Exhaust Gas Temperature Sensor Circuit Low Bank 1 Sensor 5
The P2481 code indicates that the Engine Control Module (ECM) has detected a low voltage condition in the exhaust gas temperature (EGT) sensor circuit for Bank 1, Sensor 5. This sensor is typically located downstream in the exhaust system, often after the diesel particulate filter (DPF) or selective catalytic reduction (SCR) system. A low voltage reading suggests a short to ground, faulty sensor, or wiring issue. This can affect emissions control and may lead to reduced engine performance or limp mode.
1. Most Common Causes
- Faulty exhaust gas temperature sensor
- Short to ground in sensor wiring or connector
- Corroded or damaged sensor connector
- ECM software or hardware issue
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Poor fuel economy
- Increased exhaust emissions
3. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm code P2481 and check for related codes.
Step 2: Visually inspect the EGT sensor and wiring for damage, corrosion, or loose connections.
Step 3: Measure sensor resistance and compare to manufacturer specifications; a short circuit indicates a faulty sensor.
Step 4: Check for voltage at the sensor connector with key on; if voltage is low, trace wiring for shorts or opens.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause reduced performance and potential damage to the exhaust aftertreatment system. Limp mode may limit speed.
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 adds $100-$250 depending on accessibility.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.