How does a mechanic diagnose the p0404 trouble code?

The Check Engine Light will be illuminated and the code is set in ECM memory. The engine may have pre-ignition on acceleration. The engine EGR system can cause the engine to run rough, hesitate or even stall if it is not indicating the proper EGR valve position to the ECM. How does a mechanic diagnose the P0404 code?

What does p0404 mean on an EGR valve?

Code P0404 usually indicates that there is a carbon build-up somewhere in the lines, or on other occasions, a bad EGR valve. Increased nitrogen oxide emission may indicate a failing EGR valve.

Is the p0404 valve on my Malibu gone?

I have a 2002 Chevy Malibu LS with the 3.1L V6 engine. I had a p0404 code and when I did my tune-up recently, I went ahead and replaced the EGR valve. However, after two days of normal driving (approx. 70mi each day), the code has not gone away.

What is the p0404 exhaust gas recirculation circuit range?

Hello, I have a 1998 Sonoma SLS 4.3 auto, 4×4 with 150,000kms, I have been recently been having issues with the truck surging, revving up & down slightly & is very sluggish. I put it on a 3130 scanner & the code that came up was P0404 Exhaust Gas Recirculation Control Circuit Range Per…

What does p0404 OBD code mean?

OBD-II Code P0404 is defined as a Exhaust Gas Recirculation Circuit Range/Performance NOx gases, which cause acid rain and respiratory problems, are formed when the engine’s combustion temperature is too high (2500° F). EGR systems are used to reduce the combustion temperature, thus reducing NOx formation. Aug 12 2019

Why do I keep getting code p0402?

Excessive Vacuum signal or Electrical signal to the EGR Valve
The EGR Valve is defective and is opening too far or not properly closing
Malfunctioning EGR Vacuum supply solenoid

What does code p0402 mean?

What the P0402 code means. P0402 is an OBD-II generic code that the engine control module (ECM) has detected indicating the engine exhaust gas recirculation ( EGR ) valve is flowing too much recirculated exhaust gases when it is commanded to open the flow of gases into the intake manifold.

What is trouble code p0406?

P0406 code definition. P0406 is a general ODB2 trouble code indicating a fault within the exhaust gas recirculation EGR circuit.

What are the P codes for mechanical fault?

P0016 Crankshaft position/camshaft position, bank 1 sensor A -correlation Wiring, CKP sensor, CMP sensor, mechanical fault P0017 Crankshaft position/camshaft position, bank 1 sensor B -correlation Wiring, CKP sensor, CMP sensor, mechanical fault

What is the p code for camshaft position?

Camshaft position (CMP) actuator, intake/left/front, bank 1 circuit malfunction Wiring, CMP actuator, ECM P0011 Camshaft position (CMP), intake/left/front, bank 1 timing over advanced/system performance Valve timing, engine mechanical fault, CMP actuator P0012 Camshaft position (CMP), intake/left/front, bank 1 timing over -retarded

What is the p code for a fuel volume regulator?

P0001 Fuel volume regulator control -circuit open Wiring, regulator control solenoid P0002 Fuel volume regulator control -circuit range/performance Wiring, regulator control solenoid P0003 Fuel volume regulator control -circuit low Wiring short to earth, regulator control solenoid P0004

What to do when you get fault code p1408?

This fault code P1408 is an egr (exhaust gas recirculation) valve circuit failure. If you get this fault code, try removing and cleaning the egr valve pintle rod but at the same time, clean the port opening of the egr port where the egr valve is mounted. If possible, clean the passage going downstream from the port up to the throttle body.

What are the common causes of code p1404?

What are the common causes of code P1404? 1 Damaged, burnt, shorted, disconnected, or corroded wiring and/or connectors. 2 Open circuits. 3 Defective EGR valve. 4 Excessive wear of moving parts of the EGR valve. 5 Failed, or failing PCM. Note that this is a rare event, and the fault must be sought elsewhere before any controller is replaced.

What causes the VCM to set the p1404 DTC?

SEVERE OCCURRENCES MAY CAUSE THE VEHICLE CONTROL MODULE (VCM) TO SET A P1404 DTC BECAUSE THE VCM PERCEIVES THAT THE EGR VALVE IS STUCK OPEN. 1. USING THE TECH 2 SCAN TOOL, EXERCISE THE EGR VALVE, AND VERIFY THE [EGR] VALVE’S ACTUAL AND DESIRED POSITION TRACK.

Can a vehicle set a false OBD II DTC p1404?

SOME VEHICLES MAY SET A FALSE OBD II DTC P1404. ELECTRONIC NOISE IN THE VEHICLE MAY CREATE MOMENTARY FALSE “LOW” EXHAUST GAS RECIRCULATION (EGR) PINTLE POSITION FEEDBACK SIGNAL VALUES.

How does a mechanic diagnose the p0404 trouble code?