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)
Best-selling code reader on Amazon. Reads and clears check engine codes on any 1996+ vehicle. Under $30.
Check Price on AmazonAffiliate link -- we earn a commission at no extra cost to you.
Essential for diagnosing sensor codes, checking voltage, and testing circuits. Under $15 and pays for itself on the first job.
Check Price on AmazonAffiliate link -- we earn a commission at no extra cost to you.
Common Symptoms
- Bank 2 running lean
- Hesitation from bank 2 cylinders
- Higher exhaust temperatures on bank 2
- Check engine light on
Probable Causes (Ranked by Likelihood)
- 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
Step-by-Step Diagnostic Procedure
-
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
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.
Sources
This page is built from documented references. Verify against your own service info before repair work.
Explore More
Was this helpful?
Share carcodefinder.com with a friend who needs to decode their check engine light.