2025 hybrid hard start check engine P0C79

[fuego]

Trucks been amazing so far. Just today as I got out of work and started the truck it make some horrible noises. It felt like it kept trying to start really hard and over and over again and lotso vibration and spinning noise. I immediately powered off and waited to start it back up. Everything is normal but check engine light is on.

Checked with my OBD reader and got the code P0C79. Drive Motor “A” Inverter Voltage Too High. Just shy of 7k miles on the clock.

What does this mean? Is it safe to drive? Yes I’ve setup an appointment via the Ford app. If you have any experience with this please let me know what went wrong and how it was fixed. I don’t like this bc the vehicle is new and I bought it outright. Also didn’t see this code for maverick on the internet.

Thanks in advance.

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[OleFordGuy]

According to online search (copy/paste)

OBD-II code P0C79 is an urgent diagnostic trouble code indicating that the voltage from the Drive Motor “A” inverter is too high. This issue is commonly monitored by the Transmission Control Module (TCM), which compares the actual voltage to the requested voltage from the Battery Energy Control Module (BECM).

What Does the P0C79 Code Mean?

The P0C79 code signifies a malfunction in the electric vehicle’s power management system, specifically relating to the inverter voltage. This can lead to performance issues and may compromise the vehicle’s operation.

What Causes the P0C79 Code?

The primary causes of the P0C79 code include:

Battery Energy Control Module (BECM) failure
Wiring issues that disrupt the voltage signal
These issues can prevent the proper functioning of the drive motor, leading to a potential breakdown or unsafe driving conditions.

What Are the Symptoms of the P0C79 Code?

Symptoms associated with the P0C79 code may include:

Reduced power or performance from the vehicle
Warning lights on the dashboard
Increased energy consumption
Possible overheating of the inverter
How Serious Is the P0C79 Code?

The P0C79 code is classified as urgent, meaning immediate attention is necessary. If not addressed, this issue can lead to severe damage to the vehicle’s electrical system or create hazardous driving conditions.

 

[fuego]

Yup. I may be the only one. Dealers didn’t see anything like this.

Left at the dealer fist thing today. They can’t figure it out. I was hoping to get it by noon. But they’ll have to keep it longer.

Basically went from just fine to not. Like I’ve mentioned after the “incident” it drives fine. Didn’t notice anything other that the little dreaded light.

 

[HeyBales]

Does your scanner allow grabbing the freeze frame data related to the DTC?
I know, too late now - but for future reference.

It could have been a single incident, and bad enough it throws the DTC on just one occurance.
Or it had to happen multiple times and system finally threw one, but then it went away and after enough time with normal readings the DTC would go away too. But that didn't happen yet.

Either way - I'm sure they are engaging Ford corp techs as to what they need to do next - I'm sure a bad lag time will be there, making this drag out.
Now it's a matter of can local tech do whatever is requested well enough.

Hope it's wiring issue, and not actually in the tranny requiring engine/tranny removal to crack it open.

Did you get a loaner or rental - for sure warranty work.

 

[fuego]

So dealer can’t figure it out. Truck has been there since Wednesday.
I’d rather have answers than no answers. I don’t want this to happen while I’m driving or out of town and get really stuck. This is super disappointing.

Did you get a loaner or rental - for sure warranty work.

Didn’t get a loaner or rental. Luckily I have a beater car. This dealer didn’t even have a shuttle. but have no choice. Drove several hours to buy this truck to get the best price. But go to the nearest dealer for records.

Does your scanner allow grabbing the freeze frame data related to the DTC?
I know, too late now - but for future reference.

Yes! Didn’t even think to do this. I keep this for my older vehicles I do maintenance on. Didn’t think I’d need to use it on my new vehicle anytime soon.

thanks all. I’ll update if anything changes.

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