P249F on Chevrolet: How to Diagnose & Fix
Diesel Particulate Filter Pressure Sensor Intermittent/Erratic (Bank 2)
1 Chevrolet model · 1 documented issue · $200-$2,500 repair
P249F on Chevrolet by model: symptoms, diagnosis and fix
The 2.8L Duramax diesel can experience issues with the emissions system including DEF (Diesel Exhaust Fluid) quality sensors, DPF (Diesel Particulate Filter) regeneration problems, and NOx sensor failures. These can cause reduced power mode and check engine lights.
Common Symptoms
- Check engine light with emissions codes
- Reduced power mode/limp mode
- DEF quality warning message
- Service exhaust system message
- Increased fuel consumption during regeneration
- Strong exhaust smell
How to Fix
Use quality DEF fluid from reputable sources. If DEF quality warning appears, have system diagnosed - may need sensor replacement. Allow DPF regeneration cycles to complete (don't shut off during regen). Replace NOx sensors when faulty.
Sources for this issue (1)
P249F code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P249F mean on a Chevrolet?
P249F stands for "Diesel Particulate Filter Pressure Sensor Intermittent/Erratic (Bank 2)." This is a diesel emissions code. The diesel particulate filter (DPF) traps soot from the exhaust, and a pressure sensor measures the pressure difference across the filter so the computer knows how full it is and when to run a cleaning (regeneration) cycle. P249F means the DPF pressure sensor signal on Bank 2 is intermittent or erratic — the reading jumps around or cuts out unpredictably rather than staying steady. This can cause the computer to misjudge soot levels, trigger unnecessary or failed regenerations, and may put the engine into a reduced-power mode. On Chevrolet it is documented across 1 model: Colorado.
What are the most common causes of P249F?
The most common causes of P249F are: Faulty or aging DPF differential pressure sensor, Loose, cracked or kinked pressure sensor hoses/tubes, Soot, moisture or carbon clogging the sensor lines, Loose or intermittent electrical connector at the sensor, Chafed or partially broken sensor wiring, Corrosion or water intrusion in the connector, Faulty ECM/sensor reference signal (less common). The specific cause varies by vehicle.
How much does it cost to fix P249F on a Chevrolet?
Published repair estimates on Chevrolet range from $200 to $2,500 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P249F on a different make?
View P249F across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.