FITMENT
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2011-2016 Chevy/GMC 2500 HD, 3500 HD with 6.6L Duramax Diesel engine.
Interchange Part Numbers:
DESCRIPTION
Product Overview
- Operating as a critical dual-system feedback component on Duramax LML platforms, the TruckTok 19418987 EGT Sensor feeds real-time thermal telemetry simultaneously to both the DPF regeneration controller and the DEF/SCR dosing network. Engineered to withstand the extreme thermal dynamics of combined emissions architectures, it ensures exact exhaust temperature mapping required for precise soot oxidation and SCR catalytic efficiency.
- Built strictly to factory GM 19418987 voltage parameters, this heavy-duty sensor features a location-dedicated thermocouple calibration. Replacing a drifted or failed original unit clears persistent emissions fault codes, eliminates DEF dosing errors, and restores full engine torque delivery without signal latency.
Key Features
- Precision-calibrated for engine controllers managing both DPF soot burn cycles and DEF dosing strategies, preventing the compounded emissions errors caused by single-sensor telemetry drift.
- High-fidelity signal output isolates the ECM from electrical noise, ensuring consistent, drift-free voltage feed shared across independent DPF and SCR monitoring networks.
- Internal thermocouple generates clean, accurate millivolt readings immediately from ambient cold-start through peak regeneration temperatures, eliminating low-end signal distortion.
FAQ
Q: Does this sensor interact with the DEF system differently than the LMM sensors?
A: Yes. Unlike earlier LMM platforms that relied solely on DPF hardware, the LML architecture introduced Selective Catalytic Reduction (SCR) alongside the DPF system. The engine controller uses this sensor's thermal input simultaneously for active DPF burn timing and active DEF dosing. A failing sensor often triggers concurrent DPF and DEF fault codes due to corrupted thermal telemetry shared across both systems.
Q: How do I confirm this is the right sensor among all the LML EGT positions?
A: Duramax LML emissions networks utilize position-specific sensors with dedicated harness lengths and thermal calibrations that cannot be interchanged. This sensor is engineered specifically for Position 1 (EGT Sensor 1). To ensure accuracy, verify that your original unit matches OEM part number 19418987, 12636612 (or GM 12643246 / ACDelco 213-4695) prior to ordering.
Q: Can a failing 19418987 cause the truck to consume DEF faster than normal?
A: Yes. If the thermocouple drifts high, the ECM assumes elevated exhaust temperatures and compensates with excessive DEF injection. Conversely, if it drifts low, DEF dosing is delayed, destabilizing catalytic conversion efficiency. Noticeable changes in DEF usage without dedicated fluid system codes strongly point to EGT sensor signal drift.
Q: Is there a difference between the Silverado and Sierra versions of this sensor?
A: No. Chevrolet Silverado HD and GMC Sierra HD models with 6.6L Duramax LML engines utilize identical powertrain and emissions architectures. The 19418987 serves as the exact direct replacement regardless of vehicle brand trim.
Q: Need a different LML EGT sensor position?
A: We carry the 273-10029, 12622554, and 273-10001. Match the part number stamped on your old sensor to grab the right one.
