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Tahoe / Yukon Service Manual

DTC P15F7

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 P15F7 Rear Object Detection Control Module Torque Request Signal Message Counter Incorrect Circuit/System Description The K124 Image Processing Module is constantly sending a serial data message to the K20 Engine Control Module requesting engine speed or torque reduction. The K20 Engine Control Module sets DTC P15F7 when it detects a discrepancy in the structure of the message causing the integrity of the message to be questioned. An intermittent fault in the serial data circuits will cause the engine control module to set DTC P15F7 Conditions for Running the DTC Vehicle speed is greater than 1 km/h (1 MPH) Conditions for Setting the DTC The K20 Engine Control Module detects that the engine speed and torque modification messages from the K124 Image Processing Module are either corrupted or intermittently missing. Action Taken When the DTC Sets The K124 Image Processing Module sends a serial data message to display the appropriate indicator message The K124 Image Processing Module features are unavailable. Conditions for Clearing the DTC The condition for the DTC is no longer present. The K20 Engine Control Module clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles. Reference Information Schematic Reference Driver Assistance Systems Schematics Connector End View Reference Master Electrical Component List Description and Operation Parking Assist 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 other K20 Engine Control Module or communication DTCs set. ⇒ If a DTC is set Refer to Diagnostic Trouble Code (DTC) List - Vehicle ⇓ If a DTC is not set
  2. Verify there are no intermittent serial data circuit faults. ⇒ If an intermittent serial data circuit fault is found Repair as necessary. ⇓ If an intermittent serial circuit fault is not found
  3. Clear DTCs and operate the vehicle in the conditions that the customer experienced.
  4. Verify DTC P15F7 does not set. ⇒ If the DTC sets Replace the K124 Image Processing Module ⇓ If the DTC does not set
  5. A fault is currently not present and may be an intermittent condition. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair. Control Module References for control module replacement, programming, and setup.