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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 59 (Automatic Transmission Diagnosis - 4L80-E) >> Diagnostic Tests >> DTC P0218: Transmission Fluid OVERTEMPERATURE >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 GMC Yukon XL, 2002 GMC Sierra, 2002 Chevrolet Suburban, and 2002 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Install a scan tool. Turn ignition on, engine off. Before clearing the DTCs, use the scan tool to record the freeze frame and failure records. Using the CLEAR INFO function erases the failure records from the PCM. Record the failure records. Clear the DTCs. Perform the transmission fluid checking procedure. See appropriate AUTOMATIC article in TRANSMISSION SERVICING. Was the fluid checking procedure performed? If so, go to next step. If not, perform the transmission fluid checking procedure. See appropriate AUTOMATIC article in TRANSMISSION SERVICING.
  3. Inspect for the following conditions:
    • Engine cooling system for air flow restrictions, air flow blockage, system fluid level and condition, or debris.
    • Transmission cooling system for air flow restrictions, air flow blockage, debris, damaged cooler lines or hoses, or low transmission fluid cooler flow.

    Did you find and correct the condition? If so, go to step  6. If not, go to next step.

  4. Perform the line pressure check procedure. See HYDRAULIC PRESSURE TESTS  under PERFORMANCE TESTS. Did you find and correct the condition? If so, go to step  6. If not, go to next step.
  5. Inspect the torque converter stator for damage. See appropriate OVERHAUL article. Did you find and correct the condition? If so, go to next step. If not, see SYMPTOM DIAGNOSIS  under TROUBLE SHOOTING.
  6. Perform the following procedure to verify the repair:
    • Select DTC.
    • Select CLEAR INFO.
    • Turn ignition on, engine off.
    • The transmission fluid temperature must be less than 265°F (129°C) for at least 5 seconds.
    • Select SPECIFIC DTC.
    • Enter DTC P0218.

    Has the test run and passed? If so, system is okay. If not, go to step  1.

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