When a Chevrolet vehicle throws a P1404 code, it typically indicates an issue with the Exhaust Gas Recirculation (EGR) Solenoid 2 control circuit. This code is triggered when the engine is started, the engine coolant temperature sensor is more than 183°F, the vehicle is driven in either 1st or 2nd gear at an engine speed of 1000-1488 rpm, the vehicle is in coast-down mode, the HO2S signal is over 566mV, the A/C clutch is off, and the Powertrain Control Module (PCM) detects the engine is no longer in the closed loop mode. There are two primary causes for this code to be thrown: either the EGR tube is clogged or restricted, or the EGR Solenoid 2 control circuit is open or shorted to ground.
Causes and Solutions for a Chevrolet P1404 Code
| Cause | Solution |
|---|---|
| EGR tube is clogged or restricted | Cleaning the EGR tube and/or replacing the EGR valve |
| EGR Solenoid 2 control circuit is open or shorted to ground | Checking the wiring and connectors, and replacing the EGR Solenoid 2 control circuit |
| Engine coolant temperature sensor is malfunctioning | Replacing the engine coolant temperature sensor |
| HO2S signal is inaccurate | Testing and replacing the HO2S signal as needed |
EGR Tube Clogged or Restricted
When the EGR tube is clogged or restricted, it can cause the engine to run too rich and trigger the P1404 code. To fix this issue, the EGR tube must be cleaned and/or the EGR valve must be replaced.
EGR Solenoid 2 Control Circuit
The EGR Solenoid 2 control circuit could be open or shorted to ground, causing the P1404 code to be thrown. To resolve this issue, the wiring and connectors must be checked and the EGR Solenoid 2 control circuit must be replaced if necessary.
Engine Coolant Temperature Sensor
A malfunctioning engine coolant temperature sensor can also trigger the P1404 code. To fix this issue, the engine coolant temperature sensor must be replaced.
HO2S Signal
If the HO2S signal is inaccurate, it will cause the P1404 code to be thrown. To fix this issue, the HO2S signal must be tested and replaced as needed.
Conclusion
When a Chevrolet vehicle throws a P1404 Code, the causes can range from a clogged or restricted EGR tube, an open or shorted EGR Solenoid 2 control circuit, a malfunctioning engine coolant temperature sensor, or an inaccurate HO2S signal. To resolve these issues, the appropriate action must be taken, such as cleaning the EGR tube, replacing the EGR valve, checking the wiring and connectors, replacing the EGR Solenoid 2 control circuit, replacing the engine coolant temperature sensor, and testing and replacing the HO2S signal as needed.
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