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Tahoe / Yukon Service Manual

DTC P00C7

Engine Controls and Fuel - 5.3L L84 or 6.2L L87 | Diagnostic Information and Procedures | Document ID: 6257365 Diagnostic Instructions Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions DTC Descriptor DTC P00C7 Intake Air Pressure Measurement System Sensor and Multiple Sensors Correlation Malfunction Circuit/System Description This system consists of the following components: B74 Manifold Absolute Pressure Sensor B75 Mass Airflow Sensor Conditions for Running the DTC DTC P0106, P0107, P0108, P14B6, P2227, P2228, P2229, P2230, P2610 = Not set DTC P0107, P0108, P2228, P2229 = Not pending DTC P2610 = Not set Barometric Pressure = 50 to 115 kPa (7.2 to 16.6 PSI) Engine = Not Running Manifold Absolute Pressure = 50 to 115 kPa (7.2 to 16.6 PSI) Time between current ignition cycle and the last time the engine was running = Greater than 10 s Frequency the DTC runs = Continuously — After the running conditions are met Conditions for Setting the DTC Manifold Absolute Pressure & Barometric Pressure = Not within 10 kPa (1.5 PSI) of each other. Actions Taken When the DTC Sets DTCs listed in the DTC Descriptor category = Type B DTC Conditions for Clearing the DTC DTCs listed in the DTC Descriptor category = Type B DTC Reference Information Schematic Reference Engine Controls Schematics Connector End View Reference Master Electrical Component List 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 Scan Tool Reference Control Module References Circuit/System Verification

  1. Ignition » On / Vehicle » In Service Mode
  2. Verify DTC P0106, P0107, P0108, P2227, P2228, P2229, P2230 is not set. ⇒ If any of the DTCs are set Refer to: Diagnostic Trouble Code (DTC) List - Vehicle ⇓ If none of the DTCs are set
  3. Verify the scan tool parameter: Throttle Body Idle Air Flow Compensation = Less than 90% ⇒ If 90% or greater Refer to: Throttle Body Cleaning ⇓ If less than 90%
  4. Verify the following conditions do not exist: B75 Mass Airflow Sensor — Cracked / Loose Clamps / Visible Damage / Water intrusion Q38 Throttle Body — Loose Clamps / Visible Damage Air Cleaner Element — Dirty / Restricted Catalytic Converter — Blocked / Restricted / Visible Damage Intake Air Duct & Intake Manifold — Cracked / Loose Clamps / Visible Damage » Refer to: Throttle Body Cleaning O-Ring @ B74 Manifold Absolute Pressure Sensor / Leaking / Missing / Visible Damage Positive Crankcase Ventilation System — Leaking / Incorrect connection / Restricted / Frozen Vacuum Hoses — Kinked / Leaking / Incorrect connection / Restricted Vacuum leak @ Engine / Intake Manifold / Q38 Throttle Body ⇒ If a condition exists Repair or replace as necessary ⇓ If no condition exists
  5. Verify the scan tool parameter: Barometric Pressure Sensor = The value should be within the range listed in the table: Altitude Versus Barometric Pressure Manifold Absolute Pressure Sensor = The value should be within the range listed in the table: Altitude Versus Barometric Pressure ⇒ If not in the specified range { Barometric Pressure Sensor } Refer to: DTC P10BC, P2228-P2230, or P227C-P227E. { Manifold Absolute Pressure Sensor } Refer to: DTC P0107 or P0108. ⇓ If in the specified range
  6. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification