With ATH

DTC P0513 (with ATH)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor
DTC P0513
- Theft Deterrent Key Incorrect

Circuit/System Description

The remote control door lock receiver (RCDLR) sends the prerelease password to the engine control module (ECM) via the serial data circuit. The ECM then sends a challenge to the RCDLR. Both the ECM and RCDLR perform a calculation on this challenge. If the calculated response from the RCDLR equals the calculation performed by the ECM, the ECM will allow vehicle starting.

Conditions for Running the DTC

Ignition is in the ACCESSORY or RUN position.

Conditions for Setting the DTC

The calculated response from the RCDLR does not equal the calculation performed by the ECM.

Action Taken When the DTC Sets

* The security indicator will illuminate.
* Vehicle starting will be disabled.

Conditions for Clearing the DTC

* A current DTC P0513 will be when a valid calculation is received.
* A history DTC will be cleared after 40 malfunction-free ignition cycles or when a scan tool is used to clear DTCs.

Diagnostic Aids

The "key" referenced in the DTC descriptor does not refer to the vehicle key. In this case, "key" is referring to the challenge response.

Reference Information
Schematic Reference

Immobilizer Schematics Immobilizer Schematics
Connector End View Reference

Component Connector End Views Connector Views
Description and Operation

Immobilizer Description and Operation (with ATH) Immobilizer Description and Operation (with ATH)Immobilizer Description and Operation (without ATH) Immobilizer Description and Operation (without ATH)
Electrical Information Reference

* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

Important: Because of normal system communications between the RCDLR and ECM, any theft deterrent B-codes must be diagnosed prior to the diagnosis of P-codes.


Perform the 10-Minute Immobilizer Relearn procedure. Refer to Immobilizer System Component Programming (with ATH) Immobilizer System Component Programming (with ATH)Immobilizer System Component Programming (without ATH) Immobilizer System Component Programming (without ATH). The ECM should successfully complete the password learn and the vehicle should start.

If the ECM does not complete the learn or vehicle starting remains disabled, replace the ECM.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

Control Module References Control Module References for ECM replacement, setup, and programming