Exhaust Gas Temperature Sensor Circuit Low Bank 2 Sensor 4
The P2475 code indicates that the exhaust gas temperature (EGT) sensor circuit for Bank 2, Sensor 4 is reading a voltage lower than the expected range. This sensor monitors exhaust temperature to protect the diesel particulate filter (DPF) and catalytic converter from overheating. A low circuit condition can be caused by a faulty sensor, wiring issues, or a short to ground. This code is common in diesel vehicles and can lead to reduced engine performance and potential DPF damage if ignored.
1. Most Common Causes
- Faulty exhaust gas temperature sensor (EGTS) Bank 2 Sensor 4 with internal resistance out of specification
- Short to ground in the sensor signal or reference wire
- Corroded, oxidized, or damaged connector pins at the sensor
- Open circuit or high resistance in the wiring between the sensor and the PCM
- Intermittent fault or damage in the powertrain control module (PCM)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Poor fuel economy
- Possible DPF regeneration issues
3. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for related codes.
Step 2: Visually inspect the EGT sensor and wiring for damage, corrosion, or loose connections.
Step 3: Measure the sensor's resistance and compare to manufacturer specifications; a short circuit indicates a faulty sensor.
Step 4: Check the voltage at the sensor connector with the ignition on; should be around 5V reference. If low, trace wiring for shorts.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause DPF damage and reduced performance. Limp mode may activate.
How much does it cost to fix?▼
The cost typically ranges from $150 to $400, including parts and labor, depending on the vehicle and sensor location.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.