Skip the auto shop - Our mechanics make house calls

Q: Trying to diagnose a po405 Low Signal circuit voltage to egr. Everything working fine but code will not go away??

asked by on

Tried diagnosing without any luck finding problem

My car has 125000 miles.
My car has an automatic transmission.

Hi there. P0405 is an OBD-II generic code that the engine control module (ECM) detected the engine exhaust gas recirculation (EGR) sensor has went below its specification range. A short to ground of the sensor input to the ECM. You might want to read this article as it will give you several tips on how to diagnose the problem and root source.

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!
  • Home
  • Questions
  • Trying to diagnose a po405 Low Signal circuit voltage to egr. Everything working fine but code will not go away??

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: Key stuck in ignition of 2012 Chevrolet Impala

There is a common problem with this vehicles wiring harness that connects to the shifter. One of the wires has broke and lost its connection and will not engage the ignition release solenoid. I would recommend having a technician from...

Q: Overheating - new radiator water pump thermostat sensor relay switch. Coolant was flushed 3 wks ago and its now purple 1995 Chevy Camaro

Hello - purple coolant is only used in large diesel engines, or an additive called "Purple Ice", which is a "wetting" agent - enhances heat transfer in engines. Despite all the new parts, the real cause of your overheating hasn't...

Q: The back of the car bounces up and down like springs are broken off

Hello, thank you for writing in. The suspension components are intertwined with the vehicle's wheel assemblies and the steering components. Start with the simplest tests and work your way to the more complex possibilities. Start by performing a bounce test....

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.