Honda P1078: Intake Manifold Tuning (IMT) Valve Stuck in Low RPM Position

Is your scanner showing Honda P1078?
No worries. We'll show you what it means and how to deal with it.

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Honda P1078: Intake Manifold Tuning (IMT) Valve Stuck in Low RPM Position

DIY Difficulty Level
Repair Cost
Can I Still Drive?
Yes (Short-term only)

What Does The Honda P1078 Code Mean?

When the PCM sends an open (short runner) command, no short runner return signal is received for at least 3 seconds. Intake air temperature 5 ºF (-15 ºC), engine speed is 3,800 rpm and battery voltage minimum of 10.5v. DTCs P0107, P0108, P0112, P0113, P0117, P0118, P0563, P1128, P1129, P2227, P2228, P2229 are not active.

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot.

What Are The Potential Causes Of The Honda P1078 Code?

  • Poor connections or loose terminals at the IMT actuator and the PCM
  • “Open” or “Short” circuit between the PCM and the IMT actuator
  • Faulty IMT actuator
  • PCM needs to be updated with the latest software
  • Faulty PCM

Recommended Parts

Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:

>>> WORKPRO 582-piece Crimp Terminals, Wire Connectors, Heat Shrink Tube, Electrical Repair Kit
>>> Honda PCM

Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!

Check This Video For Reference

Reference Sources

Advanced Diagnostics – MotoLogic, 2002 Honda CR-V

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