What the P0403 code means. P0403 is an OBD-II generic code that indicates that the engine control module (ECM) has detected the engine exhaust gas recirculation (EGR) circuit has malfunctioned . The ECM detected a short or open circuit in the EGR vacuum control solenoid or wiring to the solenoid.
What can trigger an EGR code?
- A failing DPFE sensor.
- Restricted or clogged EGR tubes.
- A clogged catalytic converter.
- Carbon buildup on the EGR temperature sensor.
- Faulty or lack of vacuum supply to the EGR.
- Electrical problems with the EGR circuit.
- Problems with the engine computer.
What does exhaust gas recirculation control circuit mean?
The exhaust gas recirculation (EGR) system helps minimize nitrogen oxide gases coming from your vehicle’s exhaust . ... The ECM/PCM detects an open circuit condition of an EGR motor control circuit for greater than 3 seconds.
What is EGR circuit fault?
A faulty EGR valve can cause problems with the flow and operation of the EGR system leading to performance issues including a reduction in power, reduced acceleration and decreased fuel efficiency. ... EGR valves can become stuck ‘open’ or ‘closed’ due to a build-up of soot particles, carbon deposits and dirt from fuel.
Can the EGR valve cause starting problems?
The exhaust gas recirculation (EGR) valve introduces a measured amount of exhaust gases; into the intake manifold to get re-burned. ... But, the valve can fail and stick either open or closed . When the valve sticks open it may prevent your engine from starting.
What causes code P0405?
Code P0405 is triggered when the EGR position is below the ECM expected sensor position and the most common cause is the EGR sensor has an open circuit internally.
How do you fix the engine code P0404?
- Replacing the EGR valve if it stuck partly open from carbon buildup in the pintle area and cannot be cleaned.
- Replacing the EGR position sensor if it is determined that it cannot give a correct input reading to the ECM when moved manually.
Can I drive with a bad EGR valve?
Can I drive with a bad EGR valve? Technically, you can drive your vehicle with a bad EGR valve , but your vehicle will run rough, shake at idle, and a check engine light will be illuminated. You might also hear popping sounds while driving down the road.
How do I fix my EGR code?
- Replacing the leaking or clogged EGR valve.
- Replacing a broken vacuum line to the EGR valve or control solenoid.
- Replacing an EGR temperature sensor or clean the carbon off of it to repair it if it does not register enough of a temperature change.
How much does it cost to replace the EGR valve?
The average cost for an EGR Valve Replacement is between $314 and $399 but can vary from car to car.
What happens if you unplug EGR valve?
If you unplug it, while the truck is off, then the EGR will stay closed . If the EGR valve is clogged or completely blocked off it can longer re-burn harmful emissions in the combustion chamber. You’re now sending the exhaust gas away from the engine when using an EGR delete kit, which means it begins to run cleaner.
Is it worth cleaning EGR valve?
Cleaning your EGR valve will solve your car’s engine performance issues related to any clogging or system passages problem with the valve. Even more importantly, it’ll prevent serious engine damage and expensive repairs . ... In severe cases, this develops into violent detonations that will seriously damage your engine.
Will a bad EGR valve throw a code?
Question: If I have a bad EGR valve, will it throw a code for a misfire in cylinder number 2? Answer: A bad valve most likely will cause a random misfire since it doesn’t direct exhaust gases to a particular cylinder.
How do I know if my EGR valve is working?
A vacuum-controlled EGR valve is easy to test with a hand-held vacuum pump (see the image). If the EGR valve opens and the vacuum holds for more than a minute , the EGR valve works. If a vacuum diaphragm inside the EGR valve is leaking, the vacuum will drop. Once the vacuum is released, the valve should close fully.
What causes EGR valve failure?
The failure of the EGR valve on the vehicle is not out of the ordinary, as this issue can arise on most modern diesel engines. The failures are usually caused by a build-up of deposits in the EGR valve over a period of time that causes them to stick.
