P2630: O2 Sensor Pumping Current Trim Circuit Low Bank 2 Sensor 1
What to do
Normal driving with slightly worse economy, and emissions monitors that do not complete. Ask for the whole sensor loom to be inspected rather than the single circuit, and for whatever caused the damage to be dealt with as well — this bank's wiring is usually the more awkward of the two to reach, and it is not a job to repeat. The testing warnings at P2626 apply here too.
What this code means
The pumping current trim circuit reads below its valid range on the bank 2 upstream sensor — normally a short to ground. The mechanism is at P2626 and the loom argument at P2627.
As at P2629, this bank's routing is often the hotter and more awkward of the two, which makes chafed and heat-hardened insulation a likelier finding here than on bank 1. A repair that restores the conductor without addressing why it rubbed through will produce the same code again, which on a loom this awkward to reach is a repair nobody wants to do twice.
Likely causes
Start here
- Wiring shorted to ground · moderate
- Heat damage to sensor or wiring · moderate
- Damaged wiring harness · moderate
Less common
- Faulty oxygen sensor · moderate
- Corroded or loose connector · easy
Symptoms
Components involved
Information, not instruction
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Community experience
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