Exhaust Gas Temperature Sensor 1 - Circuit High

The exhaust gas temperature sensor reads how hot the exhaust gases are coming from the engine. A value over 5 volts means the sensor or the circuit is likely broken.

The Engine Control Module (ECM) expects input voltage from the exhaust gas temperature sensor between 0.5 to 4.5 volts under normal operating conditions. Values above 4.5 volts trigger this fault code.

Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.

1. 1Check the wiring and connectors for visible damage or corrosion. If the connections look good, move to the next step.
2. 2Unplug the exhaust gas temperature sensor and use a multimeter to check the voltage at the connector. It should be under 5 volts with ignition on (engine off). If it reads more, check for short circuits in the wiring.
3. 3Connect the multimeter to the sensor output and ground, while the vehicle is running. The voltage should vary based on exhaust temperature. If it's stuck over 4.5 volts, the sensor is likely faulty and should be replaced.
4. 4If the voltage checks out but the code persists, inspect the ECM for faults or damaged circuits.

• Short circuit in the wiring harness
• Faulty exhaust gas temperature sensor
• Corrosion or poor connection at the sensor connector
• Open circuit in the sensor signal wire

$$$ (approximately $200-$800)