Powertrain (Engine & Gearbox)Standard EOBD

P0547 - Exhaust Gas Temperature Sensor Circuit Bank 2 Sensor 1

Q: What are the symptoms of fault code P0547?

• Check Engine Light (MIL) illuminated • Vehicle may enter Limp Home Mode • Reduced engine power/performance • Prevention of DPF regeneration (on diesel models) • Failed emissions test

Q: What causes fault code P0547?

• Most likely: Faulty Exhaust Gas Temperature (EGT) sensor (internal open circuit) • Likely: Damaged wiring harness or melted insulation due to contact with exhaust components • Possible: Corroded or loose terminals in the sensor connector • Rare: Faulty ECM software or internal ECM hardware failure

Q: How do you fix fault code P0547?

STEP 1: Visually inspect the wiring harness for Bank 2 Sensor 1. Look for burnt wires, chafing, or corroded electrical connectors. STEP 2: Measure the resistance of the sensor using a digital multimeter (unplugged). Normal resistance at room temperature is typically between 200–500 Ohms (refer to OEM specs). If the meter reads 'OL' (Open Loop), replace the sensor. STEP 3: Check for reference voltage from the ECM at the harness connector with ignition ON. You should typically see 5V. STEP 4: If wiring and reference voltage are correct but the code persists after sensor replacement, verify ground circuits and check for ECM software updates.

Last updated:1 February 2026

Related:Exhaust Temperature Sensor, Engine Control Unit (ECU), Wiring Harness, Diesel Particulate Filter (DPF)

System

Powertrain (Engine & Gearbox)

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Technical Description

The Engine Control Module (ECM) monitors the signal from the Exhaust Gas Temperature (EGT) sensor for Bank 2, Sensor 1. This sensor is typically located before the turbocharger or catalytic converter on the bank of the engine that does not contain cylinder #1. P0547 is triggered when the ECM detects a voltage signal that is outside the predetermined operating range, indicating an electrical fault such as an open circuit, short to ground, or short to voltage. The sensor is a thermistor used to monitor exhaust temperatures to prevent component damage and manage emissions systems.

Possible Causes

Faulty Exhaust Gas Temperature (EGT) sensor (internal open circuit)

Damaged wiring harness or melted insulation due to contact with exhaust components

Corroded or loose terminals in the sensor connector

Faulty ECM software or internal ECM hardware failure

Symptoms

Check Engine Light (MIL) illuminated

Vehicle may enter Limp Home Mode

Reduced engine power/performance

Prevention of DPF regeneration (on diesel models)

Failed emissions test

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P0547 - Exhaust Gas Temperature Sensor Circuit Bank 2 Sensor 1

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P0547 - Exhaust Gas Temperature Sensor Circuit Bank 2 Sensor 1

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