Reference meaning
What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
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A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
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Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Scan worksheet →Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
P1404EGR Close Position Performance
P1404EGR Close Position Performance
P1404EGR Position Sensor Rationality Closed
Manufacturer communications
33Original wording in English
MERCEDES-BENZ
Complaint Check engine light illuminate, or previously on One of the below Exhaust Flap fault codes stored in PTCU N127: P13C273 P13C278 P140473 Cause Various Remedy Model year 2024 254 and 167 with engine M254 -Update software of N127 PTCU. New software: 254- A2549022611 167- A2549022811 -Clear fault codes and check operation o…
RAM
Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P1404 - EGR Close Position Performance. Customers may also comment on one or more of the following: ● Engine tug…
RAM
"Heavy Duty Exhaust Gas Recirculation (EGR) Value Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set the following Diagnostic Trouble Code (DTC): ● P1404 - EGR Position Sensor Rationality Closed This bulletin involves replacing the EGR valve."
RAM
"Heavy Duty Exhaust Gas Recirculation (EGR) Valve Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P1404 - EGR Position Sensor Rationality Closed This bulletin involves replacing the EGR valve."
Check vehicle applicability
147A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Buick | CENTURY ↗ | 2001 |
| Buick | RENDEZVOUS ↗ | 2006 |
| Buick | RENDEZVOUS ↗ | 2005 |
| Buick | TERRAZA ↗ | 2006 |
| Buick | TERRAZA ↗ | 2005 |
| Chevrolet | C SERIES ↗ | 1999 |
| Chevrolet | C SERIES ↗ | 1998 |
| Chevrolet | EQUINOX ↗ | 2006 |
Code meaning and manufacturer information
Original wording in English · Historical directory labels; manufacturer applicability has not been established for every entry.
IAT – B Circuit Malfunction/ Exhaust Gas Recirculation Closed Position Performance
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.