Error Code P0C78: What It Means & What To Do?

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Stressed? Don’t know how what to do? See the error code P0C78? No worries! We are here to guide you! Well, it should be noted that there are six power transistors (IGBTs) each for MG1 and MG2 present in the inverter. The inverter performs the task of modifying the high-voltage direct current from the HV battery into three-phase alternating current for generator (MG1) and motor (MG2). Besides this, it also alters three-phase alternating current transferred by generator (MG1) and motor (MG2) into direct current for the HV battery. The MG ECU constantly regulates and controls the actuation of the power transistors (IGBTs). All the information imperative for the control is transmitted by the inverter such as amperage and voltage to the MG ECU.The high voltage system further is monitored by two high voltage contractors that function like switches for the high voltage battery. It can be observed that while the vehicle is turned off, both switches are open. As soon as the vehicle turns on, the first switch (pre-charge switch) shuts down permitting the high voltage to start powering up the rest of the vehicle. If the first switch fails to function correctly the code P0C78 is set.

It can be seen that the high voltage system is regulated by two high voltage contractors that perform the role of switches for the high voltage battery. Also, both switches are open when the vehicle is turned off. Whereas when the vehicle is turned on, the first switch (pre-charge switch) shuts down. This enables the high voltage to start powering up the rest of the vehicle too. The code P0C78 sets in whenever the first switch fails to function in the required order.

What causes this problem with the Hybrid Battery System Precharge Time Too Long?

• A malfunctioning inverter with converter assembly
• Inverter with converter assembly harness disconnected or shorted
• A bad electrical connection in the inverter with converter assembly circuit
• A possible fault in the power management control ECU

1. Converter Assembly - This is one of the key components of the exhaust system of the car. A malfunctioning one causes problems like the engine misfiring (this is a dangerous condition as it often melts the catalyst components) and a significant decrease in power while accelerating. So we recommend you to get your converter assembly changed right away ny simply logging into Parts Avatar.
2. Converter Assembly Harness - Weary and damaged converter assembly harness can often be problematic. Not only this, it can also gradually with time affect the overall functioning of the vehicle. So to add some spark to your ride you definitely need the perfect quality converter assembly harness offered at Parts Avatar. Isn’t that just the perfect deal?
3. Control ECU - Is your engine running roughly or inconsistently? Well, a defective control ECU significantly affects the performance of the engine. Get your error coed fixed instantly with Parts Avatar. We not only offer good quality products but also provide services that can make your day. What are you waiting for?
4. Generator - Experiencing flickering headlights? Or observe stalling or strange noises while driving? Well, all this triggered due to a faulty generator. It’s strongly advised to change or repair a malfunctioning generator immediately to fight the problems caused by the error code P0C78.

Our main motive is to achieve customer satisfaction and that’s why we will help you to diagnose P0C78 code by mentioning some major symptoms below:

Common Symptoms

• The engine light on (or service engine soon warning light)

Have a look at some ways with which you can correct the P0C78 code:

• Start with a visual inspection of all the components in the system. Repair or replace a damaged inverter with converter assembly
• Mend or restore a defective inverter with converter assembly harness that is either corroded or disconnected
• Measures should be taken to fix a bad electrical connection running in the inverter with converter assembly circuit
• Change or restore a distorted power management control ECU right away

There is no need to get strained if your OBD Code is still flashing up as we are here at your service. Have a look at our superior variety of converter assembly, converter assembly harness, control ECU, generator, hybrid voltage system parts, assembly converter, torque converter and many more. Now all your problems would vanish within no time.

Want to diagnose the error code P0C78? Well, then you should follow these steps in order to diagnose this fault code:

To begin an accurate diagnosis, make use of a standardized OBD-II trouble code scanner. The scanner should be utilized to check and confirm the code and view the freeze frame data by a qualified mechanic. The mechanic should also check for additional trouble codes stored. After the repairs have been performed, the codes should be cleared and the vehicle should be test driven to see if the code reappears. If the code disappears it could likely be due to a faulty diagnose or may signify an intermittent issue.

Common Mistakes When Diagnosing the P0C78 Code

While performing a diagnosis is it necessary to avoid certain mistakes. Only for our customers we have listed here a few common mistakes that should be avoided while diagnosing the error code P0C78:

• A defect in the pre-charge contractor
• A damaged starter/generator control module
• Problems due to wiring in the system