What Does P2630 Mean?
The oxygen sensor pumping current trim circuit voltage for Bank 2 Sensor 1 is reading lower than expected range. This indicates insufficient voltage in the wide-band sensor's pumping cell control circuit on the Bank 2 side.
Common Causes
40%
Faulty oxygen sensor with shorted or degraded pumping cell
30%
Short to ground in O2 sensor wiring or connector
15%
Low battery voltage or charging system issue
10%
PCM internal circuit short or driver failure
5%
Excessive resistance in sensor power supply circuit
Diagnostic Steps
1
Step 1: Verify battery and charging system voltage (12.4V+ key off, 13.5-14.5V running)
2
Step 2: Check for short to ground in Bank 2 pumping current circuit using ohmmeter with sensor disconnected
3
Step 3: Measure O2 sensor pumping cell resistance (typically 2-4 ohms per specifications)
4
Step 4: Inspect sensor heater circuit and verify proper voltage supply to Bank 2 sensor
5
Step 5: Replace sensor if resistance is out of spec; diagnose PCM output circuit if sensor tests 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 lower than expected range. This indicates insufficient voltage in the wide-band sensor's pumping cell control circuit on the Bank 2 side.
The most common cause of P2630 (O2 Sensor Pumping Current Trim Circuit Low Bank 2 Sensor 1) is: Faulty oxygen sensor with shorted or degraded pumping cell
Typical repair costs for P2630 range from $200 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive but Bank 2 will run rich, increasing fuel consumption and emissions. May cause spark plug fouling on that bank.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2630 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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