P0408 Dodge Code - Exhaust Gas Recirculation Sensor 'B' Circuit High
Quick Answer
Early Exhaust Gas Recirculation (EGR) systems components include an EGR Valve, an Engine Control Module (ECΜ) Controlled Vacuum Switch Valve or EGR Solenoid, and an EGR Vacuum Modulator. Common causes include Faulty EGR volume control solenoid valve, Carbon built up on EGR valve, EGR volume control solenoid valve harness is open or shorted. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
- What it means
- P0408 Dodge indicates Exhaust Gas Recirculation Sensor 'B' Circuit High.
- Common causes
- Common causes include Faulty EGR volume control solenoid valve, Carbon built up on EGR valve, EGR volume control solenoid valve harness is open or shorted.
- Severity
- Moderate - service should be scheduled soon.
- Can I drive?
- The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
Code P0408 Dodge Description
The EGR system on recently built vehicles uses a step motor to control the flow rate of EGR from the exhaust manifold. This motor has four winding phases. It operates according to the output pulse signal of the ECΜ. Two windings are turned ON and OFF in sequence. Each time an ON pulse is issued, the valve opens or closes, changing the flow rate. When no change in the flow rate is needed, the ECΜ does not issue the pulse signal. Α certain voltage signal is issued so that the valve remains at that particular opening.
What are the Possible Causes of the DTC P0408 Dodge?
- Faulty EGR volume control solenoid valve
- Carbon built up on EGR valve
- EGR volume control solenoid valve harness is open or shorted
- EGR volume control solenoid valve circuit poor electrical connection
- Faulty EGR temperature sensor and circuit
How to Fix the DTC P0408 Dodge?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0408 Dodge code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0408 Dodge Code
1. What does the OBDII code P0408 mean on a Dodge vehicle?
The P0408 code indicates a problem with the Exhaust Gas Recirculation (EGR) Sensor ‘B’ Circuit, specifically that the sensor is reading a voltage or signal higher than expected.
2. What are the common symptoms of the P0408 code on a Dodge?
Symptoms may include the Check Engine Light illuminated, rough idling, reduced fuel efficiency, stalling, or hesitation during acceleration.
3. What causes the P0408 code to appear?
Common causes include a faulty EGR position sensor, wiring issues such as damaged or corroded connections, a malfunctioning EGR valve, or a problem with the vehicle's Powertrain Control Module (PCM).
4. Can I drive my Dodge with a P0408 code?
While the vehicle may remain drivable, ignoring the code could lead to reduced engine performance, higher emissions, and potential damage to other components over time.
5. How do you diagnose the P0408 code on a Dodge?
Diagnosis typically involves using a scan tool to read live data, visually inspecting the EGR sensor and wiring, testing the sensor’s voltage with a multimeter, and checking the EGR valve for proper function.
6. How can I fix the P0408 code on my Dodge?
Potential fixes include replacing the faulty EGR position sensor, repairing or replacing damaged wiring, cleaning or replacing the EGR valve, or reprogramming or replacing the PCM if necessary.
7. How much does it cost to repair a P0408 code on a Dodge?
Repair costs vary depending on the issue, ranging from $100–$300 for sensor or wiring repairs to $400–$800 if the EGR valve or PCM needs replacement.
8. Can a dirty EGR valve cause the P0408 code?
Yes, a dirty or clogged EGR valve can restrict proper function, potentially causing the sensor to send incorrect signals and triggering the P0408 code.
9. Is the P0408 code specific to Dodge vehicles?
No, the P0408 code is a generic OBDII code that can appear on any vehicle, but the exact symptoms and causes can vary depending on the make and model.
10. Will clearing the P0408 code fix the issue?
Clearing the code will turn off the Check Engine Light temporarily, but the underlying issue must be addressed to prevent the code from reappearing.
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