P207F on GMC
Reductant Quality Performance
P207F on GMC vehicles indicates reductant quality performance. Au7o has documented this code across 1 GMC model — most commonly on Canyon. This code applies to diesel vehicles with a Selective Catalytic Reduction (SCR) emissions system and means the quality of the diesel exhaust fluid (DEF, also called reductant or AdBlue) does not meet the required specification. The SCR system injects DEF into the exhaust to chemically neutralize nitrogen-oxide (NOx) pollutants, and the computer monitors NOx sensors and the DEF quality sensor to confirm the fluid is doing its job. When it concludes the reductant is contaminated, diluted, the wrong fluid, or not reducing emissions effectively, it sets this code. It generally indicates a DEF quality or SCR efficiency problem and often triggers reduced power or limited restarts to force the issue to be fixed. Typical repair costs on GMC range from $200 to $3,500, depending on the specific model and root cause.
Common Causes of P207F
- •Contaminated, diluted, or wrong fluid in the DEF tank (e.g., water or fuel)
- •Poor-quality or expired/degraded DEF
- •Faulty DEF quality sensor
- •Failing or clogged DEF (reductant) injector
- •Faulty NOx sensor(s)
- •DEF system or exhaust leaks
- •Aged or damaged SCR catalyst
P207F on GMC by Model
GMC Canyon(1 issue)
- 2.8L Duramax DEF System Faults and DPF Regeneration Issues2016-2025
The 2016+ Canyon Duramax 2.8L LWN diesel uses DEF (Diesel Exhaust Fluid) injection and a DPF (Diesel Particulate Filter) as part of its SCR emissions system. Owners frequently report DEF quality/level sensor faults, DPF regeneration failures in stop-and-go use, DEF pump failures, and NOx sensor faults. Trucks used primarily for short trips often cannot complete DPF regeneration cycles, leading to DPF plugging and the truck going into reduced power mode. GM issued multiple TSBs on DEF sensor calibration and DPF regen procedures.
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View P207F across all makes →Frequently Asked Questions
What does P207F mean on GMC?▼
P207F stands for "Reductant Quality Performance." This code applies to diesel vehicles with a Selective Catalytic Reduction (SCR) emissions system and means the quality of the diesel exhaust fluid (DEF, also called reductant or AdBlue) does not meet the required specification. The SCR system injects DEF into the exhaust to chemically neutralize nitrogen-oxide (NOx) pollutants, and the computer monitors NOx sensors and the DEF quality sensor to confirm the fluid is doing its job. When it concludes the reductant is contaminated, diluted, the wrong fluid, or not reducing emissions effectively, it sets this code. It generally indicates a DEF quality or SCR efficiency problem and often triggers reduced power or limited restarts to force the issue to be fixed. On GMC specifically, this code is documented across 1 model.
What causes P207F on GMC vehicles?▼
Common causes on GMC: Contaminated, diluted, or wrong fluid in the DEF tank (e.g., water or fuel), Poor-quality or expired/degraded DEF, Faulty DEF quality sensor, Failing or clogged DEF (reductant) injector, Faulty NOx sensor(s). Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P207F on a GMC?▼
Repair costs on GMC range from $200 to $3,500, depending on the specific model and root cause.
Which GMC models have P207F documented?▼
Au7o has documented P207F on 1 GMC model: Canyon.