P2627 code meaning
O2 Sensor Pumping Current Trim Circuit Low (Bank 1 Sensor 1)
Powertrain system Generic code P26xx codes Check engine light
What P2627 means
P2627 marks a trim signal below its plausible range at the first wide-band probe of bank 1. On Ford gasoline engines with NTK probes the interface chip sets it when the resistor line (RL) is open or touches ground; Bosch-equipped Fords do not use it. Honda-built 3.5 L V6 engines in GM's 2005 tables read a label resistor instead and log P2627 when its voltage stays above 4.7 V for 5 s, so the naming follows the resistor value rather than the voltage. On GM diesels the code covers the oxygen signal of the NOx sensor behind the turbine: the 2020 table fails readings below -4 percent in 200 of 250 samples, type B. GM's PIP5468D for 2017-18 Silverado and Sierra with the 6.6 L L5P links P2627 to loose charge-air ducts. Open trim is P2626, high is P2628, bank 2 low is P2630.
P2627 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.3 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2627
- Check engine light
- Further oxygen or NOx sensor codes stored at the same time
- On diesels possibly boost or aftertreatment codes and reduced power
Common causes of P2627
- Most likelyTrim/resistor line open or chafed to ground between probe and engine module
- PossibleWide-band probe or NOx sensor internally faulty
- PossibleLoose or leaking charge-air ducts on diesel engines (GM L5P)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Oxygen sensor bank1 sensor1Sensor calibration resistorNox sensorOxygen sensor wiring
What each part of P2627 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 6 | Area: computer (engine control module) and output circuits. |
| 27 | The exact fault in that area. |
What to do next
- Note P2627 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2627
What does P2627 mean?
P2627 means "O2 Sensor Pumping Current Trim Circuit Low (Bank 1 Sensor 1)". P2627 marks a trim signal below its plausible range at the first wide-band probe of bank 1. It is a generic code, so it means the same on every make.
Is it safe to drive with P2627?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2627 fail an emissions test?
Yes, it can. P2627 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2627 to fix?
Difficulty: medium. A typical repair takes 0.3 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2627 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.