OBD code P0406 indicates an issue with the Exhaust Gas Recirculation (EGR) system.
Symptoms include the Engine Light ON, engine hesitation.
The cause could be a faulty EGR volume control solenoid valve, carbon buildup on the EGR valve, or wiring issues.
This code should be addressed promptly to prevent potential engine performance issues.
A possible fix involves inspecting and repairing the EGR components and related wiring.
| Repair Importance Level | 6.67 (Out of 10) |
| Estimated Repair Time | Approximately 1.0 hour |
| Repair Difficulty Level | 6.67 (Out of 10) |
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Symptoms of the p0406 OBD Code
The vehicle may experience reduced engine performance and increased fuel consumption with fault code P0406.
- With OBD code P0406, symptoms may include: Engine Light ON.
- Engine hesitation.
Causes of the p0406 OBD Code
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Excessive EGR flow detected due to a faulty EGR valve position sensor or wiring issues.
- P0406 can be caused by a faulty EGR volume control solenoid valve.
- Carbon built up on the EGR valve.
- An open or shorted EGR volume control solenoid valve harness.
- Poor electrical connection in the EGR volume control solenoid valve circuit.
- A faulty EGR temperature sensor and circuit.
Fixing Error Code p0406 Step By Step
Address the EGR position sensor circuit high voltage issue indicated by fault code P0406.
- To fix OBDII code P0406, first, review the possible causes related to the Exhaust Gas Recirculation (EGR) position sensor circuit.
- Visually inspect the wiring harness and connectors for any damage.
- Check the connector pins for signs of being broken, bent, pushed out, or corroded.
- Clean any corrosion found on the connectors.
- Test the EGR position sensor and its circuit for proper operation.
- Replace the EGR position sensor if it fails the test.
- Clear the fault code using a scan tool and test drive the vehicle to verify the repair.
Cost Of Fixing p0406 Fault Code
Diagnosing and repairing fault code P0406 typically involves inspecting and servicing the EGR system components.
The cost to diagnose and fix OBD code P0406 depends on the estimated 1. 0hour repair time.
Labor rates usually range from $75 to $150 per hour, so the general cost could be between $75 and $150. Factors like shop rates and the complexity of the repair can influence the final cost.
Details of the p0406 OBD Code
P0406 indicates an issue with the Exhaust Gas Recirculation Sensor A circuit high.
OBD code P0406 means Exhaust Gas Recirculation Sensor A Circuit High.
This code is triggered when the ECM detects a high voltage condition in the EGR position sensor circuit.
The EGR position sensor is responsible for monitoring the position of the EGR valve to ensure proper exhaust gas recirculation.
When the sensor reports a voltage higher than expected, the ECM sets code P0406.
Mechanic’s Tech Notes
Code P0406 relates to an issue with the Exhaust Gas Recirculation Sensor A circuit high.
To diagnose and fix OBDII code P0406, start by checking the Exhaust Gas Recirculation (EGR) position sensor circuit.
Use a voltmeter to test the sensor’s voltage signal and ground.
Ensure the EGR valve is functioning correctly and not sticking.
Inspect the wiring harness and connectors for any damage or corrosion.
Clear the code and monitor the EGR system while driving to see if the code returns.
If the issue persists, consider replacing the EGR valve or the position sensor.
Remember to follow manufacturerspecific diagnostic procedures for a precise fix.
FAQ
Common symptoms of OBD code P0406 include Engine Light ON, engine hesitation. Causes may be faulty EGR volume control solenoid valve, carbon buildup on EGR valve. Fix: Inspect wiring harness and connectors.
Typical cause of OBD code P0406: Faulty EGR volume control solenoid valve, carbon buildup on EGR valve, open/shorted harness, poor electrical connection, faulty EGR temp sensor.
Diagnose and repair OBD code P0406 by checking EGR volume control solenoid valve, carbon buildup, wiring harness, connectors, and EGR temperature sensor for faults.
Wrap Up
If your check engine light is on and you’re experiencing poor engine performance, you may have OBDII code P0406. This code typically indicates an issue with the Exhaust Gas Recirculation (EGR) position sensor circuit.
Possible causes include a faulty EGR valve position sensor, damaged wiring, or poor electrical connections.
To address OBDII code P0406, start by inspecting the EGR valve position sensor and its wiring harness for any signs of damage or corrosion.
Test the sensor’s resistance and ensure proper voltage supply.
Replace the sensor if necessary and repair any damaged wiring or
