O2 Sensor Pumping Current Trim Circuit Low Bank 2 Sensor 1
The P2630 code indicates that the Engine Control Module (ECM) has detected a low voltage or current condition in the pumping current trim circuit of the oxygen sensor located on Bank 2, Sensor 1 (upstream of the catalytic converter). This sensor is a wideband air-fuel ratio sensor that uses a pumping current to measure oxygen content. A low circuit condition suggests a short to ground, open circuit, or a failing sensor, which can cause incorrect air-fuel mixture readings and affect engine performance and emissions.
01. Most Common Causes
- Faulty oxygen sensor (Bank 2 Sensor 1)
- Open or shorted wiring in the sensor circuit
- Corroded or damaged connector
- ECM failure (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Poor fuel economy
- Rough idle or hesitation
- Failed emissions test
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm the code and check for additional codes.
Step 2: Visually inspect the O2 sensor wiring and connector for damage, corrosion, or loose connections.
Step 3: Measure the sensor's signal voltage and compare to manufacturer specifications.
Step 4: Test the sensor's heater circuit and pumping current circuit with a multimeter.
Step 5: If wiring and voltage are normal, replace the oxygen sensor.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
You can drive short distances, but it may cause poor performance and increased emissions. Prolonged driving can damage the catalytic converter.
How much does it cost to fix?▼
Replacing the oxygen sensor typically costs $200-$400 including parts and labor.