Exhaust Gas Temperature Sensor Circuit (Bank 1 Sensor 1)
The P0544 code means the vehicle's onboard diagnostic system has detected: Exhaust Gas Temperature Sensor Circuit (Bank 1 Sensor 1). This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $100 - $400 (parts and labor)
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Common Symptoms
- Check Engine Light on
- Reduced engine power (limp mode)
- DPF regeneration issues on diesels
- Turbo protection mode activated
Probable Causes (Ranked by Likelihood)
- Failed exhaust gas temperature (EGT) sensor Very High
- Wiring damage from exhaust heat exposure High
- Corroded EGT sensor connector Moderate
- ECM input circuit failure for EGT Low
Step-by-Step Diagnostic Procedure
-
Read EGT sensor value with a scan tool; compare to expected temperature based on engine load and RPM
-
Inspect EGT sensor wiring for heat damage from proximity to exhaust components
-
Measure EGT sensor resistance at room temperature and compare to specification
-
Check the sensor connector for corrosion or heat damage
Frequently Asked Questions
What is an exhaust gas temperature sensor?
An EGT sensor measures the temperature of exhaust gases at various points in the exhaust system. These readings are critical for protecting the turbocharger, managing DPF regeneration on diesels, and monitoring catalytic converter operation.
Is P0544 common on diesel trucks?
Yes. P0544 is very common on diesel trucks that have multiple EGT sensors for DPF management. The sensors are exposed to extreme temperatures and harsh conditions, leading to a higher failure rate than most other sensors.
Will P0544 put my truck in limp mode?
Yes, on many vehicles. The EGT sensor data is critical for turbocharger and DPF protection. Without reliable temperature data, the ECM may limit engine power to prevent potential damage to these expensive components.
Sources
This page is built from documented references. Verify against your own service info before repair work.
P0544 on Diesel, EV & Equipment
The same code ID appears across other engines and platforms. The diagnostic flow varies by manufacturer — these are the platform-specific breakdowns:
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