P0546 on 2015-2024 GMC Sierra 3500HD — Exhaust Gas Temperature Sensor Circuit High Bank 1 Sensor 1
1 vehicles · 1 makes · $800-$2,500 repair
Most Reported On
P0546 is an OBD-II diagnostic trouble code meaning “Exhaust Gas Temperature Sensor Circuit High Bank 1 Sensor 1.” This code means the engine computer detected an abnormally high voltage (or out-of-range high signal) from the exhaust gas temperature (EGT) sensor on Bank 1, Sensor 1. The EGT sensor monitors exhaust heat to protect components like the turbocharger, catalytic converter, and diesel particulate filter from overheating. A faulty reading can disable protective strategies and may put the engine into reduced-power mode. This code is most commonly reported on 2015-2024 GMC Sierra 3500HD, with repair costs ranging from $800 to $2,500.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P0546, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
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BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
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LAUNCH CRP123X OBD-II Scanner
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A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
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Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
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- Oil reset, EPB, BMS, TPMS, injector coding
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FAQ
What does P0546 mean?
P0546 stands for "Exhaust Gas Temperature Sensor Circuit High Bank 1 Sensor 1." This code means the engine computer detected an abnormally high voltage (or out-of-range high signal) from the exhaust gas temperature (EGT) sensor on Bank 1, Sensor 1. The EGT sensor monitors exhaust heat to protect components like the turbocharger, catalytic converter, and diesel particulate filter from overheating. A faulty reading can disable protective strategies and may put the engine into reduced-power mode.
What are the most common causes of P0546?
The most common causes of P0546 are: Faulty exhaust gas temperature sensor, Open or shorted EGT sensor wiring, Corroded or loose sensor connector, Damaged sensor from excessive exhaust heat, Exhaust leak near the sensor, PCM circuit fault. The specific cause varies by vehicle.
How much does it cost to fix P0546?
Repair costs for P0546 range from $800 to $2,500, depending on the vehicle and root cause.
Which vehicles are affected by P0546?
Au7o has documented P0546 across 1 vehicle models from 1 manufacturers: GMC.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.