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Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–34 • The TCM records the operating conditions when the conditions for setting the DTC are met. The TCM stores this • The TCM stores DTC P0218 in TCM history. Conditions for Clearing the DTC • Tech 2 can clear the DTC. • The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without a non-emission • The TCM cancels the DTC default actions when the fault no longer exists and the DTC passes. Diagnostic Aids • Tech 2’s Transmission Fluid Temp. should rise steadily to a normal operating temperature, then stabilise. • Ask about the customer's driving habits, trailer towing, etc. Trailer towing should occur in D3. • Refer to Symptoms - Automatic Transmission in 7C3 Automatic Transmission – 4L60E – Hydraulic and Mechanical Test Description The following numbers refer to the step numbers in the diagnostic table: 2 Low transmission fluid can cause the transmission to overheat. 3 This step inspects for airflow restrictions or damage, which may result in the transmission overheating. 4-5 Decreased line pressure will cause the transmission to overheat. The torque converter stator is the pump for the transmission fluid. If the torque converter is damaged, it may not be producing the required pressure. DTC P0218 Diagnostic Table Step Action Yes No 1 Has the Diagnostic System Check been performed? Go to Step 2 Refer to 4.7 Diagnostic System Check 2 1 Connect Tech 2 to the DLC. 2 Turn on the ignition, with the engine off. N O T E Before clearing the DTC, use the Tech 2 Freeze Frame/Failure Record to record the transmission 3 On Tech 2 select: 4 Select the relevant DTC and note the parameters at the time of 5 On Tech 2 select: 6 Follow the instructions on Tech 2 and clear the DTCs. 7 Inspect for correct transmission fluid level, refer to Did you perform the fluid checking procedure? Go to Step 3 Perform the transmission fluid checking procedure, refer to 7C4 Automatic Transmission – 4L60E – On-vehicle Servicing |