Symptom Troubleshooting Index

WARNING: This page is about a different car, the 2013 Acura MDX, 2012 Acura MDX, 2011 Acura MDX, and 2010 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Most problems in the SH-AWD unit can be diagnosed by identifying noises from the gears or bearings. Care should be taken during diagnosis not to confuse differential noises with those from other drivetrain components.

Symptom	Diagnostic Procedure	Also check for
The SH-AWD indicator does not go off, and no DTCs are stored	Symptom troubleshooting (see THE SH-AWD INDICATOR DOES NOT GO OFF, AND NO DTCS ARE STORED ).	Low battery voltage
The SH-AWD indicator does not come on	Symptom troubleshooting (see THE SH-AWD INDICATOR DOES NOT COME ON ).
Gear or bearing noises	Fluid level too low. Incorrect or worn out fluid. Damaged or chipped gears. Side case clearance incorrect. Incorrect tire size (rolling circumference).	Add fluid Drain and fill the differential Replace the differential carrier assembly Side case clearance adjustment
Rear differential overheats	Fluid level too low. Incorrect fluid type.	Add fluid Drain and fill the differential
Rear differential leaks fluid	Fluid level too high. Clogged breather hose. Worn or damaged oil seal. Damaged sealing washer. Loose mounting bolts or inadequate sealing.	Lower to proper level Clean or replace Replace the oil seal Replace the sealing washer Recheck torque or apply sealant
Rear differential screeches, whines, moans, or squeaks	Fluid level too low. Incorrect or worn out fluid. Incorrect tire rolling circumference. Damaged oil pump.	Add fluid Drain and fill the differential Adjust tire pressure or replace tires Replace the differential carrier assembly
Noise during acceleration, or when accelerating from a full stop	Incorrect side case clearance. Incorrect pre-load. Incorrect backlash of hypoid gear. Damaged or chipped gears. Incorrect tire size (rolling circumference).	Pre-load adjustment Side case clearance adjustment Replace the differential carrier assembly
HDS does not communicate with the SH-AWD control unit or the vehicle	Troubleshooting the DLC circuit (see DLC CIRCUIT TROUBLESHOOTING ).