Powertrain, generic (extended)

P2674 Injection Pump Fuel Calibration Not Learned

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

Electronically governed diesel injection pumps meter the quantity per stroke themselves, and each unit differs slightly in how much it delivers for a given command. P2674 reports that the quantity correction for the installed pump has not been learned or stored in the controller. No manufacturer documents this code publicly; P2672 and P2673 cover the timing side of the same pump. CARB requires 2015-on vehicles whose fuel pumps or injectors carry production tolerance compensation, such as coded parts or trim resistors, to verify that the right compensation is in use. Without it, fuelling can drift, giving smoke, uneven idle or a shortfall of power until the learn routine is run.

Likely causes

Quantity learn not run after pump or controller replacement
Pump calibration data missing, wrong or not matching the installed pump
Fuel metering actuator fault preventing the learn from completing

Symptoms

  • Check engine light on
  • Smoke or uneven idle
  • Reduced power

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–400
Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

injection pumpcontrol modulefuel quantity solenoid

Related codes

P2672P2673P0251P0252

References: law.cornell.edu, en.wikipedia.org.