P2062 - Reductant/Regeneration Supply Control Circuit/Open
The P2062 code indicates an open or malfunction in the reductant (DEF) supply control circuit, typically related to the diesel exhaust fluid (DEF) pump or its control module. This circuit is responsible for delivering DEF to the selective catalytic reduction (SCR) system to reduce NOx emissions. An open circuit means there is a break in the electrical path, preventing proper pump operation and potentially causing increased emissions or triggering a check engine light.
1. Most Common Causes
- Open or shorted wiring in the DEF pump control circuit
- Faulty DEF pump or pump control module
- Blown fuse or relay for the DEF system
- Corroded or loose electrical connectors
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance or power
- Increased diesel exhaust fluid consumption or warning
- Possible engine derate or limp mode
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data to confirm P2062.
Step 2: Visually inspect the DEF pump wiring and connectors for damage, corrosion, or loose connections.
Step 3: Check the DEF system fuse and relay; replace if blown.
Step 4: Test the DEF pump control circuit for continuity and voltage using a multimeter.
Step 5: If circuit is open, repair wiring or replace the DEF pump/module as needed.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances with this code, as it may cause the vehicle to enter limp mode or fail emissions. Short trips to a repair shop are generally acceptable.
How much does it cost to fix?▼
Repair costs typically range from $200 to $600, depending on whether the issue is a simple wiring repair or requires replacement of the DEF pump or control module.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.