P2088: Exhaust Gas Temperature Sensor Circuit High Bank 2 Sensor 2
The P2088 code indicates that the Engine Control Module (ECM) has detected a high voltage signal from the exhaust gas temperature (EGT) sensor located after the diesel particulate filter (DPF) on bank 2. This sensor monitors exhaust temperature to protect the DPF and catalytic converter. A high voltage reading typically means the sensor circuit has an open, short to power, or a faulty sensor. This can lead to incorrect exhaust temperature readings, affecting DPF regeneration and potentially causing emissions issues.
1. Most Common Causes
- Faulty exhaust gas temperature sensor
- Open or short to power in the sensor circuit
- Corroded or damaged connector
- ECM software or hardware issue
2. Symptoms You Will Notice
- Check Engine Light on
- Reduced fuel economy
- Possible DPF regeneration issues
- Exhaust odor or smoke
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the EGT sensor and wiring for damage or corrosion.
Step 3: Test sensor resistance and voltage with a multimeter; compare to manufacturer specs.
Step 4: Check for shorts to power or ground in the circuit.
Step 5: If sensor and circuit are okay, update ECM software or replace ECM.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as incorrect exhaust temperature readings can damage the DPF or catalytic converter. Short trips to a repair shop are okay.
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.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.