What Does P244B Mean?
The ECM has detected excessive differential pressure across the diesel particulate filter on Bank 1. This indicates severe DPF clogging that restricts exhaust flow and requires immediate attention.
Safety Warning
Continued driving may result in severe engine power loss, engine derate mode, or potential engine damage from excessive backpressure. Address immediately.
Common Causes
50%
Severely clogged diesel particulate filter from excessive soot accumulation
25%
Failed DPF regeneration cycles due to driving patterns or system malfunction
15%
Contaminated DPF from oil consumption or fuel additives
7%
Faulty differential pressure sensor reading falsely high
3%
Blocked or kinked pressure sensing lines
Diagnostic Steps
1
Step 1: Check DPF differential pressure readings at idle and under load conditions
2
Step 2: Review regeneration history and verify last successful regeneration attempt
3
Step 3: Inspect pressure sensor hoses for blockage or restriction
4
Step 4: Attempt forced DPF regeneration using scan tool if parameters allow
5
Step 5: Test differential pressure sensor calibration against known good values
Estimated Repair Cost
$300 - $4,500
Parts + labor, varies by vehicle and location
The ECM has detected excessive differential pressure across the diesel particulate filter on Bank 1. This indicates severe DPF clogging that restricts exhaust flow and requires immediate attention.
The most common cause of P244B (Diesel Particulate Filter Differential Pressure Too High Bank 1) is: Severely clogged diesel particulate filter from excessive soot accumulation
Typical repair costs for P244B range from $300 to $4,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Continued driving may result in severe engine power loss, engine derate mode, or potential engine damage from excessive backpressure. Address immediately.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P244B to identify the root cause.
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Quick Info
Category
Powertrain
System
Diesel Emissions System
Difficulty
Type
Generic (SAE)
Recommended Tools
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