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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission Diagnosis - 4L60-E >> Diagnostic Tests >> DTC P0218: Transmission Fluid OVERTEMPERATURE >> Diagnostic Procedure

Diagnostic Procedure

  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. Connect scan tool. Turn ignition on, engine off. Using scan tool, record freeze frame and failure records for reference, and then clear DTCs. Ensure transmission fluid level is correct. Fill if necessary. See appropriate AUTOMATIC article in TRANSMISSION SERVICING. If transmission fluid level is okay, go to next step.
  3. Check engine and transmission cooling system for restrictions, blockage or debris. Check transmission cooler lines for damage and check oil cooler flow. If a problem is found, repair as necessary. After repairs, go to step  6. If no problem is found, go to next step.
  4. Check transmission line pressure. See HYDRAULIC PRESSURE TESTS  under PERFORMANCE TESTS. If a problem is found, repair as necessary. After repairs, go to step  6. If no problem is found, go to next step.
  5. Check torque converter stator. See TORQUE CONVERTER DIAGNOSIS  under PERFORMANCE TESTS. If a problem is found, repair as necessary. After repairs, go to next step. If no problem is found, see DIAGNOSTIC AIDS .
  6. Using scan tool, clear DTCs. Start engine and allow it to reach normal operating temperature. Using scan tool, monitor engine run time and transmission fluid temperature parameters while test driving vehicle for at least 10 minutes. Ensure fluid temperature stabilizes and is less than 264°F (129°C). Check for DTCs. If DTC P0218 does not return, system is okay. If DTC P0218 returns, go to step  1.
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