P2475: Exhaust Gas Temperature Sensor Circuit Low Bank 2 Sensor 4
The P2475 code indicates that the Engine Control Module (ECM) has detected a low voltage signal from the exhaust gas temperature (EGT) sensor located in Bank 2, Sensor 4 (downstream of the diesel particulate filter or catalytic converter). This sensor monitors exhaust temperature to protect components and optimize emissions. A low circuit condition typically means the sensor's resistance is too low (shorted internally) or the signal wire is shorted to ground. This can lead to incorrect temperature readings, potentially causing regeneration issues in diesel engines or reduced performance in gasoline engines.
01. Most Common Causes
- Faulty exhaust gas temperature sensor (Bank 2 Sensor 4)
- Short to ground in the sensor signal circuit
- Damaged wiring or connector due to heat or corrosion
- ECM internal fault (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel efficiency
- Possible limp mode or reduced engine power
- Failed emissions test
03. Step-by-Step Diagnosis
Step 1: Connect a scan tool and verify the code P2475. Check for additional codes related to EGT sensors.
Step 2: Visually inspect the wiring and connector for Bank 2 Sensor 4 for damage, corrosion, or melting.
Step 3: Disconnect the sensor and measure its resistance with a multimeter. Compare to manufacturer specifications (typically 100-200 kΩ at room temperature).
Step 4: Check for short to ground by measuring resistance between the signal wire and chassis ground (should be infinite).
Step 5: If sensor and wiring are okay, test the ECM output by backprobing the signal wire with ignition on (should see a reference voltage, usually 5V).
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe for short distances, but prolonged driving may cause reduced performance, increased emissions, and potential damage to the DPF or catalytic converter. It's best to diagnose and repair promptly.
How much does it cost to fix?▼
The cost typically ranges from $150 to $300, including parts (sensor $50-$150) and labor (1-2 hours at $100-$150 per hour).