Having a Honda P1078 code can be extremely frustrating. This code is typically caused by a faulty Intake Manifold Tuning (IMT) valve stuck in the low RPM position. The PCM sends an open (short runner) command and if no quick runner return signal is received for at least 3 seconds, the code will be triggered. This can also be caused by poor connections or loose terminals at the IMT actuator and the PCM, an open or short circuit between the PCM and the IMT actuator, or a PCM that needs to be updated with the latest software.
📢Read also: Honda B1173 Code: TPMS Control Unit Problems
Causes and Solutions to Honda P1078 Code
| Cause | Solution |
|---|---|
| Poor connections or loose terminals at the IMT actuator and the PCM | Check connections and tighten terminals |
| Open or short circuit between the PCM and the IMT actuator | Check wiring and replace if needed |
| Faulty IMT actuator | Replace the IMT actuator |
| PCM needs to be updated with the latest software | Update the PCM software |
| Faulty PCM | Replace the PCM |
Faulty IMT Actuator
The most common cause of the Honda P1078 code is a faulty Intake Manifold Tuning (IMT) valve stuck in the low RPM position. This can cause the PCM to send an open (short runner) command, and if no quick runner return signal is received for at least 3 seconds, the code will be triggered. When this occurs, it is best to replace the faulty IMT actuator.
👀Look at this: Honda P0780 Code
Poor Connections or Loose Terminals
Another cause of the Honda P1078 code is poor connections or loose terminals at the IMT actuator and the PCM. This can cause an open or short circuit between the two components, triggering the code. It is important to check all connections and tighten loose terminals to fix this.
PCM Needs to be Updated
Sometimes, the Honda P1078 code can be caused by a PCM that needs to be updated with the latest software. If this is the case, it is important to update the PCM software to prevent the code from being triggered.
Conclusion
The Honda P1078 code can be caused by various issues, including a faulty IMT actuator, poor connections or loose terminals at the IMT actuator and the PCM, or a PCM that needs to be updated with the latest software. It is important to diagnose the issue and take the necessary steps to fix it, such as replacing the faulty IMT actuator or updating the PCM software. The Honda P1078 Code is an important one to be aware of, as it can cause issues if not addressed.
💥See also: Honda P0796 Code