MG4 long range suddenly throwing multiple errors

M

mgoz

Standard Member
Joined
Dec 30, 2023
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Location
sydney
Driving
MG4 Trophy LR
Was driving from Melbourne to Canberra and decided to turn left off the highway to pull into a recharge station, as I was pulling in the alerts started sounding one after the other. Lane keep assist system unavailable, Forward collision system unavailable, same for Auto emergency braking system, rear drive assist, stability control fault, traction control fault, auto hold fault, brake system fault, hill hold unavailable. Basically everything. I can’t turn on any assists, one pedal driving, cruise control or anything at all. Brakes are hydraulic only and very poor. Turned the car off for a while but the problems persist. Roadside assistance was no help as their scanner didn’t have the MG4 in it anyway. The car will charge and drive but every assist is not functioning. Anyone seen anything like this. I’m hours from anywhere.
 
Do you want this added to hints and tips?

After the car powers up, you'll likely need to reset the steering wheel (1) and reset all the windows (2).

(1) turn the wheel fully to the left, then fully to the right, then return to the centre
(2) fully lower the driver's window, fully raise the driver's window (may need to be done in increments). Repeat for the other 3 windows.

You may also need to reset any preferences you'd made (e.g. for the CUSTOM drive mode, HVAC settings, etc.)
 
I disconnected the 12V battery , waited 10 minutes and reconnected it. I went through the steering and windows calibration, but unfortunately all of the alerts are still there and all assists have failed. I’ll be taking the car to the dealer on Monday.
 
mgoz said:
I disconnected the 12V battery , waited 10 minutes and reconnected it. I went through the steering and windows calibration, but unfortunately all of the alerts are still there and all assists have failed. I’ll be taking the car to the dealer on Monday.
Click to expand...
Have you driven it?
You need to drive it to clear those errors.
 
Last edited:
Hi,

This sounds similar to a previous post I made.

MG4 intermittently will not start

Finally got my car back today. In case anyone happens to ever have the same/similar symptoms, the notes from the service place are "CCU & IMCU not update / madule [sic] failure. Performed software update in CCU & IMCU. Replaced gateway module and retested, junction box FA080/FC077. Cleaned and...
www.mgevs.com www.mgevs.com

Is this similar to what you have?
 
mgoz said:
Was driving from Melbourne to Canberra and decided to turn left off the highway to pull into a recharge station, as I was pulling in the alerts started sounding one after the other. Lane keep assist system unavailable, Forward collision system unavailable, same for Auto emergency braking system, rear drive assist, stability control fault, traction control fault, auto hold fault, brake system fault, hill hold unavailable. Basically everything. I can’t turn on any assists, one pedal driving, cruise control or anything at all. Brakes are hydraulic only and very poor. Turned the car off for a while but the problems persist. Roadside assistance was no help as their scanner didn’t have the MG4 in it anyway. The car will charge and drive but every assist is not functioning. Anyone seen anything like this. I’m hours from anywhere.
Click to expand...
Had the same faults, would clear after the car was turned off for a period of time but eventually reappear. Turned out to be a faulty ABS sensor. The cause was a faulty wire connection that had taken in water. MG replaced both parts under warranty, but it took 4 weeks to get replacement parts here in Denmark.
 

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