P244B on GMC
Diesel Particulate Filter Differential Pressure Too High (Bank 1)
P244B on GMC vehicles indicates diesel particulate filter differential pressure too high (bank 1). Au7o has documented this code across 1 GMC model — most commonly on Sierra 2500HD. This code applies to diesel vehicles and means the engine computer detected that the pressure difference across the diesel particulate filter (DPF) is higher than allowed, indicating the filter is heavily restricted. The DPF traps soot from the exhaust and is periodically cleaned through regeneration. Excessively high differential pressure means too much soot or ash is clogging the filter. This can reduce power, trigger limp mode, and risk damaging the DPF or turbo if ignored, so it should be addressed promptly. Typical repair costs on GMC range from $600 to $3,500, depending on the specific model and root cause.
Common Causes of P244B
- •Clogged DPF from soot or ash accumulation
- •Failed or incomplete regeneration cycles
- •Faulty DPF differential pressure sensor
- •Frequent short-trip driving preventing regen
- •Faulty EGR causing excess soot
- •Blocked or kinked pressure sensor hoses
- •Faulty exhaust temperature sensor affecting regen
P244B on GMC by Model
GMC Sierra 2500HD(1 issue)
- LMM Duramax Diesel Particulate Filter Clogging and Failed Regeneration Cycles2007-2010
The 2007.5-2010 6.6L Duramax RPO LMM was GM's first Duramax with a diesel particulate filter, and the early calibration regenerates far too often. Owners on duramaxforum.com and dieselplace.com report the truck entering regen every 100-200 miles, and in trucks used for short trips, heavy idling or slow towing the regen cycle is repeatedly interrupted before completion. Soot then accumulates faster than it burns off, the differential pressure across the filter climbs, and the truck eventually refuses to self-regen at all and derates. The excess fuel injected late in the cycle for regeneration also washes down the cylinder walls and dilutes engine oil. This is an LMM-specific pattern; the pre-2007.5 LBZ has no DPF, and the LML added SCR/DEF which changed the regen strategy.
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View P244B across all makes →Frequently Asked Questions
What does P244B mean on GMC?▼
P244B stands for "Diesel Particulate Filter Differential Pressure Too High (Bank 1)." This code applies to diesel vehicles and means the engine computer detected that the pressure difference across the diesel particulate filter (DPF) is higher than allowed, indicating the filter is heavily restricted. The DPF traps soot from the exhaust and is periodically cleaned through regeneration. Excessively high differential pressure means too much soot or ash is clogging the filter. This can reduce power, trigger limp mode, and risk damaging the DPF or turbo if ignored, so it should be addressed promptly. On GMC specifically, this code is documented across 1 model.
What causes P244B on GMC vehicles?▼
Common causes on GMC: Clogged DPF from soot or ash accumulation, Failed or incomplete regeneration cycles, Faulty DPF differential pressure sensor, Frequent short-trip driving preventing regen, Faulty EGR causing excess soot. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P244B on a GMC?▼
Repair costs on GMC range from $600 to $3,500, depending on the specific model and root cause.
Which GMC models have P244B documented?▼
Au7o has documented P244B on 1 GMC model: Sierra 2500HD.