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:
What the P2227 code means
- 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
The barometric (BARO) sensor is used by the engine control module (ECM) to measure the pressure of the atmosphere. The pressure is affected by weather conditions, air volume, and altitude. A diaphragm is built into the BARO sensor which opens and closes at different atmospheric conditions. The sensor will translate this activity into an electrical resistance.
The ECM will send the BARO sensor a 5 volt reference. The voltage will be met by the resistance created by the BARO sensor. The BARO sensor will ingest the voltage into its own stomach known as resistance. Voltage being sent back to the ECM will vary depending on the amount of resistance inside the BARO sensor. If the voltage sent back to the ECM is too high or too low, a P2227 code will be set.
After the resistance is applied, the remaining voltage will be sent back to the ECM, which will tell the ECM the atmospheric pressure.
An accurate atmospheric pressure reading is needed to by the ECM to maintain delicate tasks such as fuel delivery.
What causes the P2227 code?
- Faulty MAF (mass air flow) sensor
- Faulty BARO sensor
- Faulty ECM
- Short or open condition in the BARO sensor circuit
- Sticking idle air control valve
- Clogged intake inlet- debris in airbox
- Faulty throttle position sensor (TPS)