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 provides an overview of each diagnostic category.

### DTC Descriptor

DTC P0700: Transmission Control Module (TCM) 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 has determined that a failure that affects emissions has occurred in transmission control system. When the ECM receives the correct 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 is a type A DTC.

### Conditions for Clearing the MIL/DTC

DTC P0700 is a type A DTC.

### Diagnostic Aids

DTC P0700 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

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Refer to Diagnostic Trouble Code (DTC) List - Vehicle to correct any transmission DTCs.