What Does P2631 Mean?
The oxygen sensor pumping current trim circuit voltage for Bank 2 Sensor 1 is reading higher than expected range. This indicates excessive voltage or open circuit in the wide-band sensor's pumping cell control circuit on Bank 2.
Common Causes
40%
Faulty oxygen sensor with open pumping cell circuit
30%
Open circuit or high resistance in O2 sensor wiring
20%
Corroded or loose sensor connector terminals causing high resistance
7%
PCM internal circuit fault causing excessive voltage output
3%
Damaged sensor due to contamination or overheating
Diagnostic Steps
1
Step 1: Inspect Bank 2 O2 sensor connector for corrosion, bent pins, or moisture damage
2
Step 2: Test continuity of pumping current circuit wiring from sensor to PCM (should be less than 5 ohms)
3
Step 3: Measure pumping cell internal resistance at sensor (should be 2-4 ohms; infinite = open circuit)
4
Step 4: Check for exhaust leaks near Bank 2 sensor that could affect operation
5
Step 5: Replace sensor if resistance is open or out of range; test PCM if wiring and sensor are good
Estimated Repair Cost
$200 - $650
Parts + labor, varies by vehicle and location
The oxygen sensor pumping current trim circuit voltage for Bank 2 Sensor 1 is reading higher than expected range. This indicates excessive voltage or open circuit in the wide-band sensor's pumping cell control circuit on Bank 2.
The most common cause of P2631 (O2 Sensor Pumping Current Trim Circuit High Bank 2 Sensor 1) is: Faulty oxygen sensor with open pumping cell circuit
Typical repair costs for P2631 range from $200 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but Bank 2 may run lean causing hesitation, power loss, and potential engine damage if prolonged. Repair soon to prevent catalyst damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2631 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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