Symptoms - Automatic Transmission. GMC Truck Yukon XL

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2009 🢒 Yukon XL - 2WD 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Symptoms - Automatic Transmission

Symptom Diagnosis

Diagnostic Category

Diagnostic Information

DEFINITION: This table consists of 9 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

•	Refer to Transmission Fluid Check.

•	Refer to Oil Pressure High or Low.

•	Refer to Fluid Leak Diagnosis.

•	Refer to 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

•	Refer to Ratcheting Noise.

•	Refer to Ticking Noise in Reverse.

•	Refer to Vibration in Reverse and Whining Noise in Park.

•	Refer to Popping Noise.

•	Refer to Whine Noise Varying with RPM or Fluid Pressure.

•	Refer to Buzz Noise or High Frequency Rattle Sound.

•	Refer to 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

•	Refer to Drives in Neutral.

•	Refer to No Park.

•	Refer to No Reverse or Slips in Reverse.

•	Refer to No Drive in All Ranges.

•	Refer to No Drive in Drive Range.

•	Refer to No Overrun Braking - Manual 3-2-1.

•	Refer to Range Selector Displays Incorrect Range.

Shift Quality (Feel) Diagnosis

This category contains the following topic:

•	Harsh, soft or slipping shifts

•	Harsh, soft or delayed engagement

•	Shift shudder, flare or tie-up

•	Refer to Harsh Shifts.

•	Refer to Slipping or Harsh 1-2 Shift.

•	Refer to No 2-3 Shift or 2-3 Shift Slips, Rough or Hunting.

•	Refer to No 3-4 Shift, Slips or Rough 3-4 Shift.

•	Refer to Harsh Garage Shift.

•	Refer to Delay in Drive and Reverse.

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

•	Refer to First Gear Range Only - No Upshift.

•	Refer to Third Gear Only.

•	Refer to Second/Third Gear Only or First/Fourth Gears Only.

•	Refer to Slips in First Gear.

•	Refer to Slipping or Harsh 1-2 Shift.

•	Refer to No 2-3 Shift or 2-3 Shift Slips, Rough or Hunting.

•	Refer to No 3-4 Shift, Slips or Rough 3-4 Shift.

•	Refer to No Part Throttle or Delayed Downshifts.

•	Refer to Second Gear Start.

Shift Speed Diagnosis

This category contains the following topic:

Inaccurate or inconsistent shift points

Refer to 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

•	Refer to Torque Converter Diagnosis.

•	Refer to No Torque Converter Clutch Apply.

•	Refer to No Torque Converter Clutch Release.

•	Refer to Torque Converter Clutch Shudder.

Indicator On or Message Center Displays Message

This category contains the following topics:

Message Center displays "change trans fluid"

Refer to Transmission Component and System Description.

If symptom is not found

•	Refer to Transmission Fluid Check.

•	Refer to Road Test.

•	Refer to Line Pressure Check.