Reductant Leakage Detected
The P202D code indicates that the engine control module (ECM) has detected a leak in the reductant (diesel exhaust fluid, DEF) system. This can be caused by a faulty DEF injector, a cracked DEF tank, loose connections, or a malfunctioning DEF pump. The system monitors the pressure and flow of DEF; when a leak is detected, the ECM sets this code to alert the driver and may limit vehicle performance to reduce emissions.
1. Most Common Causes
- Loose or damaged DEF injector
- Cracked DEF tank or lines
- Faulty DEF pump
- Defective DEF quality sensor
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Increased DEF consumption
- Possible white smoke from exhaust
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm P202D and check for related codes.
Step 2: Visually inspect the DEF system for leaks, cracks, or loose connections.
Step 3: Perform a pressure test on the DEF system to locate the leak.
Step 4: Check the DEF injector for proper operation and replace if necessary.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as the vehicle may enter limp mode, reducing power and potentially causing further damage. Additionally, continued driving may lead to non-compliance with emissions regulations.
How much does it cost to fix?▼
The cost to fix a DEF leak typically ranges from $50 to $150 for diagnosis and minor repairs like tightening connections, but can be higher if parts like the injector or tank need replacement.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.