P0444 Mercedes-Benz Code - Evaporative Emission Control System Purge Control Valve Circuit Open
Quick Answer
The Evaporative Emission System (EVAP) canister purge volume control solenoid valve uses a ON/OFF duty to control the flow rate of fuel vapor from the EVAP canister. Common causes include Faulty Evaporative Emission (EVAP) Purge Solenoid Control, Evaporative Emission (EVAP) Purge Solenoid Control harness is open or shorted, Evaporative Emission (EVAP) Purge Solenoid Control circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
- What it means
- P0444 Mercedes-Benz indicates Evaporative Emission Control System Purge Control Valve Circuit Open.
- Common causes
- Common causes include Faulty Evaporative Emission (EVAP) Purge Solenoid Control, Evaporative Emission (EVAP) Purge Solenoid Control harness is open or shorted, Evaporative Emission (EVAP) Purge Solenoid Control circuit poor electrical connection.
- Severity
- Low - monitor the vehicle and repair when practical.
- Can I drive?
- The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
Code P0444 Mercedes-Benz Description
What are the Possible Causes of the DTC P0444 Mercedes-Benz?
- Faulty Evaporative Emission (EVAP) Purge Solenoid Control
- Evaporative Emission (EVAP) Purge Solenoid Control harness is open or shorted
- Evaporative Emission (EVAP) Purge Solenoid Control circuit poor electrical connection
How to Fix the DTC P0444 Mercedes-Benz?
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 P0444 Mercedes-Benz 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 P0444 Mercedes-Benz code?
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Frequently Asked Questions about P0444 Mercedes-Benz Code
1. What are common symptoms of OBDII code P0444 in a Mercedes-Benz related to the evaporative emission control system purge control valve circuit open?
The common symptoms include rough idling, decreased fuel efficiency, and the illumination of the check engine light.
2. What are the possible causes of the OBDII code P0444 in a Mercedes-Benz?
The code P0444 in a Mercedes-Benz is typically caused by a faulty purge control valve, damaged wiring or connectors in the circuit, or a problem with the engine control module (ECM).
3. How can I diagnose the issue causing OBDII code P0444 in my Mercedes-Benz?
Diagnosing the issue involves checking the purge control valve for proper functionality, inspecting the wiring and connectors for any damage, and using a scan tool to read the codes and monitor the system.
4. Can I continue driving my Mercedes-Benz with OBDII code P0444?
It is not recommended to continue driving with the code P0444 illuminated, as it can lead to other issues and potentially affect the performance of your vehicle.
5. How can I repair OBDII code P0444 in my Mercedes-Benz?
Repairing the code P0444 may involve replacing the purge control valve, repairing or replacing damaged wiring or connectors, or resetting the ECM after fixing the underlying issue.
6. Are there any DIY tips for troubleshooting OBDII code P0444 in a Mercedes-Benz?
You can start by checking the purge control valve for proper operation, inspecting the wiring and connectors for damage, and clearing the code with a scan tool to see if it returns.
7. How much does it cost to fix OBDII code P0444 in a Mercedes-Benz at a dealership or repair shop?
The cost of fixing the code P0444 can vary depending on the exact cause of the issue, but it typically ranges from $100 to $300 for parts and labor.
8. Can a Mercedes-Benz owner reset OBDII code P0444 without visiting a mechanic?
Yes, Mercedes-Benz owners can reset the code P0444 using an OBDII scan tool or by disconnecting the car's battery for a few minutes to clear the ECM memory.
9. What is the importance of fixing OBDII code P0444 in a Mercedes-Benz promptly?
Fixing the code P0444 promptly is important to ensure proper functioning of the evaporative emission control system, prevent further damage to the engine, and maintain optimal fuel efficiency.
10. How often does OBDII code P0444 occur in Mercedes-Benz vehicles?
OBDII code P0444 related to the evaporative emission control system purge control valve circuit open can occur sporadically in Mercedes-Benz vehicles, especially in older models or those with high mileage.
Discuss the causes and fixes for P0444 Mercedes-Benz OBDII Code
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Po444 problem: 2005 Mercedes c240 4matic with 144K miles: runs fine when gas tank is full; when tank level drops a bit, a code p0444 and CEL come on; also; severe hesitation; gas pedal needs to be slowly pushed to obtain road speed but then runs fine until next stop when hesitation problem reoccurs. Replaced the evap emissions purge control valve solenoid in engine compartment; no change; replaced the vent canister and solenoid near gas tank; no change; believe that the fuel sensor or fuel pump may be the problem as the problem disappears if the gas tank is full; thoughts???
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