Skip the auto shop - Our mechanics make house calls

Q: Differential leak while speeding

asked by on

My Solstice with LSD - limited slip differential has less than 3700 miles on it. I had the rear end serviced at the dealership about 17 months ago. I recently noticed a slight leaking and dust accumulation of the differential. So I cleaned it and it drove easily with no problem. I drove home Thursday on the freeway at 90 mph. When I got home I could smell and see the rear end leaking. I topped off the oil and tried driving it at a normal freeway speed to recreate the leak. Today I drove up to 115 mph, pulled over to the side of the road and it had leaked onto the road. The differential and exhaust were oily. It’s coming down from the top left. The metal vent area is dry. Is the vent stuck open blowing a mist of oil at high speeds? The right axle seal is dry, but maybe it’s doing the same thing. I can’t hear or feel any grinding or chattering when I turn. Do you have any thoughts?

Hey there, thanks for writing in about your 2009 Pontiac Solstice. The first thing to try is to see if there are sealing washers on the plugs of the differential. If the washers have mushroomed or are worn, some fluid may been allowed to leak by. Make sure the proper grade of oil is used. If you try and clean it up, you may be able to see exactly where the leak is coming from. If you need help with this, consider having a qualified technician, such as one from YourMechanic, find the differential leak and have this issue resolved.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Heater won't work

The lack of heat being generated by your system may indicate a clogged heater core. The [heater core]((https://www.yourmechanic.com/services/heater-is-not-working-inspection) is a small radiator like unit that circulates the hot coolant from the engine through the heater core which then uses this...

Q: Fuel is leaking.

This suggests that you may have a fuel leak. There are many different places where the car may be leaking fuel from. There are fuel lines that run from the fuel tank along the underneath side of the chassis up...

Q: Why is my car idling high at an RPM of 1200?

This may be caused by a dirty or failing idle air control valve/module. As you may know, this is a unit that monitors the air intake as it is mixed with fuel prior to being injected into the engine. When...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.