FITMENT
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2013-2018 Dodge Ram 2500, 3500, 4500, 5500 with 6.7L Diesel engine.
Interchange Part Numbers:
DESCRIPTION
Product Overview
- Engineered for DEF-era emissions control architectures, the TruckTok 68085774AB EGT Sensor provides the ultra-tight thermal response required by modern Cummins engine controllers. As a dual-function feedback source, its real-time temperature data simultaneously governs both DPF active regeneration cycles and DEF dosing precision without signal latency.
- Built to exact Mopar 68085774AB factory parameters, this heavy-duty replacement maintains long-term calibration stability under extreme exhaust heat cycles. It restores clean ECM voltage feedback—resolving sensor-induced emissions fault codes, preventing DEF over-injection, and protecting against engine power derates.
Key Features
- Precision-calibrated voltage mapping aligns with modern Cummins ECM parameters, maintaining strict signal tolerances across active DEF injection temperature ranges to prevent dosing errors.
- Maintains stable, non-drifting voltage output during extreme DPF regeneration temperature spikes (ambient to 1,200°F), preventing thermal overshoot/undershoot and unnecessary ECM parameter hunts.
- Factory-matched tip depth ensures true bulk gas measurement, preventing the massive temperature reading errors caused by boundary-layer turbulence or improper penetration.
- Internal thermocouple junction engineered to absorb continuous expansion and contraction cycles between cold starts and max-load towing without thermal fracture or resistance drift.
FAQ
Q: How does the DEF system interact with this EGT sensor?
A: The Cummins ECM uses EGT sensor data alongside NOx, exhaust flow, and engine load inputs to monitor exhaust conditions and optimize DEF dosing. Proper exhaust temperatures help ensure effective DEF evaporation and SCR performance while reducing the risk of urea deposits and emissions-related fault codes.
Q: Why does this sensor only have one part number while others have multiple supersessions?
A: When Mopar retains a single part number across an entire model run, it signifies that the initial engineering specification met all factory thermal performance standards without requiring field revisions. Unlike sensors that went through multiple iterations, the 68085774AB represents a stable, single-spec design.
Q: Can EGT sensor failure be mistaken for a turbo problem on the 2013–2018 Cummins?
A: Yes. An EGT sensor reading artificially low can delay factory turbo protection protocols, while a sensor reading high may prematurely trigger engine power derates or emergency thermal limits. If troubleshooting boost or turbo performance codes, verifying live EGT signal data first prevents costly and unnecessary turbocharger replacements.
Q: Can a dead or intermittent EGT sensor be bypassed temporarily to operate the vehicle?
A: No. The ECM uses active EGT telemetry for critical engine protection and emissions strategies, meaning it will not ignore a missing sensor signal. Operating with a fully failed sensor risks inhibiting automatic DPF regeneration cycles, leading to rapid soot accumulation and potential filter damage.
Q: Need a different EGT position for your 4th-gen Ram?
A: Your 6.7L Cummins has multiple EGT positions. We also carry the 68206021AA (2010–2021), 68306261AB (2019–2024), and 68306262AB (2019–2024). Match the part number on your old sensor.
