FITMENT
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2011-2016 Chevy/GMC 2500 HD, 3500 HD with 6.6L Duramax LML
Interchange Part Numbers:
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273-10029, 12643246, 12639455.
DESCRIPTION
Product Overview
- Serving as a dedicated position in modern multi-point exhaust monitoring networks, the TruckTok 273-10029 EGT Sensor provides location-specific thermal telemetry tailored to complex DPF and SCR emissions architectures. Engineered to meet narrow voltage calibration bands, this heavy-duty sensor delivers non-interchangeable signal accuracy directly to the engine controller.
- Built strictly to factory GM 273-10029 / 12639455 parameters, this direct replacement eliminates signal drift and position-mismatch errors. Installing this exact-fit unit stops false plausibility diagnostic codes, stabilizes DEF dosing calculations, and prevents automatic engine power derates during heavy-duty operation.
Key Features
- High-purity thermocouple metallurgy prevents baseline output decay over long-term operation, ensuring unwavering signal accuracy across the sensor’s full service life.
- Precision-calibrated sensing placement penetrates boundary-layer exhaust thermal gradients to record true core flow temperatures rather than cooler pipe wall readings.
- Built to withstand thousands of high-heat active DPF burn cycles without internal junction degradation or electrical resistance loss.
FAQ
Q: What happens if this 273-10029 sensor is accidentally installed in the wrong EGT position on an LML?
A: Because each of the four EGT positions on the LML platform utilizes a location-specific millivolt calibration curve, installing an incorrect positional sensor will cause the ECM to miscalculate exhaust temperatures. The engine controller will detect signal implausibility—typically resulting in false rationality fault codes, aborted DPF regeneration cycles, or unexpected engine derate within a single drive cycle.
Q: Can a failing EGT sensor cause the LML to derate without triggering a check engine light?
A: Yes. An EGT sensor experiencing momentary signal drift or intermittent electrical open-circuits can cause the ECM to trigger short-term thermal protection or torque limitations. These transient events may resolve before a pending Diagnostic Trouble Code (DTC) fully latches, making live-data recording on a diagnostic scan tool essential for pinpointing the fault.
Q: How does the LML’s sensor life compare to the LMM’s?
A: Sensor service life on the LML platform is generally improved due to enhanced emissions thermal management. The integration of the Selective Catalytic Reduction (SCR) network reduces the frequency and peak intensity of active DPF regenerations, lowering continuous thermal stress on internal thermocouple junctions.
Q: Do I need to perform a regen after replacing an EGT sensor?
A: No. Once diagnostic trouble codes are cleared, the ECM will resume standard emissions monitoring and trigger an automatic burn cycle when soot accumulation reaches operational thresholds. If a failed sensor previously interrupted pending regens, the vehicle may initiate a routine burn cycle shortly after driving is resumed.
Q: Need a different LML EGT sensor position?
A: Your LML uses multiple EGT sensors at different positions. We carry the 19418987, 12622554, and 273-10001. Match the part number on your old sensor to confirm.
