Skip the auto shop - Our mechanics make house calls

Q: Coolant leak codes

asked by on

My car has fewer than 98000 on it and it runs really good and it has great on mileage. I drive a 37 mile stop and go commute every day. It has a whole lot of power and idles smooth. But lately I’ve been getting a PO2187 code, but I can’t find a vac leak. So I decided to clear the code. But then I got more codes 300, 301 and 302 about misfiring which I never noticed. I looked under the hood and saw the coolant level was low, and I filled it. When I got home today and went to check my coolant level again, it was laying on top of my new upper motor mount and some was on top of the reservoir and down below the air inlet hose for the turbo I think. It’s a big thick hose. There is no pressure in the expansion tank because the cap is a 21 PSI which doesn’t like pressure. And my temperature needle is at half way and never passes that mid point. With all of these symptoms I guess this could be a leak in the head gasket. But I think no because there is no water in the oil and the car runs fine. What do you think is wrong and how can I fix this?

A: The code P2187 indicates a lean running sit...

The code P2187 indicates a lean running situation at idle. More parameters will need to be checked to get to the bottom of this issue. Sometimes false reading from a malfunctioning mass air flow sensor may mess with the vehicle's engine control unit and cause a light.

As for the leak, you will probably want to get this checked soon to prevent any worse problems from occurring. If you are having trouble pinpointing the issues, consider having a qualified professional, such as one from YourMechanic, inspect the Check Engine Light and detect any leaks that may be present for you.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: The van stalls, jerks and hesitates

GM has a TSB out concerning clogged injectors that may cause all of the rough running/no start symptoms that you are experiencing. A professional fuel injector cleaning may help correct these various engine running issues. The procedure does require special...

Q: Gear shift lever broke

This is something that would need to be looked at in-person to see what is broken on the gear shifter, and scan the transmission to see what code is stored in it. You may have a complete shift linkage that...

Q: Transmission fluid leaked out

If your fluid has leaked out completely, I would suggest having the system thoroughly inspected by a certified mechanic.

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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.