Fault code P2674 – injection pump fuel calibration not learned

Fault code P2674 is called “Injection Pump Fuel Calibration Not Learned” but in different programs it may be called differently. This fault designation applies to all vehicles equipped with OBD-II.

Technical description and explained code P2674

Stored code P2674 means that the Powertrain Control Module (PCM) has detected a malfunction. Which is related to the calibration of the fuel injection pump.

Fault code P2674 – injection pump fuel calibration not learned

The injection pump draws low pressure fuel from the fuel tank and converts it to high pressure fuel for the fuel injectors. The injection pump is usually gear-driven and must be properly timed. So that the right injector gets the fuel to the right injector at the right time.

The powertrain control module (PCM) controls the timing of the injection pump. The PCM sets code P2674 when the fuel injection pump timing is outside the factory specifications.

Symptoms of vehicle malfunctions

The main signal that an error P2674 has occurred is the Malfunction Indicator Lamp (MIL) is also known as the CheckEngine Light.

It can also be warning signs such as:

  1. The “Check engine” control lamp on the control panel will light up (the code will be recorded in the memory as a malfunction).
  2. The car engine may run unsteadily.
  3. Floating revolutions, as well as attempts to stall at idle.
  4. The engine may simply not start.

A fuel-related fault should be categorized as a serious code. A stored fault P2674 can suddenly and without warning lead to serious steering problems.

Factors that can cause this error code

The error code P2674 can mean that one or more of the following problems have occurred:

  • Injection pump malfunction.
  • Incorrect procedure of re-training of injection pump.
  • Sometimes the cause is the PCM module itself.

How to fix or reset OBD-2 code P2674

Some suggested steps for troubleshooting and fix the error code P2674:

  1. Read all stored data and error codes with an OBD-II scan tool. To find out when and under what circumstances fault P2674 appeared.
  2. Clear the error codes from the computer memory and test-drive the vehicle to find out if the error appears again.
  3. Check the serviceability of the injection system pump.
  4. If the error code appears again, perform the pump teach-in procedure.
  5. Check power and ground continuity of the Control Module (PCM) with a multimeter.
  6. Evaluate the operation of the Control Module (PCM) following the vehicle manufacturer’s procedure.
  7. Clear the error code from the computer memory again, and test drive the vehicle to determine if the problem has been resolved.

Diagnose and repair of problems

If ECM/PCM power supply codes are present, they must be cleared before attempting to diagnose fault P2674. Also, if injection pump codes are present, they must be eliminated first.

Next, you should connect the scanner to the vehicle’s diagnostic port and retrieve any stored codes and data. Make a note of this information in case the code turns out to be intermittent.

After recording all the necessary information, clear the codes and test drive the vehicle until the code is cleared or the PCM goes into standby mode. If the PCM goes into standby mode, the code is intermittent and will be more difficult to diagnose.

Also, if P2674 is malfunctioning, it is worth paying attention to the pump re-training procedure.

Usually, pump calibration is necessary during its current repair or replacement, in order for the PCM module to adjust the fuel supply correctly. When this error occurs, it is usually the faulty calibration that is often the cause.

On which vehicles does this problem occur most frequently

Fault code P2674 can occur on different vehicles but there are statistics on which brands this occurs most often. Here is a list of some of them:

  • Honda
  • Subaru

Fault code P2674 can sometimes be found with other errors. The most common are the following: P2673, P268A, P268B.


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