OBD code P0402 indicates an issue with the Exhaust Gas Recirculation (EGR) system.
Symptoms include the Engine Light ON, engine hesitation.
The causes can be a stuck open EGR volume control valve, faulty EGR components, or wiring issues.
While not a critical issue, it can affect vehicle performance.
To fix, inspect and repair the EGR components and related wiring carefully.
| Repair Importance Level | 6.67 (Out of 10) |
| Estimated Repair Time | Approximately 1.0 hour |
| Repair Difficulty Level | 6.67 (Out of 10) |
Symptoms of the p0402 OBD Code
The vehicle may experience reduced engine performance and increased fuel consumption with fault code P0402.
- Symptoms: Engine Light ON.
- Engine hesitation.
Causes of the p0402 OBD Code
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Excessive EGR flow can trigger fault code P0402.
- P0402 can be caused by the EGR volume control valve stuck open.
- A faulty EGR volume control valve.
- An open or shorted EGR solenoid valve harness.
- Poor electrical connection in the EGR solenoid valve circuit.
- A faulty EGR temperature sensor and circuit.
Fixing Error Code p0402 Step By Step
To address fault code P0402, inspect and clean the EGR valve and passages for carbon buildup.
- To fix OBDII code P0402, first, review the ‘Possible Causes’ mentioned above and visually examine the corresponding wiring harness and connectors.
- Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
- Next, check the EGR valve for proper operation and carbon buildup.
- Clean or replace the EGR valve as necessary.
- Then, inspect the EGR vacuum modulator for any faults and replace if needed.
- Finally, clear the fault code using a scan tool and test drive the vehicle to ensure the code does not return.
Cost Of Fixing p0402 Fault Code
Diagnosing and repairing fault code P0402 may involve inspecting and cleaning the EGR system components.
The cost to diagnose and fix OBD code P0402 depends on the estimated 1. 0hour repair time.
Labor rates range from $75 to $150 per hour.
The total cost will vary based on shop rates, complexity of the issue, and any additional parts or services needed.
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Details of the p0402 OBD Code
P0402 indicates excessive EGR flow detected by the PCM in the exhaust gas recirculation system.
OBD code P0402 means that there is excessive EGR flow detected.
This code is triggered by the Engine Control Module (ECM) when it detects that the actual flow of Exhaust Gas Recirculation (EGR) is higher than commanded.
The EGR system is responsible for recirculating a portion of the engine’s exhaust gas back into the intake manifold to reduce combustion temperatures and decrease the formation of nitrogen oxides (NOx).
When P0402 is set, it indicates that there is an issue with the EGR system, such as a stuck open EGR valve, a clogged EGR passage, or a faulty EGR position sensor.
Mechanic’s Tech Notes
Code P0402 indicates excessive EGR flow detected by the ECM, potentially caused by a faulty EGR valve or clogged passages.
To diagnose and fix OBDII code P0402, start by checking the EGR valve for proper operation and carbon buildup.
Use a voltmeter to test the EGR position sensor and ensure it’s within specifications.
Inspect the EGR system for leaks or clogs.
Verify the EGR solenoid’s operation using a scan tool to command it on and off.
Check the wiring harness and connectors for any damage or corrosion.
Clean or replace components as needed.
Reset the code and test drive the vehicle to ensure the issue is resolved.
FAQ
Common symptoms of OBD code P0402 include Engine Light ON, engine hesitation. Causes may be EGR volume control valve issues. Fix involves inspecting wiring and components.
The typical cause of OBD code P0402 is a stuck open EGR volume control valve, faulty EGR valve, or issues with the EGR solenoid valve circuit.
Diagnose and repair OBD code P0402 by checking EGR volume control valve, solenoid valve, harness, and connectors for issues. Inspect wiring for damage or corrosion.
Wrap Up
If your check engine light is on and you’re experiencing poor engine performance, you may be dealing with OBDII code P0402. This code typically indicates an issue with the Exhaust Gas Recirculation (EGR) system, such as a faulty EGR valve, clogged EGR passages, or a malfunctioning EGR position sensor.
To address OBDII code P0402, start by inspecting the EGR valve and its associated wiring for any signs of damage or corrosion.
Check for carbon buildup in the EGR passages and ensure proper EGR valve operation.
Test the E
