Skip the auto shop - Our mechanics make house calls

P2626 OBD-II Trouble Code: O2 Sensor Pumping Current Trim Circuit/Open Bank 1 Sensor 1

Check Engine Light

P2626 Code Definition

The P2626 code is a generic powertrain code related to computer circuit output issues. This code appears when the engine control module (ECM) has received a voltage signal from oxygen sensor number 1 pumping current trim circuit for bank 1 that is not within the accepted variances. This typically means the engine block contained the number 1 cylinder is impacted and a fault has been found in the sensor ahead of the catalytic converter (upstream sensor or sensor 1).

The P2626 code is related to:

What the P2626 Code Means

If a P2626 code appears, your vehicle’s ECM has received a voltage signal from oxygen sensor number 1 pumping current trim circuit for bank 1 that is not within the accepted variances. This typically means the engine block contained the number 1 cylinder is impacted and a fault has been found in the sensor ahead of the catalytic converter (upstream sensor or sensor 1). After reaching normal operating temperature and the ECM reaches closed-loop operations, upstream heater oxygen sensor readings should vary consistently from 100 to 900 millivolts.

It could also be due to an oxygen sensor reading being lower than allowed variances. When the voltage signal variance exceeds 10%, either high or low, the ECM will store a P2626 code. The ECM uses the signals from the oxygen sensor to monitor if the air and fuel mixture is too rich or too lean and increases or decreases the fuel injection duration. A damaged sensor can cause the air/fuel mixture to be too rich or too lean for the engine’s needs.

What Causes the P2626 Code?

The P2626 code is caused by a number of possible issues, including:

  • Damaged or defective oxygen bank 1 sensor 1
  • Damaged, defective, shorted, or open sensor harness
  • Damaged or defective oxygen sensor electrical connectors
  • Faulty or blown fuse for the oxygen sensor
  • Too low or too excessive fuel pressure
  • Possible vacuum leak in the engine
  • Possible exhaust leak
  • Damaged or defective oxygen sensor 1
  • Damaged or faulty ECM (rare)

What are the Symptoms of the P2626 Code?

The symptoms of a P2626 code may include:

  • Warning or Check Engine Light illuminated
  • Possible sputtering or stalling at engine idle
  • Vehicle hesitation during acceleration
  • Poor fuel efficiency
  • Tailpipe may produce black smoke

How Does a Mechanic Diagnose the P2626 Code?

A mechanic may use a variety of methods to diagnose a P2626 code, including:

  • Use an OBD-II scanner to check for a stored P2626 code in the ECM
  • Perform a visual inspection of all wires and connections
  • Check for any damaged or burned wiring harnesses
  • Remove the oxygen sensor, if possible and check for signs of damage
  • Check the sensor readings through the use of a digital volt or ohmeter
  • Test voltages to individual oxygen sensor heater circuits, including both power and ground
  • Clear all codes and test drive the vehicle to see if they reappear

Common Mistakes when Diagnosing the P2626 Code

One common mistake when diagnosing the P2626 code is replacement of the incorrect sensor. Additionally, overlooking and not repairing or replacing damaged wires can result in multiple replacements of the oxygen sensor or related parts. Finally, replacing the oxygen sensor when lean or rich air/fuel mixtures are the actual reason for the code.

How Serious is the P2626 Code?

Because a P2626 code stored in your ECM could result in your vehicle stalling or hesitating during acceleration, causing dangerous driving conditions, YourMechanic considers this a potentially serious issue. Take your vehicle into your local dealer service center of repair shop for diagnosis and repair immediately.

What Repairs can Fix the P2626 Code?

Need Help with a P2626 Code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Shutterstock.com Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....
How to Get a Louisiana Driver's Permit
s licensing program. The first step in this program is to obtain...


Related questions

Q: Multiple trouble codes, no spark, no start.

You are getting codes to each and every major sensor on the engine that is needed to run your motor. You either have a major malfunction with the ECU or a problem with the harness not being wired correctly. You...

Q: Could a problem with the knock sensor keep my car from starting?

Hi there. A problem with the knock sensor or knock sensor circuit can definitely make starting a vehicle more difficult. A knock sensor is used by engineers to help the engine's computer sense possible internal engine failure before it becomes...

Q: 2006 Kia spectra stops shifting seemingly randomly.

Hi there. The transmission may have a failed harness or a failed computer (TCM). With having all of the shift solenoids and the torque converter clutch not functioning correctly, then there is a connection error. Remove the harness to the...