Exhaust Gas Temperature Sensor Circuit High Bank 1 Sensor 4
The P2471 code indicates that the Engine Control Module (ECM) has detected a high voltage signal from the exhaust gas temperature (EGT) sensor located in Bank 1, Sensor 4 (downstream of the diesel particulate filter or catalytic converter). This typically means the sensor circuit has an open, short to voltage, or the sensor itself is faulty. High voltage can result from internal sensor failure, wiring issues, or a poor ground. This code is common in diesel engines with aftertreatment systems.
01. Most Common Causes
- Faulty exhaust gas temperature sensor
- Open or shorted wiring in the sensor circuit
- Corroded or loose connector
- ECM software or hardware issue
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance or limp mode
- Increased fuel consumption
- Possible regeneration issues in diesel engines
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data.
Step 2: Visually inspect the EGT sensor connector and wiring for damage or corrosion.
Step 3: Measure sensor resistance and compare to specifications (typically 100-200k ohms at room temperature).
Step 4: Check for voltage at the sensor signal wire (should be around 0.5-4.5V depending on temperature).
Step 5: If sensor and wiring are good, test ECM output and consider reprogramming or replacement.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can lead to reduced performance, increased emissions, and potential damage to the aftertreatment system. Limp mode may activate.
How much does it cost to fix?▼
The cost typically ranges from $150 to $400, including parts and labor. The sensor itself costs $50-$150, and labor is about $100-$250 depending on accessibility.