What is the P0404 fault number? What is the Exhaust Gas recirculation circuit range/performance failure description? How do I fix the P0404 fault code What are the causes and symptoms of the P0404 error code?
What is the P0404 fault code? What does it signify?
The fault code P0404 will be activated if the powertrain control module (PCM/ECM), detects an issue with Exhaust Gas Recirculation valve performance. This is when the EGR valve/sensor is not operating according to the manufacturer’s specifications.
EGR (Exhaust Gas Recirculation), which is a system that directs exhaust gas into cylinders to re-burn, serves one purpose. This reduces the temperature of the cylinders, which in turn lowers NOX (nitrogen oxide) emissions. The system regulates the exhaust flow back to the cylinder using a valve. The P0404 code refers to a vehicle with an electrically controlled EGR vale, rather than a vacuum-controlled EGR valve. The PCM monitors the valve and transmits information such as whether it is closed, partially closed, or open. This code is set when the PCM receives an open signal from the feedback circuit. (or vice versa)
Related EGR fault codes are: P0400,P0401,P0403,P0405,P0406,P0406,P0405,P0406,P0406,P0405,P0406,P0406,P0406,P0406,P0407,P0406,P0407,P0406,P0408,P0406,P0406,P0407,P0407,P0408,P0408,P040808,P0408088, P04088, P04080808 &P0409091a140808 &P0407080808 P04090924609092400…
What Are the Possible Causes of P0404 Fault Codes?
P0404 indicates either carbon buildup in the lines, or a damaged EGR valve. Carbon buildup can happen naturally over time. It is impossible to stop this from happening, but it is possible to catch the problem early.
- – Defective EGR valve
- – Defective EGR sensor
- Problems with EGR sensor wiring or connectors
- – Carbon buildup at the EGR valve
- – Low Probability Defective PCM
What are the symptoms of P0404 Malfunction code?
Sometimes there might not be any symptoms except the check engine lamp. The EGR valve could become blocked or prevented completely from opening or closing if it is subject to excessive carbon buildup.
Engine performance may suffer if the valve fails.
- Illumination of the check engine light
- – Idle irregularity
- – Knocking noises due to premature ignition during acceleration
- – Engine is not functioning properly, hesitating, or even stalling
- – Increased fuel consumption
- – Increased NOx (This can prevent you from passing an exhaust emission test).
- – Higher combustion temperatures can lead to engine overheating. This is due to increased fuel consumption.
How to Fix the P0404 Fault Code
- First, clear all codes and then run a road test to check if it returns.
- The connector connections and EGR position sensor cables should be checked. Repairs should be made to loose connector connections.
- The EGR valve should not be opened partially due to excessive carbon buildup. It should be replaced
- If the EGR valve does not send the correct signals to the PCM when manually actuated, then the EGR position sensor must be replaced.
How serious is the P0404 Fault code?
Code P0404 refers to a moderately serious engine warning. It is not easy to identify some symptoms. The EGR system can be completely disabled if this code is triggered. A defective EGR valve can result in serious engine problems and high nitrogen oxide emissions. If the problem is not fixed quickly, it can have devastating consequences for the engine.
