The P2062 trouble code, also known as “Reductant Supply Control Circuit/Open,” is a generic OBD-II diagnostic code. This error indicates that the Powertrain Control Module (PCM) has detected an issue with the electrical circuit responsible for controlling the reductant or Diesel Exhaust Fluid (DEF) supply pump. The reductant system is crucial for maintaining proper emissions control in diesel engines equipped with a Selective Catalytic Reduction (SCR) system. Addressing this code promptly is essential to avoid further damage to the vehicle’s emissions control system and overall performance.
| P2062 Code Meaning | P2062 Code Common Causes |
|---|---|
| Open circuit in the reductant supply pump control | Defective reductant supply pump |
| Failure in the SCR or PCM module | Shorted or damaged wiring in the circuit |
| Voltage irregularities in the reductant system | Corroded or loose electrical connections |
Understanding the Symptoms of P2062 Code
- Reduction in fuel efficiency
- Excessive black smoke from the exhaust
- Diminished engine performance or entering limp mode
- Illuminated Check Engine Light (CEL)
- Other SCR-related trouble codes may accompany P2062
Diagnosing and Resolving P2062 Code Issues
Symptoms:
If your vehicle exhibits any of the symptoms listed above, it is likely experiencing issues with its DEF system. These symptoms are often accompanied by a noticeable decrease in engine performance and emissions control.
Technical Explanation:
The reductant supply pump pressurizes DEF fluid, which is injected into the exhaust stream to reduce nitrogen oxide (NOx) emissions. The PCM monitors this process by checking voltage consistency and pressure sensor readings. When the PCM detects an open circuit or irregularity, it triggers the P2062 code.
Step-by-Step Diagnosis:
- Connect an OBD-II scanner to retrieve stored codes and freeze frame data.
- Inspect wiring and connectors for visible damage, corrosion, or disconnections.
- Use a digital volt/ohmmeter (DVOM) to test for voltage at the reductant supply pump.
- If voltage is absent, trace the circuit to identify breaks or shorts.
- If voltage is present, test the pump for proper operation using manufacturer specifications.
- If necessary, check for related technical service bulletins (TSBs) that may provide additional diagnostic guidance.
Solution Methods:
- Repair Damaged Wiring: Replace any damaged or corroded wires in the circuit.
- Replace Defective Pump: If testing confirms a faulty reductant supply pump, replace it with an OEM part.
- Reprogram or Replace PCM: If diagnostics indicate a faulty PCM, reprogram or replace it as needed.
- Clean Connections: Ensure all electrical connections are clean and secure to prevent voltage irregularities.
Cost Estimates:
- Diagnostic scan: $100–$150
- Wiring repair: $50–$200
- Reductant supply pump replacement: $300–$800
- PCM reprogramming/replacement: $500–$1,500
Warnings and Recommendations:
- Always use OEM parts for replacements to ensure compatibility.
- Avoid driving extensively with this code active as it can lead to catalyst damage.
- If unsure about any repair step, consult a certified mechanic.
Frequently Asked Questions About P2062
- What does the P2062 code mean?
The P2062 code indicates an open circuit in the reductant supply control system, which affects DEF injection in diesel engines. - Can I drive with a P2062 code?
You can drive short distances, but prolonged operation can damage emissions components. Repair as soon as possible. - What causes a P2062 code?
This code can be caused by a defective reductant pump, damaged wiring, faulty PCM, or corroded connections. - How do I diagnose a P2062 code?
A diagnostic scan tool and DVOM are used to check stored codes, inspect wiring, test voltage at the pump, and verify component functionality. - How much does it cost to fix a P2062 code?
The cost varies based on repairs needed but typically ranges from $300 to $1,500 depending on parts and labor. - Can I fix a P2062 code myself?
If you have experience with electrical diagnostics and access to tools like an OBD-II scanner and DVOM, you may be able to perform some repairs yourself. Otherwise, seek professional help. - What happens if I ignore this code?
Ignoring this code can lead to reduced fuel efficiency, increased emissions, and potential damage to the catalytic converter. - Is this code specific to certain vehicles?
No, it applies generically to OBD-II vehicles but repair steps may vary based on make and model.
The P2062 trouble code requires immediate attention due to its impact on vehicle emissions and performance. By following proper diagnostic procedures and addressing issues promptly, you can restore your vehicle’s functionality while avoiding costly repairs. When in doubt, always consult a certified mechanic for assistance.