What Does P0544 Mean?
The ECM has detected a general malfunction in the exhaust gas temperature (EGT) sensor circuit for Bank 1, Sensor 1, located upstream of the turbocharger or catalytic converter. This could be an open circuit, short to ground, short to power, or signal rationality issue. Exhaust gas temperature monitoring is critical for protecting the turbocharger, catalytic converter, and DPF from thermal damage.
Common Causes
40%
Failed exhaust gas temperature sensor with internal open or short circuit due to extreme heat exposure
30%
Damaged or corroded wiring harness between EGT sensor and ECM, often melted from exhaust heat
20%
Corroded or loose EGT sensor connector due to heat cycling and moisture exposure in exhaust area
10%
ECM internal fault in the EGT sensor input circuit or analog-to-digital converter channel
Diagnostic Steps
1
Step 1: Locate the Bank 1 Sensor 1 EGT sensor (upstream of turbo or first catalytic converter on Bank 1). Inspect the sensor, connector, and wiring for visible heat damage, melted insulation, or corrosion.
2
Step 2: Disconnect the EGT sensor and measure resistance across the sensor terminals with a digital multimeter. A typical NTC-type EGT sensor should read approximately 100-200 ohms at room temperature. Compare to manufacturer specifications.
3
Step 3: With the sensor disconnected, check for continuity and proper resistance in the wiring harness from the sensor connector back to the ECM pins. Verify no short to ground or short to battery voltage exists on either signal wire.
4
Step 4: Reconnect the sensor and backprobe the signal wire at the ECM connector. With the engine running, the voltage should change proportionally to exhaust temperature (typically 0.5-4.5V). Compare live data readings to an infrared thermometer reading at the sensor location.
5
Step 5: If wiring and sensor test good, check ECM connector pins for corrosion or spread terminals. If all external circuits are within specification, the ECM may require replacement.
Estimated Repair Cost
$80 - $350
Parts + labor, varies by vehicle and location
The ECM has detected a general malfunction in the exhaust gas temperature (EGT) sensor circuit for Bank 1, Sensor 1, located upstream of the turbocharger or catalytic converter. This could be an open circuit, short to ground, short to power, or signal rationality issue. Exhaust gas temperature monit...
The most common cause of P0544 (Exhaust Gas Temperature Sensor Circuit (Bank 1 Sensor 1)) is: Failed exhaust gas temperature sensor with internal open or short circuit due to extreme heat exposure
Typical repair costs for P0544 range from $80 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Loss of EGT monitoring may cause the ECM to enter a protective mode limiting engine power. Continued driving without proper EGT feedback risks turbocharger or catalytic converter damage from unmonitored overheating.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0544 to identify the root cause.
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Quick Info
Category
Powertrain
System
Exhaust / Emission Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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