The P202F: Reductant/Regeneration Supply Control Circuit Range/Performance code refers to a malfunction in the reductant (DEF/AdBlue) or regeneration system’s supply control circuit, where its performance is not within the expected range. This could be due to a faulty control circuit, performance issues, or wiring and connector problems.
P202F – Quick Overview
| Code | Information |
|---|---|
| Meaning | P202F: Reductant/Regeneration Supply Control Circuit Range/Performance |
| Is it serious? | Yes, it can impair the vehicle’s ability to effectively reduce NOx emissions and could lead to higher emissions or system failure. |
| Possible causes | – Faulty supply control circuit – Incorrect circuit performance – Wiring or connector issues |
| How to diagnose? | – Test the supply control circuit for range and performance – Inspect wiring and connectors – Check for related faults or issues |
P202F Meaning
The P202F: Reductant/Regeneration Supply Control Circuit Range/Performance code indicates that the reductant or regeneration supply control circuit is not performing within the expected range. This circuit is crucial for ensuring proper delivery of DEF or proper regeneration of the Diesel Particulate Filter (DPF). Malfunctions in the circuit can lead to ineffective emissions reduction and cause increased NOx emissions.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for additional codes related to the reductant or regeneration system. Other codes may help pinpoint the source of the issue. | OBD-II Scanner |
| Test the Supply Control Circuit | Use a multimeter or diagnostic tool to test the performance of the reductant/regeneration supply control circuit. Ensure that the circuit is operating within the manufacturer’s specifications for voltage and current. | Multimeter, Diagnostic Tool |
| Inspect Wiring and Connectors | Visually inspect all wiring and connectors associated with the supply control circuit. Look for signs of damage, corrosion, or loose connections that could cause poor performance. | Flashlight, Multimeter |
| Test Circuit Continuity | Perform a continuity test on the wiring to check for any shorts, breaks, or high resistance that could be affecting the performance of the supply control circuit. | Multimeter |
| Inspect Supply Components | Check the reductant supply pump, valves, and other related components to ensure they are functioning correctly. A malfunctioning component could lead to poor system performance. | Diagnostic Tool |
| Check for Related Faults or Issues | Investigate any related system faults, such as DPF or SCR (Selective Catalytic Reduction) system malfunctions, which could impact the operation of the supply control circuit. | Diagnostic Tool |
| Repair or Replace Faulty Components | If any components, wiring, or connectors are found to be faulty or damaged, repair or replace them to restore proper operation of the supply control circuit. | Wiring Repair Kit, Replacement Parts |
| Clear the Code and Test Drive | After making repairs, clear the P202F code using an OBD-II scanner. Take the vehicle for a test drive to ensure the issue is resolved and the control circuit operates within the correct range. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | After the test drive, re-scan the vehicle to verify that the P202F code has not returned. | OBD-II Scanner |
Free PDF: How to choose OBD2 scanner
I’ve made you a free PDF to choose the OBD2 scanner in 5 minutes.
✅ Which OBD2 scanner is best?
✅ Which type should you get (DIY, Pro, Hobby)
✅ What is the best scanner for the exact brand/feature (e.g best for BMW)
✅ How to get a Bi-Directional tool for as cheap as $40
✅ Discount coupons for scanners
PDF is 100% free and it is designed to help you pick a scanner in less than a few minutes! Not a boring 50-page guide.
Just tell me where to send it.
Hi, I am Juraj “Yuri” Lukacko. I got frustrated by unhelpful and scammy mechanics, so I decided to learn everything about car diagnostics myself. I test dozens of new car diagnostic tools every month along with learning new strategies to fix and customize cars. About Juraj Lukacko (Yuri)