FITMENT
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2007.5-2010 Chevy/GMC 2500 HD, 3500 HD with 6.6L Duramax LMM
Interchange Part Numbers:
DESCRIPTION
Product Overview
- Operating as the post-DPF thermal verification anchor on Duramax LMM platforms, the TruckTok 273-10007 EGT Sensor confirms that regeneration cycles reach and sustain targeted burn temperatures. While upstream sensors monitor temperature ramp-up, this downstream unit delivers the critical closing feedback signal required by the ECM to verify successful soot oxidation and exit active regeneration mode.
- Precision-calibrated for the 800°F–1,000°F post-filter thermal window, this heavy-duty replacement restores exact voltage translation to the engine controller. Replacing a drifted original sensor resolves continuous, infinite regeneration loops—protecting oil viscosity from fuel dilution, preventing excess fuel consumption, and safeguarding the DPF assembly.
Key Features
- Advanced sensing technology provides precise, real-time monitoring of exhaust gas temperatures for optimal engine management.
- Engineered to withstand intense engine vibrations and harsh under-vehicle conditions for long-lasting reliability.
- Essential for tracking EGT levels to maintain peak performance and prevent critical engine damage.
- Features a specialized OE-grade connector that ensures a seamless, high-integrity link to your vehicle’s wiring harness for consistent data transmission.
FAQ
Q: How do I know if I need the pre-DPF or post-DPF sensor?
A: The pre-DPF position (273-10006) monitors raw exhaust temperatures prior to the filter, while this downstream position measures stabilized, post-filter temperatures to verify regeneration thermal completion. Cross-referencing the stamped OEM part number on your existing unit remains the most reliable verification method.
Q: Why does the post-DPF sensor fail less often than the pre-DPF one?
A: Post-filter exhaust temperatures run roughly 200–300°F cooler than pre-DPF temperatures during active regeneration cycles. Because the filter assembly absorbs initial thermal spikes, reduced peak heat exposure minimizes internal thermocouple stress and fatigue over time.
Q: Can I test whether the DPF is actually reaching temperature by comparing pre- and post-DPF sensor readings?
A: Yes. During an active DPF burn, downstream temperatures should track upwards—typically reaching 800°F or higher—with a brief thermal lag relative to the upstream sensor. If upstream readings exceed 1,100°F while downstream readings remain static (e.g., at 400°F), it indicates either a degraded downstream sensor signal or an incomplete regeneration burn.
Q: Is this sensor compatible with the earlier LBZ Duramax (2006–2007)?
A: No. LBZ platforms were produced without factory DPF emissions hardware and do not utilize post-DPF exhaust temperature monitoring. This part number is strictly engineered for 2007.5–2010 LMM Duramax platforms equipped with factory particulate filters.
Q: Need the matching pre-DPF sensor for your LMM?
A: If you need the upstream position, grab the 273-10006. Many LMM owners replace both at the same time since they share the same age and heat cycles.
