What Does P2627 Mean?
The oxygen sensor pumping current trim circuit voltage for Bank 1 Sensor 1 is reading lower than expected range. This indicates insufficient voltage in the wide-band sensor's pumping cell control circuit.
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 affecting sensor power
10%
PCM internal circuit short or driver failure
5%
Excessive resistance in sensor power supply circuit
Diagnostic Steps
1
Step 1: Test battery voltage (should be 12.4V+ with engine off, 13.5-14.5V running)
2
Step 2: Check for short to ground in pumping current circuit wiring using ohmmeter (disconnect sensor first)
3
Step 3: Measure resistance of O2 sensor pumping cell per specifications (typically 2-4 ohms)
4
Step 4: Inspect sensor heater circuit operation and verify proper voltage supply to sensor
5
Step 5: Replace sensor if internal resistance is out of spec; verify PCM output 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 1 Sensor 1 is reading lower than expected range. This indicates insufficient voltage in the wide-band sensor's pumping cell control circuit.
The most common cause of P2627 (O2 Sensor Pumping Current Trim Circuit Low Bank 1 Sensor 1) is: Faulty oxygen sensor with shorted or degraded pumping cell
Typical repair costs for P2627 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 will run rich, increasing fuel consumption and emissions. May foul spark plugs over time.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2627 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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