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 P280A: Transmission Range (TR) Switch Circuit Not Learned

### Circuit/System Description

This diagnostic addresses if the Gear Selector Neutral Position has not been learned.

### Conditions for Running the DTC

Not in Service Mode

### Conditions for Setting the DTC

Gear Selector Neutral Position has not been learned

### Action Taken When the DTC Sets

• | DTC P280A is a Type A DTC

• | Disable engine start

### Conditions for Clearing the DTC

DTC P280A is a Type A DTC

### Diagnostic Aids

Improper shift cable adjustment may cause DTC P280A to set. Refer to the Shift Control Cable Adjustment procedure.

### Reference Information

#### Schematic Reference

Automatic Transmission Controls Schematics

#### Connector End View Reference

• | Electrical Center Identification Views

• | Component Connector End Views

• | Splice Pack Connector End Views

• | Inline Harness Connector End Views

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### DTC Type Reference

• | Powertrain Diagnostic Trouble Code (DTC) Type Definitions

• | Diagnostic Trouble Code (DTC) List - Vehicle

#### Scan Tool Reference

Control Module References for scan information.

### Circuit/System Verification

1. Ignition ON, observe the DTC information with a scan tool.
2. Record Freeze Frame and Failure Records.
3. Clear DTCs.
4. Operate the vehicle under the conditions observed in the Failure Records.
5. Observe the DTC information with the scan tool. Verify that the DTC does not set.

⇒ | If DTC P280A is set, perform the Transmission Adaptive Learn and Transmission Neutral Learn procedure.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.