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 MANUALSGMC2020ACADIA SLREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 312 (REAR DRIVE AXLE)
2020 GMC Acadia SL
Section 312 (Rear Drive Axle)
2020 GMC Acadia SLSECTION Section 312 (Rear Drive Axle)
WARNING: This page is about a different car, the 2023 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
- Specifications
- Schematic Wiring Diagrams
- Diagnostic Information and Procedures
- DTC C0393 (G99)
- Diagnostic Instructions
- DTC Descriptor
- Diagnostic Fault Information
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Action Taken When the DTC Sets
- Conditions for Clearing the DTC
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Instructions
- DTC C0407
- Diagnostic Instructions
- DTC Descriptors
- Diagnostic Fault Information
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Action Taken When the DTC Sets
- Conditions for Clearing the DTC
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Instructions
- DTC C056D
- DTC C122F
- DTC C1230 or C1231 (G99)
- DTC C1244, C1245, or C124B
- DTC C1260-C1267
- DTC C1282
- DTC C1290-C1295
- DTC C1296
- DTC C12A1 or C12A9 (G99)
- Symptoms - Rear Differential Carrier
- Noisy in Drive
- Noisy When Coasting
- Intermittent Noise
- Constant Noise
- Noisy on Turns
- Rear Differential Carrier Leak Diagnosis
- DTC C0393 (G99)
- Repair Instructions
- Rear Differential Clutch Control Module Replacement
- Rear Axle Lubricant Level Inspection
- Rear Axle Lubricant Replacement
- Differential Clutch Oil Replacement
- Differential Carrier Bushing Replacement - Rear
- Driveline Torque Tube Replacement
- Rear Axle Shaft Seal Replacement
- Differential Carrier Assembly Replacement
- Differential Carrier Insulator Replacement
- Differential Drive Pinion Gear Seal Replacement
- Rear Differential Hydraulic System Service Fill/Bleed
- 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.