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Tahoe / Yukon Service Manual

DTC P0513

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 Immobilizer Key Incorrect Circuit/System Description The body control module (BCM) sends the pre–release information to the engine control module (ECM) via the serial data circuit. The ECM then sends a challenge to the BCM. Both the ECM and BCM perform a calculation on this challenge. If the calculated response from the BCM 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 BCM does not equal the calculation performed by the ECM. Action Taken When the DTC Sets The security indicator in the instrument cluster will illuminate. Vehicle starting will be disabled. Conditions for Clearing the DTC A current DTCwill be cleared when a valid calculation is received. A history DTC will be cleared after 40 malfunction-free ignition cycles. Diagnostic Aids DTC P0513 may be caused by a loose connection or intermittent poor continuity on the ECM ground or at the negative battery cable. Be sure to check the ECM ground(s) and negative battery cable if normal system diagnosis does not correct the concern. Reference Information Schematic Reference Immobilizer Schematics Connector End View Reference Master Electrical Component List Description and Operation Immobilizer Description and Operation Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References for scan tool information Circuit/System Verification

  1. Verify there are no immobilizer DTCs set in the K9 Body Control Module. ⇒ If any immobilizer DTCs are set in the K9 Body Control Module Refer to Diagnostic Trouble Code (DTC) List - Vehicle. ⇓ If no immobilizer DTCs are set in the K9 Body Control Module
  2. Perform the K9 Body Control Module immobilizer learn using the body control module IMMO Function with Existing Transponder or Remote Key in SPS. Refer to Immobilizer System Component Programming.
  3. Verify the engine starts after the K9 Body Control Module completes the learn procedure. ⇒ If the engine does not start Perform the K20 Engine Control Module immobilizer learn using the engine control module IMMO Learn in SPS. Refer to Immobilizer System Component Programming. ⇓ If the engine starts
  4. All OK.