Aids

DTC P0700 00 can not be cleared from the ECM until the related TCM codes have been cleared.

### Reference Information

#### DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

### Circuit/System Verification

Note: Correct any engine control module (ECM) DTCs before diagnosing TCM DTCs

DTC P0700 00 is an informational DTC. If there are no other engine control module (ECM) DTCs set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for diagnosis of TCM DTCs.