Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSPONTIAC2008GRAND PRIX BASEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 338 (AUTOMATIC TRANSMISSION - MU4)
2008 Pontiac Grand Prix Base
Section 338 (Automatic Transmission - Mu4)
2008 Pontiac Grand Prix BaseSECTION Section 338 (Automatic Transmission - Mu4)
WARNING: This page is about a different car, the 2008 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
- Specifications
- Schematic and Routing Diagrams
- Component Locator
- Diagnostic Information and Procedures
- Diagnostic Code Index
- Diagnostic Starting Point - Automatic Transmission
- Scan Tool Output Controls
- Scan Tool Data List
- Scan Tool Data Definitions
- DTC P0500
- DTC P0705
- DTC P0724
- DTC P0741
- DTC P0750
- DTC P0751
- DTC P0753
- DTC P0755
- DTC P0756
- DTC P0758
- DTC P0770
- DTC P0773
- DTC P0850
- DTC P0973
- DTC P0974
- DTC P0976
- DTC P0977
- DTC P1760
- DTC P1520
- DTC P1780
- DTC P2716
- DTC P2769
- DTC P2770
- Symptoms - Automatic Transmission
- Overdrive Off Indicator Always On
- Overdrive Off Indicator Inoperative
- Transmission Fluid Check
- Line Pressure Check
- Road Test
- Stall Speed Test
- Torque Converter Diagnosis
- Flexplate/Torque Converter Vibration Test
- Engine Coolant/Water in Transmission
- Fluid Leak Diagnosis
- Fluid Discolored or Smells Burnt
- Unable to Run in All Ranges
- Harsh Engagement into any Drive Range
- Harsh Downshift
- No Downshift when Coasting
- Downshift Occurs too Quickly or too Late
- No O/D-3, 3-2, or 2-1 Kickdown
- No Engine Braking in 2 or L Range
- Vehicle does Not Hold in P Range
- Repair Instructions - On Vehicle
- Manual Selector Replacement
- Overdrive Switch Replacement
- Shift Select Cable Replacement
- Park/Neutral Position Switch
- Automatic Transmission Fluid and Filter Replacement
- Filler Tube Replacement
- Vehicle Speed Sensor Replacement
- Transmission Cooler Pipes and Hoses Replacement
- Solenoids and Wiring Harness Replacement
- Drive Axle Shaft Seal Replacement
- Transmission Mount Replacement - Left Side
- Transmission Front Mount Replacement
- Transmission Rear Mount Replacement
- Transaxle Replacement
- Torque Converter Replacement
- Repair Instructions - Off Vehicle
- Transmission Fluid Cooler Flushing (Flushing Procedure)
- Transmission Fluid Cooler Flushing (J-45096)
- Transmission Overhaul
- Second Coast Brake Removal
- First Reverse Brake Removal
- First Reverse Brake Piston Removal
- Underdrive Clutch Removal
- Underdrive Brake Removal
- Torque Converter Housing Removal
- Case Assembly Cleaning
- Second Coast Brake Replacement
- Intermediate One-Way Clutch Replacement
- First Reverse Brake Assembly Replacement
- Underdrive Clutch Assembly Replacement
- Underdrive Brake Assembly Replacement
- Differential Side Bearing Preload Adjustment
- Underdrive Brake Assembly Installation
- Underdrive Clutch Assembly Installation
- First Reverse Brake Assembly Installation
- Second Coast Brake Installation
- Torque Converter Housing with Fluid Pump Assembly Removal
- Front Planetary Gear Removal
- Rear Planetary Gear Removal
- Torque Converter Housing Removal
- Transmission Fluid Pump Replacement
- Direct Clutch Replacement
- Forward Clutch Removal
- Forward Clutch Assembly Installation
- Rear Planetary Gear Replacement
- Intermediate Shaft Replacement
- Counter Gear Shaft Assembly Replacement
- Counter Gear Shaft Assembly Installation
- Intermediate Shaft Installation
- Front Planetary Gear and Reaction Sun Gear Drum Installation
- Torque Converter Housing with Fluid Pump Assembly Installation
- Description and Operation
- Special Tools and Equipment
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.