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 signal from the exhaust gas temperature (EGT) sensor located in Bank 1, Sensor 5 (typically downstream of the diesel particulate filter or selective catalytic reduction system). This sensor monitors exhaust temperature for emissions control and regeneration events. A low circuit condition can be caused by a faulty sensor, wiring issues (short to ground), or a poor connection. If left unresolved, it may lead to incorrect regeneration cycles, reduced fuel efficiency, or potential damage to exhaust components.
01. 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 (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel economy
- Possible limp mode or reduced engine power
- Failed emissions test
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data to confirm P2481.
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 (typically 100-200 kΩ at cold).
Step 4: Check for short to ground by disconnecting sensor and measuring voltage at harness connector (should be ~5V reference).
Step 5: If sensor and wiring are okay, test ECM output or perform a sensor replacement.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally not recommended to drive long distances with this code, as it can cause improper regeneration of the DPF, leading to clogging and expensive repairs. Short trips may be okay, but you should address it promptly.
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.