Exhaust System Emission Control Urea Injection System (def) Problems of Chevrolet Silverado 1500

The contact owns a 2021 Chevrolet Silverado 1500. The contact stated that while driving approximately 65 mph, the message "service def system" was displayed and the check engine warning was illuminated. The message speed would reduce by increments of 10 to 15 mph until the vehicle could not accelerate 5 mph after driving 75 miles. The contact stated that a handheld scanner was used to retrieve dtc: p20b9. The contact stated that the failure was a recurring failure. The vehicle was taken to a local dealer where it was diagnosed and determined that the def tank heater module needed to be replaced. The contact stated that the dealer was aware of TSB: 21-na-002 and 22-na-150; however, the vehicle had a salvage title and was not eligible for the repairs. The manufacturer was informed of the failure and referred the contact to the NHTSA hotline for assistance. The failure mileage was approximately 53,400.

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The contact owns a 2023 Chevrolet Silverado 1500. The contact stated that while driving approximately 65 mph, the vehicle started to lose motive power. There were several unknown warning lights illuminated, and the message that the vehicle would not exceed 55 mph while driving. The contact stated that after driving for several miles, the message appeared that the vehicle would not accelerate to 30 mph while driving. The contact had taken the vehicle to a local dealer, who diagnosed the vehicle and determined that the def tank heater needed to be replaced; gm part number: 85856213; however, the part was on a national back order. The vehicle was not repaired. The manufacturer was informed of the failure. The failure mileage was approximately 67,000.

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The contact owns a 2020 Chevrolet Silverado 1500. While operating in negative (-41°f) degree winter conditions, the "service emission system" entered an epa-mandated speed limitation in limp mode messages were displayed. Dealer diagnostics confirmed dtc: p20b9 (heater control circuit open) and p20c1. The failure was identified as the melting of the diesel exhaust fluid (def) tank electrical connector due to undersized terminal pins overheating (joule heating). The contact stated that it was a latent design defect that posed a fire risk and a safety hazard due to sudden loss of motive power in arctic climates (-45°f). General motors acknowledged the defect in 2500hd models, special coverage: n212342980; but excluded the 1500 models. The failure mileage was 29,354.

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The contact owns a 2024 Chevrolet Silverado 1500. The contact stated while driving 65 mph and hauling a trailer, the "def empty, refill now" message displayed, while the diesel exhaust fluid (def) system was full. The failure reduced the power and speed. The vehicle was taken to the dealer and a second dealer, young GMC of burley (325 overland Ave, burley, id 83318), where it was determined that the diesel exhaust fluid (def) system would not function properly while hauling a trailer. The contact was informed that there were no repairs available for the vehicle. The vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 3,000.

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