P0405 Code - Exhaust Gas Recirculation Sensor 'A' Circuit Low
Quick Answer
Early Exhaust Gas Recirculation (EGR) systems component's include and EGR Valve, and Engine Control Μodule (ECΜ) Controlled Vacuum Switch Valve or EGR Solenoid and an EGR Vacuum Μodulator. 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
- P0405 indicates Exhaust Gas Recirculation Sensor 'A' Circuit Low.
- 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 P0405 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 P0405?
- 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 P0405?
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 P0405 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.
Need more information about the P0405 code?
Need more information on how to fix the P0405 code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0405 code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- P0405 Buick — Exhaust Gas Recirculation Position Sensor Circuit Low Voltage
- P0405 Cadillac — Exhaust Gas Recirculation Position Sensor Circuit Low Voltage
- P0405 Chevrolet — Exhaust Gas Recirculation Position Sensor Circuit Low Voltage
- P0405 Chrysler — Exhaust Gas Recirculation Position Sensor Circuit Low
- P0405 Dodge — Exhaust Gas Recirculation Position Sensor Circuit Low
- P0405 Ford — Exhaust Gas Recirculation Sensor 'A' Circuit Low
- P0405 GMC — Exhaust Gas Recirculation Position Sensor Circuit Low Voltage
- P0405 Infiniti — Exhaust Gas Recirculation Temperature Sensor Circuit Low Input
- P0405 Isuzu — Exhaust Gas Recirculation Position Sensor Circuit Low Voltage
- P0405 Jeep — Exhaust Gas Recirculation Position Sensor Circuit Low
- P0405 Lincoln — Exhaust Gas Recirculation Sensor 'A' Circuit Low
- P0405 Mazda — Exhaust Gas Recirculation Sensor 'A' Circuit Low
- P0405 Mercedes-Benz — Exhaust Gas Recirculation Sensor 'A' Circuit Low
- P0405 Mercury — Exhaust Gas Recirculation Sensor 'A' Circuit Low
- P0405 Mitsubishi — Exhaust Gas Recirculation Position Sensor Circuit Low
- P0405 Nissan — Exhaust Gas Recirculation Temperature Sensor Circuit Low Input
- P0405 Pontiac — Exhaust Gas Recirculation Position Sensor Circuit Low Voltage
- P0405 Saturn — Exhaust Gas Recirculation Position Sensor Circuit Low Voltage
Frequently Asked Questions about P0405 Code
1. What are the common symptoms of OBDII code P0405 (Exhaust Gas Recirculation Sensor 'A' Circuit Low)?
- Common symptoms include rough idling, engine hesitation, decreased fuel efficiency, and the illumination of the Check Engine Light.
2. What are the possible causes of OBDII code P0405?
- The code P0405 can be caused by a faulty EGR sensor, damaged wiring or connectors in the EGR system, or a problem with the EGR valve itself.
3. How can I diagnose the cause of OBDII code P0405?
- Diagnosing the issue involves checking the EGR sensor for proper voltage, inspecting the wiring for any damage, and testing the EGR valve for functionality using a multimeter.
4. Can a dirty EGR system cause code P0405?
- Yes, a dirty or clogged EGR system can cause insufficient flow and trigger code P0405. Regular maintenance and cleaning of the EGR system can help prevent this issue.
5. What are the potential risks of ignoring OBDII code P0405?
- Ignoring code P0405 can lead to poor engine performance, increased emissions, and potential damage to other engine components over time.
6. How can I repair OBDII code P0405 at home?
- Home repair options include cleaning the EGR valve, checking and cleaning the EGR passages, and inspecting the wiring and connections for any visible issues.
7. Is it safe to drive with OBDII code P0405 present?
- It is generally safe to drive with code P0405, but it is recommended to address the issue promptly to prevent further damage and ensure optimal engine performance.
8. Can code P0405 be triggered by a loose gas cap?
- No, code P0405 specifically relates to the Exhaust Gas Recirculation system and is not related to issues with the gas cap.
9. Will resetting the Check Engine Light resolve code P0405?
- Resetting the Check Engine Light may temporarily turn off the warning, but if the underlying issue causing code P0405 is not addressed, the light is likely to come back on.
10. How can a mechanic further diagnose and repair OBDII code P0405?
- A mechanic may use specialized diagnostic tools to pinpoint the exact cause of the issue, perform thorough testing of the EGR system components, and replace any faulty parts as needed.
Discuss the causes and fixes for P0405 OBDII Code
-
do you solve this problem?
Engine is CFWA ?
Please tell me how to fix that problem.
Thanks
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
