Skip the auto shop - Our mechanics make house calls

Q: Loss of power going uphill and acceleration issues on flat land

asked by on

I noticed a month and a half ago that my vehicle has been having performance issues while trying to go uphill. I checked with several mechanics about what could cause it and I've done everything that they have told me to do, from changing spark and wires to changing the radiator and cooling fans to even replacing transmission fluid and filter. When I went to AutoZone, I had them run a diagnostic computer test on the van and got 14 cides, most of which were minor, but the two big ones were for an oxygen sensor and the EGR valve (code P0401) so I ordered the EGR valve, which the guy who works there said would solve this problem. I've spent several hundred dollars and lots of hours working on this and need my vehicle at peak performance again. I just don't want to spend money and install parts that don't need to be replaced if I can help it. So, will changing the EGR valve solve my problem?

My car has 300751 miles.
My car has an automatic transmission.

Hello. P0401 is the trouble code for insufficient EGR flow. This can occur for a few different reasons, and could be contributing to your performance issues. The EGR, short for exhaust gas re circulation, is a system designed to recirculate exhaust gasses back into the the engine in order to reduce N0x type emissions. Insufficient flow can be caused by a faulty EGR valve, however usually a faulty EGR valve will produce it’s own trouble code. Insufficient flow can also be caused by an obstruction or leak in the EGR system piping, which is not an uncommon occurrence. 14 trouble codes indicate that there is likely several issues present with the vehicle. I would recommend having a professional technician, such as one from YourMechanic, come to your location to determine if the EGR valve needs to be replaced, and what other repairs may be needed.

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!
  1. Home
  2. Questions
  3. Loss of power going uphill and acceleration issues on flat land

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: I changed the plugs and plug wires and changed oil on my van and now it won't start

If you correctly installed the plug wires, gaped the plugs correctly and didn't move the distributor cap which adjusted the timing, there should be no reason why the above maintenance is now causing the car not to start. It might...

Q: Engine light still on after replacing the gas cap

This is a simple fix. Replace the fuel cap. The cap sometimes does not reseal after refueling causing the system to detect a leak. Make sure the cap is sealing after you refuel and make sure the vehicle is turned...

Q: My water pump leaks and shoots out water

If the water pump is leaking coolant through the weep hole, the water pump has failed. The best way to resolve this issue is to have the water pump replaced by a certified professional. After the water pump has been...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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...