What Does P2003 Mean?
The diesel particulate filter on Bank 2 is not functioning efficiently, either from excessive soot loading or structural failure. This is the Bank 2 equivalent of P2002 in dual-bank diesel exhaust systems.
Common Causes
45%
Clogged DPF from excessive soot accumulation and failed regeneration attempts
25%
Faulty Bank 2 differential pressure sensor giving incorrect readings
15%
Damaged or melted DPF substrate from oil contamination or excessive regeneration temperature
10%
Bank 2 regeneration system failure affecting fuel dosing or temperature control
5%
Exhaust leaks on Bank 2 affecting pressure measurements
Diagnostic Steps
1
Step 1: Monitor Bank 2 DPF differential pressure and compare to Bank 1 and specifications
2
Step 2: Check Bank 2 DPF soot load percentage and regeneration history
3
Step 3: Inspect Bank 2 pressure sensor lines for blockage or damage
4
Step 4: Compare Bank 1 and Bank 2 exhaust temperatures during regeneration
5
Step 5: Attempt forced regeneration on Bank 2 or evaluate DPF condition for replacement if regeneration unsuccessful
Estimated Repair Cost
$200 - $4,500
Parts + labor, varies by vehicle and location
The diesel particulate filter on Bank 2 is not functioning efficiently, either from excessive soot loading or structural failure. This is the Bank 2 equivalent of P2002 in dual-bank diesel exhaust systems.
The most common cause of P2003 (Diesel Particulate Filter Efficiency Below Threshold Bank 2) is: Clogged DPF from excessive soot accumulation and failed regeneration attempts
Typical repair costs for P2003 range from $200 to $4,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle will experience reduced power and fuel economy. Continued operation may cause complete exhaust blockage leading to engine damage or stalling. May enter limp mode.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2003 to identify the root cause.
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Quick Info
Category
Powertrain
System
Diesel Emissions Control System
Difficulty
Type
Generic (SAE)
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