P0544: Exhaust Gas Temperature Sensor Circuit (Bank 1 Sensor 1)
The engine computer sees an electrical problem with exhaust temperature sensor 1.
Green, yellow, red: three ways P0544 can look
The same code can be a quick fix or a reason to pull over. Match your situation to the closest example.
Keep an eye on it
Set once.
Schedule a repair
Returns or regens stop. Repair soon.
Stop and get help
Derate. Get it fixed.
Symptoms you might notice
- Check engine light
- Regen problems
Common causes, cheapest first
- Failed sensor
- Heat-damaged wiring
- Corroded connector
What you can check before calling
- Inspect wiring near the exhaust
A code points to a system, not a part. Replacing parts based on the code alone is how people spend money without fixing the problem. Testing confirms the cause first.
Want the full story? Read our guide: DPF regeneration explained: passive, active and forced.
Generic codes (second character 0) mean the same thing on every vehicle. Some manufacturers add their own details, so check service information for your exact vehicle.
Related codes
More diesel & cummins codes
- P2002
Diesel Particulate Filter Efficiency Below Threshold (Bank 1) - P2463
Diesel Particulate Filter Restriction - Soot Accumulation - P242F
Diesel Particulate Filter Restriction - Ash Accumulation - P2459
Diesel Particulate Filter Regeneration Frequency - P2453
Diesel Particulate Filter Pressure Sensor A Circuit Range/Performance - P2454
Diesel Particulate Filter Pressure Sensor A Circuit Low
Look up another code
Cummins fault code (like 1922), J1939 SPN and FMI (like SPN 3251 FMI 0), or an OBD-II code (like P0420).
Questions
What does P0544 mean?
P0544 means "Exhaust Gas Temperature Sensor Circuit (Bank 1 Sensor 1)". The engine computer sees an electrical problem with exhaust temperature sensor 1.
Can I drive with code P0544?
It depends on what the vehicle is doing. Green: Set once. Yellow: Returns or regens stop. Repair soon. Red: Derate. Get it fixed.
What causes P0544?
The most common causes are: failed sensor; heat-damaged wiring; corroded connector.
Is P0544 a serious code?
It can be. Derate. Get it fixed.
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