What Does P246D Mean?
The two DPF pressure sensors are reading significantly different values, indicating one or both sensors are faulty or there's a problem with the DPF pressure measurement system. These sensors monitor differential pressure across the DPF to determine soot loading.
Common Causes
35%
Failed DPF differential pressure sensor
30%
Clogged or restricted pressure sensor hoses
20%
Damaged or leaking pressure sensor lines
10%
Carbon buildup in pressure sensor ports
5%
Faulty wiring or connector to pressure sensor
Diagnostic Steps
1
Step 1: Compare live data readings from both DPF pressure sensors at idle and under load
2
Step 2: Inspect pressure sensor hoses for cracks, kinks, or blockages; check for carbon buildup at sensor ports
3
Step 3: Disconnect pressure hoses and apply known pressure to each sensor independently; verify sensor response
4
Step 4: Check electrical connections and sensor voltage supply/ground circuits
5
Step 5: Replace the sensor showing abnormal readings or both sensors if correlation cannot be established
Estimated Repair Cost
$200 - $600
Parts + labor, varies by vehicle and location
The two DPF pressure sensors are reading significantly different values, indicating one or both sensors are faulty or there's a problem with the DPF pressure measurement system. These sensors monitor differential pressure across the DPF to determine soot loading.
The most common cause of P246D (Diesel Particulate Filter Pressure Sensor "A"/"B" Correlation) is: Failed DPF differential pressure sensor
Typical repair costs for P246D range from $200 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive but DPF monitoring is compromised. Without accurate pressure readings, regeneration may not occur properly leading to eventual DPF clogging.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P246D to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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