P2628 Fault Code

O2 Sensor Pumping Current Trim Circuit High Bank 1 Sensor 1

• What does that mean?
• Symptoms
• Causes
• Solutions

The O2 Sensor Pumping Current Trim Circuit High Bank 1 Sensor 1 fault code indicates that there is an issue with the circuit responsible for supplying the necessary current to the oxygen sensor located at bank 1, sensor 1. This sensor plays a key role in monitoring the exhaust gases and ensuring the fuel mixture is optimal for combustion. If the current supplied exceeds the manufacturer's specifications, it can trigger this fault code.

What are the symptoms of the P2628 code?

Drivers may experience several symptoms when this fault code is triggered:

• Poor fuel economy due to incorrect air-fuel mixture.
• Increased emissions, potentially resulting in failing an emissions test.
• Rough idling or engine misfires when the engine is running.
• The check engine light illuminating on the dashboard.

What causes the P2628 code?

Possible causes of this fault code include:

• A malfunctioning oxygen sensor that is drawing too much current.
• Wiring issues such as short circuits or open circuits in the electrical connections.
• Corrosion or damage at the sensor connector or wiring harness.
• Problems within the Engine Control Module (ECM) that may affect the sensor's performance.

How to fix P2628?

To resolve the O2 Sensor Pumping Current Trim Circuit High Bank 1 Sensor 1 fault code, follow these steps:

• Inspect the wiring and connectors related to the oxygen sensor for any damage, corrosion, or loose connections. Repair or replace as necessary.
• Test the oxygen sensor using a multimeter to ensure it operates within the manufacturer's specifications. Replace the sensor if it fails the test.
• Check the ECM for any software updates or issues that may be causing incorrect sensor readings. Reprogram or replace the ECM if required.
• Clear the fault code and perform a test drive to confirm that the issue is resolved.