P249F: Diesel Particulate Filter Pressure Sensor Intermittent/Erratic (Bank 2)
4 vehicles · 4 makes · $200-$3,500 repair
Most Reported On
P249F is an OBD-II diagnostic trouble code meaning “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. This code is most commonly reported on 2013-2025 RAM 2500 (Big Horn, Laramie, Laramie Longhorn, Limited, Limited Longhorn, Lone Star, Rebel, SLT, Tradesman), 2016-2023 Chevrolet Colorado (LT, Z71, ZR2), and 2016-2025 GMC Canyon (All Terrain, Denali, SLE, SLT), plus 1 other vehicle, with repair costs ranging from $200 to $3,500.
Common Causes
Typical Repair Cost
Based on 4 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P249F, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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Vehicles Affected (4)
FAQ
What does P249F mean?
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.
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?
Repair costs for P249F range from $200 to $3,500, depending on the vehicle and root cause.
Which vehicles are affected by P249F?
Au7o has documented P249F across 4 vehicle models from 4 manufacturers: Audi, Chevrolet, GMC, RAM.
Sources (7)
- ForumCummins Forum: SCR gone bad
- ForumRamForumz: DEF issue
- mediaTruck Camper Adventure: Going Into the Dreaded Diesel DEF Limp Mode
- manufacturerBSBuilt: Maintain 6.7L Cummins DEF System (2010-2025)
- ForumRamForumz: P2048 5 MPH Derate Def system problem
- NHTSANHTSA Complaint #11376453
- otherUnited States v. Volkswagen AG et al. / 3.0L TDI Class Action Settlement
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.