Ford Code P040B is a diagnostic trouble code (DTC) indicating an issue with the exhaust gas recirculation temperature (EGRT) Sensor A Circuit Range/Performance. This code is often caused by damaged components, such as the EGRT11 (Transit) or the EGRT12 (all others) temperature sensors. When the change in the EGRT11 or the EGRT12 is less than or greater than a calibrated threshold, an increment counter advances for that drive cycle. The presence of this DTC may indicate that the vehicle is operating in derate mode and may experience a loss of power. This issue can be solved by replacing the damaged components and driving until the system warning message is cleared from the instrument cluster message center.
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Causes and Solutions for Ford Code P040B
| Cause | Solution |
|---|---|
| Damaged EGRT11 sensor (Transit) | Replace the EGRT11 sensor |
| Damaged EGRT12 sensor (all others) | Replace the EGRT12 sensor |
| Vehicle operating in derate mode | Drive the vehicle until the system warning message is cleared from the instrument cluster message center |
| Loss of power | Replace damaged components |
Examining the EGRT Sensors
Ford Code P040B is set when the exhaust gas recirculation temperature (EGRT) Sensor A Circuit Range/Performance has an issue. This code is caused by damaged components, such as the EGRT11 (Transit) or the EGRT12 (all others) temperature sensors. The EGRT11 and EGRT12 sensors detect the temperature of the exhaust gas recirculation stream. When the change in the EGRT11 or the EGRT12 is less than or greater than a calibrated threshold, an increment counter advances for that drive cycle.
Derate Mode and Loss of Power
The vehicle will enter derate mode when the EGRT11 and EGRT12 sensors detect an issue. Derate mode is where the vehicle operates at reduced power to protect the engine from damage. In this mode, the vehicle may experience a loss of power. A warning message may also appear in the instrument cluster message center.
Solution for Ford Code P040B
The damaged components must be replaced to solve the issue of Ford Code P040B. This can be done by replacing the EGRT11 (Transit) and/or the EGRT12 (all others) temperature sensors. After the components are replaced, the vehicle must be driven until the system warning message is cleared from the instrument cluster message center.
Conclusion: Solving Ford Code P040B
Ford Code P040B is a diagnostic trouble code that indicates an issue with the EGRT11 or EGRT12 sensors. The cause of the code can be attributed to damaged components, such as the EGRT11 (Transit) or the EGRT12 (all others) temperature sensors. The solution for this code is to replace the damaged components and drive the vehicle until the system warning message is cleared from the instrument cluster message center. By following these steps, Ford Code P040B can be solved.