What Does P202D Mean?
The system has detected a leak in the diesel exhaust fluid (DEF/reductant) system. This can result from damaged lines, failed seals, or tank damage, leading to DEF loss and SCR system failure.
Common Causes
30%
Cracked or damaged DEF supply lines or hoses
25%
Failed DEF tank seals or tank damage
20%
Leaking DEF injector or injector seal
15%
Damaged DEF pump or pump housing seal
10%
Loose or damaged DEF line fittings and connections
Diagnostic Steps
1
Step 1: Perform visual inspection of entire DEF system including tank, lines, pump, and injector for wetness or crystallized DEF residue
2
Step 2: Check DEF tank level and monitor for rapid decrease over short period
3
Step 3: Inspect DEF lines under vehicle for damage from road debris or corrosion
4
Step 4: Pressure test DEF system if equipped with appropriate tools to locate leak
5
Step 5: Inspect DEF injector mounting area and exhaust pipe for signs of leakage
Estimated Repair Cost
$200 - $1,500
Parts + labor, varies by vehicle and location
The system has detected a leak in the diesel exhaust fluid (DEF/reductant) system. This can result from damaged lines, failed seals, or tank damage, leading to DEF loss and SCR system failure.
The most common cause of P202D (Reductant Leakage) is: Cracked or damaged DEF supply lines or hoses
Typical repair costs for P202D range from $200 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive short-term. DEF leaks will cause SCR system failure, triggering engine derate after warning period. DEF is corrosive and can damage vehicle components.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P202D to identify the root cause.
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Quick Info
Category
Powertrain
System
Selective Catalytic Reduction (SCR) Emissions System
Difficulty
Type
Generic (SAE)
Recommended Tools
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