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P2631 Generic (SAE) Basic entry

O2 Sensor Pumping Current Trim Circuit High

Updated 2026-10-02 · Fuel, air & emissions (P2)

Severity
Medium
Typical repair cost
40 – 350 EUR
System
Powertrain

What it means

P2631 is stored when the engine control module measures a voltage in the O2 Sensor Pumping Current Trim circuit above the expected maximum, typically because the signal wire is shorted to battery voltage or the circuit is open and pulled up internally.

This entry is compiled automatically from the standard definition and typical diagnostic practice for this type of fault. A detailed, reviewed article is in preparation.

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Symptoms

  • Check engine light on
  • Rough or unstable idle
  • Hesitation or poor acceleration
  • Increased fuel consumption
  • Possible limp mode with reduced power

Common causes

  1. Damaged, chafed or corroded wiring in the O2 Sensor Pumping Current Trim circuit
  2. Corroded, loose or water-damaged connector terminals
  3. Failed O2 Sensor Pumping Current Trim component (sensor, solenoid or actuator)
  4. Poor ground connection for the module or component
  5. Faulty control module driver (rare, confirm all else first)

How to diagnose

  1. Read freeze frame data and note when the code set (cold start, under load, after rain)
  2. Inspect the O2 Sensor Pumping Current Trim connector for bent pins, corrosion and water; wiggle the harness with the engine running and watch live data
  3. Measure supply voltage and ground at the connector with the key on
  4. Check the signal wire for shorts to ground or battery and for continuity to the control module
  5. Test or substitute the O2 Sensor Pumping Current Trim only after wiring and connectors are confirmed good
  6. Clear the code and complete a drive cycle to confirm the repair

Frequently asked questions

Can I keep driving with P2631?

Usually yes for a short time, but expect reduced performance or higher fuel use. Have it diagnosed within a few days.

Will clearing P2631 fix it?

No. Clearing only erases the stored code; it returns as soon as the monitor runs again unless the cause is repaired.

Related codes

P2627P2628P2630

Nearby codes in this group