O2 Sensor Pumping Current Trim Circuit High Bank 2 Sensor 1
The P2631 code means the vehicle's onboard diagnostic system has detected: O2 Sensor Pumping Current Trim Circuit High Bank 2 Sensor 1. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $150 - $500 (parts and labor)
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What Are the Symptoms of P2631?
- Bank 2 running lean
- Hesitation from bank 2 cylinders
- Higher exhaust temperatures on bank 2
- Check engine light on
What Causes P2631? (Most Likely First)
- Bank 2 wideband O2 sensor degraded Very High
- Short to voltage in bank 2 sensor circuit High
- Bank 2 sensor contaminated by coolant Moderate
- ECM bank 2 driver stuck high Low
Can I Still Drive with P2631?
Short distances only. P2631 is rated moderate severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
Can a lean bank 2 cause engine damage?
Prolonged lean operation on bank 2 can cause elevated exhaust temperatures, potentially damaging catalytic converters and in extreme cases, causing cylinder damage.
What does coolant contamination on an O2 sensor look like?
A white or crystalline coating on the sensor tip indicates coolant has reached the exhaust system, usually from a head gasket leak or cracked head.
Will P2631 cause a failed emissions test?
Yes. The incorrect bank 2 readings will cause improper fuel trim, likely resulting in high NOx emissions from the lean condition.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P2631?
-
Monitor bank 2 pumping current for high readings
-
Check bank 2 wiring for short to power
-
Inspect bank 2 sensor tip for contamination
-
Test ECM bank 2 O2 output
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
Which Vehicles Commonly Get P2631?
- 2010-2020 Toyota Highlander V6
- 2012-2019 Honda Pilot V6
- 2008-2018 Ford Explorer V6
- 2011-2020 Chevrolet Traverse V6
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