P2062: Reductant/Regeneration Supply Control Circuit/Open

Definition

The OBD2 code P2062 indicates a problem with the reductant or regeneration supply control circuit, specifically that there is an open circuit, which means there is a break in the electrical connection affecting the system that manages the diesel exhaust fluid (DEF) or similar components

Common causes

Faulty reductant pump
Open or shorted wiring in the control circuit
Failed reductant control module
Clogged or damaged reductant lines
Defective connectors or terminals
Low reductant fluid level
Faulty fuel tank pressure sensor
Malfunctioning engine control module (ECM)

Common misdiagnoses

Faulty fuel injectors
Bad fuel pump
Exhaust system issues
Oxygen sensor failure
EGR valve problems
Wiring or connector issues
PCM (Powertrain Control Module) failure
Defective fuel pressure regulator
Incorrectly diagnosed DPF (Diesel Particulate Filter) issues
Misinterpreted symptoms related to other emissions control components

Troubleshooting steps

1. Check for Additional Codes

Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are other issues that need to be addressed
2. Inspect Wiring and Connectors
3. Visually inspect the wiring and connectors associated with the reductant supply control circuit. Look for signs of damage, corrosion, fraying, or loose connections
4. Pay special attention to any connectors that may be exposed to heat or moisture
5. Test the Reductant Pump
6. If applicable, test the reductant pump to ensure it is functioning correctly. You can do this by applying power directly to the pump to see if it operates
7. Check for any blockages in the reductant supply line that could prevent the flow of urea
8. Check the Reductant Level
9. Ensure that the reductant (urea) tank is filled to the appropriate level. Low levels can trigger fault codes
10. Inspect the tank for leaks or damage
11. Inspect the SCR System
12. Check the SCR system components, including the injector and the catalyst, for any signs of damage or malfunction
13. Ensure that the injector is not clogged and is functioning properly
14. Test the Control Circuit
15. Use a multimeter to test the resistance and continuity of the control circuit wiring. Look for any breaks or shorts in the circuit
16. Check the voltage at the control module and the reductant pump to ensure they are within specifications
17. Check the Engine Control Module (ECM)
18. If all other components check out, the issue may lie within the ECM. Ensure that the ECM is functioning correctly and is not causing the fault
19. Reprogramming or updating the ECM software may be necessary in some cases
20. Clear Codes and Test Drive
21. After performing repairs or replacements, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns
22. Consult Technical Service Bulletins (TSBs)
23. Check for any manufacturer-specific TSBs related to the P2062 code, as there may be known issues or recalls that could apply to your vehicle
24. Seek Professional Help
25. If you are unable to diagnose or resolve the issue, consider seeking help from a qualified mechanic or dealership with experience in diesel emissions systems. By following these steps, you should be able to identify and resolve the issue related to the P2062 code

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1. Check for Additional Codes

2. Inspect Wiring and Connectors

3. Visually inspect the wiring and connectors associated with the reductant supply control circuit. Look for signs of damage, corrosion, fraying, or loose connections

4. Pay special attention to any connectors that may be exposed to heat or moisture

5. Test the Reductant Pump

6. If applicable, test the reductant pump to ensure it is functioning correctly. You can do this by applying power directly to the pump to see if it operates

7. Check for any blockages in the reductant supply line that could prevent the flow of urea

8. Check the Reductant Level

9. Ensure that the reductant (urea) tank is filled to the appropriate level. Low levels can trigger fault codes

10. Inspect the tank for leaks or damage

11. Inspect the SCR System

12. Check the SCR system components, including the injector and the catalyst, for any signs of damage or malfunction

13. Ensure that the injector is not clogged and is functioning properly

14. Test the Control Circuit

15. Use a multimeter to test the resistance and continuity of the control circuit wiring. Look for any breaks or shorts in the circuit

16. Check the voltage at the control module and the reductant pump to ensure they are within specifications

17. Check the Engine Control Module (ECM)

18. If all other components check out, the issue may lie within the ECM. Ensure that the ECM is functioning correctly and is not causing the fault

19. Reprogramming or updating the ECM software may be necessary in some cases

20. Clear Codes and Test Drive

21. After performing repairs or replacements, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

22. Consult Technical Service Bulletins (TSBs)

23. Check for any manufacturer-specific TSBs related to the P2062 code, as there may be known issues or recalls that could apply to your vehicle

24. Seek Professional Help

25. If you are unable to diagnose or resolve the issue, consider seeking help from a qualified mechanic or dealership with experience in diesel emissions systems. By following these steps, you should be able to identify and resolve the issue related to the P2062 code