Symptoms - Automatic Transmission. GMC Truck Yukon XL

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2005 🢒 Yukon XL - 4WD 🢒 Transmission/Transaxle 🢒 Automatic Transmission - 4L60-E/4L65-E 🢒 Symptoms - Automatic Transmission

Symptom Diagnosis

Diagnostic Category

Diagnostic Information

This table consists of nine diagnostic categories that are located in the left column. Using this column, choose the appropriate category based on the operating conditions of the vehicle or transmission. After selecting a category, use the right column to locate the specific symptom diagnostic information.

Fluid Diagnosis

This category contains the following topics:

•	Fluid condition - appearance, contaminants, smell, overheating

•	Line pressure - high or low

•	Fluid leaks

•	Transmission Fluid Check

•	Oil Pressure High or Low

•	Fluid Leak Diagnosis procedure

•	Oil Out the Vent

Noise and Vibration Diagnosis

This category contains the following topics:

•	Ratcheting noise

•	Noise - drive gear, final drive, whine, growl, rattle, buzz, popping

•

Vibration

•	Ratcheting Noise

•	Refer to Ticking Noise in Reverse

•	Vibration in Reverse and Whining Noise in Park

•	Popping Noise

•	Whine Noise Varying with RPM or Fluid Pressure

•	Buzz Noise or High Frequency Rattle Sound

•	Noise in Random Ranges

Range Performance Diagnosis

This category contains the following topics:

•	Drives in Neutral

•

No Park

•	No Reverse

•

No Drive

•	No engine braking

•	Shift selector indicator does not match transmission gear range

•	Lack of Power or Hesitation

•	Drives in Neutral

•

No Park

•	No Reverse or Slips in Reverse

•	No Drive in All Ranges

•	No Drive in Drive Range

•	No Overrun Braking - Manual 3-2-1

•	Range Selector Displays Incorrect Range

•	Lack of Power or Hesitation

Shift Quality (Feel) Diagnosis

This category contains the following topics:

•	Harsh, soft or slipping shifts

•	Harsh, soft or delayed engagement

•	Shift shudder, flare or tie-up

•	Harsh Shifts

•	Slipping or Harsh 1-2 Shift

•	No 2-3 Shift or 2-3 Shift Slips, Rough or Hunting

•	No 3-4 Shift, Slips or Rough 3-4 Shift

•	Harsh Garage Shift

•	Delay in Drive and Reverse

•	3-2 Flare or Tie-Up

Shift Pattern

This category contains the following topics:

•	One forward gear only

•	Two forward gears only

•	Gear missing or slipping

•	No upshift or slipping upshift

•	No downshifts

•	Non-First gear start

•	First Gear Range Only - No Upshift

•	Third Gear Only

•	Second/Third Gear Only or First/Fourth Gears Only

•	Slips in First Gear

•	Slipping or Harsh 1-2 Shift

•	No 2-3 Shift or 2-3 Shift Slips, Rough or Hunting

•	No 3-4 Shift, Slips or Rough 3-4 Shift

•	No Part Throttle or Delayed Downshifts

•	Second Gear Start

Shift Speed Diagnosis

This category contains the following topic:

Inaccurate or inconsistent shift points

Inaccurate Shift Points

Torque Converter Diagnosis

This category contains the following topics:

•	Torque converter diagnosis

•	TCC does not apply

•	TCC does not release

•	TCC apply/release quality

•	Torque Converter Diagnosis

•	No Torque Converter Clutch Apply

•	No Torque Converter Clutch Release

•	Torque Converter Clutch Shudder

Indicator On or Message Center Displays Message

This category contains the following topics:

•	4WD light does not illuminate

•	Tow/haul light does not illuminate

•	Message Center displays "Trans Fluid Hot"

•	Message Center displays "Trans Hot...Idle Engine"

•

DTC P2771

•	Tow/Haul Switch/Indicator Always On or Inoperative

•	Transmission Fluid Check

•	Transmission Overheats

If symptom is not found

•	Transmission Fluid Check

•

Road Test

•	Line Pressure Check