P20A3 Code - Reductant Purge Control Valve Circuit High
Quick Answer
In order to reverse the reductant flow direction (for line purge) a 4-2-way valve (reverting valve) needs to be switched. Common causes include Faulty Reductant Purge Control Valve, Reductant Purge Control Valve harness is open or shorted, Reductant Purge Control Valve circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P20A3 indicates Reductant Purge Control Valve Circuit High.
- Common causes
- Common causes include Faulty Reductant Purge Control Valve, Reductant Purge Control Valve harness is open or shorted, Reductant Purge Control Valve circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P20A3 Description
The reverting valve functional check monitors the pressure drop when the purge cycle is started. To run this test the pressure level must exceed a calibration threshold (280 kPa) at beginning of test. For a successful test result, the pressure must drop by another threshold (230 kPa) within the time.
If the test is not successfully passed the purge cycle will be terminated immediately because of the risk of uncontrolled injection of reductant into the exhaust pipe.
What are the Possible Causes of the DTC P20A3?
- Faulty Reductant Purge Control Valve
- Reductant Purge Control Valve harness is open or shorted
- Reductant Purge Control Valve circuit poor electrical connection
How to Fix the DTC P20A3?
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 P20A3 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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Information for Specific Makes
- P20A3 Ford — Reductant Purge Control Valve Circuit High
Frequently Asked Questions about P20A3 Code
1. What are the common symptoms of OBDII code P20A3 (Reductant Purge Control Valve Circuit High)?
The common symptoms include the Check Engine light coming on, reduced engine performance, increased fuel consumption, and potential issues with the urea injection system in diesel vehicles.
2. What are the possible causes of OBDII code P20A3?
Possible causes of this code include a faulty reductant purge control valve, wiring or connection issues in the control circuit, a malfunctioning powertrain control module (PCM), or a software glitch in the system.
3. How can I diagnose the cause of OBDII code P20A3?
Diagnosing this code typically involves using a scan tool to retrieve the code and then performing a thorough inspection of the reductant purge control valve, its wiring, and connections. Testing the control valve's functionality and checking for any related issues in the system are also crucial steps.
4. Can I continue driving with OBDII code P20A3 active?
It is not recommended to ignore this code and continue driving for an extended period. While the vehicle may still be operable, the underlying issue causing the code could potentially lead to more significant problems if left unresolved.
5. How can I repair OBDII code P20A3?
Repairing this code often involves replacing the faulty reductant purge control valve, addressing any wiring or connection issues, and clearing the code with a scan tool. In some cases, reprogramming the PCM may also be necessary.
6. Is OBDII code P20A3 a serious issue?
While the code itself may not cause immediate harm to the vehicle, it is essential to address it promptly to prevent any potential damage to the reductant injection system and ensure optimal engine performance.
7. Can a DIY enthusiast fix OBDII code P20A3 at home?
Depending on their skill level and access to tools, a DIY enthusiast may be able to address this code at home by following repair guides and procedures. However, complex electrical issues or system calibrations may require professional assistance.
8. What role does the reductant purge control valve play in the vehicle's emissions system?
The reductant purge control valve regulates the flow of reductant (such as diesel exhaust fluid) into the emissions system to reduce harmful emissions. A malfunctioning valve can lead to increased pollution and decreased engine efficiency.
9. Will OBDII code P20A3 cause my vehicle to fail an emissions test?
Yes, if this code is active during an emissions test, it will likely cause your vehicle to fail. It is essential to address the underlying issue and clear the code before attempting to pass an emissions inspection.
10. How can I prevent OBDII code P20A3 from recurring in the future?
Regular maintenance, including checking and cleaning the reductant purge control valve, inspecting wiring for damage, and ensuring proper fluid levels in the emissions system, can help prevent the recurrence of this code.
Discuss the causes and fixes for P20A3 OBDII Code
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