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Tahoe / Yukon Service Manual

DTC P00FF, P0700, P25A2, or P26C8

Engine Controls and Fuel - 3.0L LM2 Diesel | Diagnostic Information and Procedures | Document ID: 5500643 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 P00FF Body Control Module Requested Malfunction Indicator Lamp Illumination DTC P0700 Transmission Control Module Requested Malfunction Indicator Lamp Illumination DTC P25A2 Brake System Control Module Requested Malfunction Indicator Lamp Illumination DTC P26C8 Chassis Control Module Requested Malfunction Indicator Lamp Illumination Circuit/System Description The DTC is an informational DTC. The DTC indicates an emission related DTC set in the following control module: K9 Body Control Module K17 Electronic Brake Control Module or K160 Brake System Control Module K38 Chassis Control Module K71 Transmission Control Module The control module K20 turns on the malfunction indicator lamp (MIL) when the requesting control module sends a message over serial data. Conditions for Running the DTC Ignition = On or Engine = Running — For greater than 3 s Frequency the DTC runs = Continuously — After the running conditions are met Conditions for Setting the DTC An emission related DTC set in the following control module: K9 Body Control Module K17 Electronic Brake Control Module or K160 Brake System Control Module K38 Chassis Control Module K71 Transmission Control Module Actions Taken When the DTC Sets DTCs listed in the DTC Descriptor category = Type A DTC Conditions for Clearing the DTC DTCs listed in the DTC Descriptor category = Type A DTC Reference Information DTC Type Reference Powertrain Diagnostic Trouble Code (DTC) Type Definitions Scan Tool Reference Control Module References Circuit/System Verification

  1. Verify there are no DTCs set related to the following component/system: Engine Controls and Fuel Serial Data ⇒ If a related DTC is set Refer to: Diagnostic Trouble Code (DTC) List - Vehicle ⇓ If a related DTC is not set
  2. Verify there are no DTCs set related to the following component/system: Body Systems Brakes Chassis Control Module Transmission ⇒ If a related DTC is set Refer to: Diagnostic Trouble Code (DTC) List - Vehicle ⇓ If a related DTC is not set
  3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data. Verify no other DTCs are set. ⇒ If other DTCs are set Refer to: Diagnostic Trouble Code (DTC) List - Vehicle ⇓ If no other DTCs are set
  4. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification For control module replacement, programming, and setup refer to: Control Module References