Q: CODE;EGR LOW FLOW

asked by on

2003 PONTIAC MONTANA W/3.4 REPLACED EGR VALVE WITH NEW DURALAST/ AUTOZONE ONE. LESS THAN 300 MILES LATER SAME FAULT CODE:" EGR-LOW FLOW" .JUST PULLED OFF NEW EGR VALVE AND BLEW COMPRESSED AIR DOWN FEED PIPE TO MANIFOLD WITH NO RESTRICTIONS. IDEAS ANYONE???

My car has 160000 miles.
My car has an automatic transmission.

Typically, on this engine there will be a blockage, consisting of hard packed carbon, in the passageway in the plenum. It can be very difficult to clean out those passageways on the vehicle without removing the aluminum plenum for a thorough inspection. I have also seen the valve fail sequentially so it would not surprise me if the "newer" valve tests bad. You can test it on or off the vehicle. If you actuate (open) the valve at idle and there is no engine stumbling, that means the valve is not functional and/or the passageway through the plenum is blocked. I would first test the valve (replace as necessary) and thoroughly clean the plenum and see if that resolves it. Other causes of Diagnostic Trouble Code P0401 include a vacuum restriction to the MAP sensor, excessive back pressure in the exhaust system, any cause of low engine vacuum, and exhaust system leaks. If you want this issued diagnosed by a certified mechanic, dispatched by YourMechanic right to your location, please request an EGR system diagnostic/valve inspection and the responding certified mechanic will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. CODE;EGR LOW FLOW

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: Back window decal

Generally most states prohibit items in the windows that obstruct the view of the driver. Depending on specifically where on the back window the decal is placed it may or may not be illegal. You will need to check with...

Q: Q: Car won't start, fuel gauge and speedometer malfunctioning

Hello there, the first place I would look, with all of the symptoms you've described, is into the no start condition. The most likely cause of a no start would be a problem with the battery, starter, ignition switch, fuel...

Q: P0405 EGR Sensor A Circuit Low

Hello and thank you for your question. With having 200,000 miles on the engine, I recommend replacing the EGR and not just cleaning it. The plunger is probably has too much carbon build up making the EGR stick open when...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...
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...