P249F on RAM
Diesel Particulate Filter Pressure Sensor Intermittent/Erratic (Bank 2)
P249F on RAM vehicles indicates diesel particulate filter pressure sensor intermittent/erratic (bank 2). Au7o has documented this code across 1 RAM model — most commonly on 2500. 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. Typical repair costs on RAM range from $300 to $3,500, depending on the specific model and root cause.
Common Causes of P249F
- •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)
P249F on RAM by Model
RAM 2500(1 issue)
- Diesel Exhaust Fluid (DEF) System Failures2013-2025
The 2013+ RAM 2500 6.7L Cummins diesel DEF (Diesel Exhaust Fluid) system is plagued with failures of the DEF heater, DEF pump, DEF injector, NOx sensors, and SCR catalyst. The DEF system is required for emissions compliance, and when it fails, the truck enters a "limp mode" that limits speed to 5 mph after a countdown timer expires. DEF heater failures are most common in cold climates where the fluid freezes and cracks the heater element. TSB 18-018-20 addresses DEF heater and quality sensor issues. The NOx sensors (inlet and outlet) fail frequently at $300-500 each.
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View P249F across all makes →Frequently Asked Questions
What does P249F mean on RAM?▼
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 RAM specifically, this code is documented across 1 model.
What causes P249F on RAM vehicles?▼
Common causes on RAM: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P249F on a RAM?▼
Repair costs on RAM range from $300 to $3,500, depending on the specific model and root cause.
Which RAM models have P249F documented?▼
Au7o has documented P249F on 1 RAM model: 2500.