What Does P2628 Mean?
The oxygen sensor pumping current trim circuit voltage for Bank 1 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.
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 O2 sensor connector for corrosion, bent pins, or moisture; clean and apply dielectric grease if needed
2
Step 2: Test continuity of pumping current circuit wiring from sensor connector to PCM
3
Step 3: Measure pumping cell resistance at sensor (should be 2-4 ohms typically; open = infinite resistance)
4
Step 4: Check for exhaust leaks near sensor that could affect readings or damage sensor
5
Step 5: Replace sensor if resistance is open or out of spec; test PCM output voltage if wiring and sensor test 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 higher than expected range. This indicates excessive voltage or open circuit in the wide-band sensor's pumping cell control circuit.
The most common cause of P2628 (O2 Sensor Pumping Current Trim Circuit High Bank 1 Sensor 1) is: Faulty oxygen sensor with open pumping cell circuit
Typical repair costs for P2628 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 engine may run lean causing hesitation and possible engine damage if prolonged. Repair soon to prevent catalytic converter damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2628 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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