Symptom Table

SYMPTOM TABLE

Condition	Possible Sources	Action
Transmission overheating	Excessive vehicle or towing loads, severe vehicle use.	REFER to the vehicle specification manual for load and GVW/GCW information. REFER to the owner's guide.
	Incorrect fluid level.	CHECK and, if necessary, ADJUST the fluid to the correct level. REFER to FLUID LEVEL CHECK or FLUID LEVEL CHECK .
	Fluid condition.	CHECK fluid condition. REFER to FLUID CONDITION CHECK or FLUID CONDITION CHECK .
	Incorrect fluid type.	REFER to SPECIFICATIONS .
	Transmission cooling system damaged, blocked, restricted or installed incorrectly.	CARRY OUT the transmission fluid cooler flow test. REFER to TRANSMISSION FLUID COOLER or TRANSMISSION FLUID COOLER FLOW TEST .
	System leaks.	REFER to AUTOMATIC TRANSMISSION - 6HP26 or AUTOMATIC TRANSMISSION - 4R70E/4R75E .
	Engine overheating.	REFER to PINPOINT TEST B: THE ENGINE OVERHEATS .
	Powertrain control system electrical inputs/outputs, vehicle wiring harnesses, powertrain control module (PCM), torque converter clutch (TCC) solenoid.	CARRY OUT on-board diagnostics. REFER to INTRODUCTION - GASOLINE article , and ON-BOARD DIAGNOSTICS WITH DIAGNOSTIC TOOL or ON-BOARD DIAGNOSTICS WITH DIAGNOSTIC TOOL .
	Internal transmission concerns.	REFER to PRELIMINARY INSPECTION or PRELIMINARY INSPECTION .
Fluid leak at transmission in-tank cooler	Transmission fluid cooler fitting.	REFER to the COMPONENT TEST .