O2 Sensor Pumping Current Trim Circuit High Bank 2 Sensor 1
The P2631 code indicates a high voltage condition in the pumping current trim circuit of the oxygen sensor located on Bank 2, Sensor 1 (upstream of the catalytic converter). This circuit is part of the air-fuel ratio sensor (wideband O2 sensor) that measures oxygen content in the exhaust. A high signal suggests a short to voltage, open circuit, or a faulty sensor, which can cause incorrect fuel trim adjustments and poor engine performance.
01. Most Common Causes
- Faulty Bank 2 Sensor 1 oxygen sensor
- Short to voltage in the sensor wiring or connector
- Open circuit in the sensor signal or heater circuit
- Damaged engine control module (ECM)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Decreased fuel economy
- Rough idle or hesitation during acceleration
- Failed emissions test
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and record freeze frame data.
Step 2: Visually inspect the Bank 2 Sensor 1 wiring and connector for damage, corrosion, or loose pins.
Step 3: Using a multimeter, check the sensor signal voltage and compare to manufacturer specifications.
Step 4: Test the sensor heater circuit for proper resistance and voltage supply.
Step 5: If wiring and voltage are normal, replace the Bank 2 Sensor 1 oxygen sensor.
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 cause poor fuel economy and potential damage to the catalytic converter. Short trips to a repair shop are acceptable.
How much does it cost to fix?▼
The cost typically ranges from $200 to $400, including parts and labor. The sensor itself costs $100-$250, and labor adds $100-$150.