2 month old ZS EV LR - several faults and now HV Battery Shut Off

[RhythMick]

Since buying my MG ZS EV late February I've had minor faults appear on I would say 3 out of every 4 journeys. They don't stop me using the car but they stop ACC from functioning.

• Auto Emergency Braking System Unavailable
• Pedestrian Auto Emergency Braking Unavailable
• Vehicle Control System Fault

Not very worrying as I say. However today the car shut down completely mid journey with ...

• HV Battery Shut Off

Fortunately the car stopped in a relatively safe place - Christ knows what would happen if that was on a motorway! Several attempts to restart the car failed, taking it through stop, lock, wait, unlock, start (foot firmly on brake). RAC were called out and the guy was able to get it going by ...

• Plug in computer to car port
• Check and clear all faults
• Remove negative terminal from battery
• Wait 10 minutes
• Reattach negative terminal
• Restart car normally

Since the above I haven't had a reoccurence of the minor errors but we'll see what happens over the coming days. The car is booked into my local MG dealer in May to investigate the minor faults. Needless to say this has shaken my confidence in the MG. I hate to imagine my wife using the car by herself on the motorway and the HV battery shutting off, bringing the car to a fault.

Has anyone else had this issue? I will contact the dealer tomorrow and get their advice, but I want to know what caused this and whether it's likely to happen again.

 

[RhythMick]

RAC report ...

• Attended vehicle for cut out non restart, RACscan for fault codes, numerous codes recorded, reset codes and performed battery reset, vehicle now goes into ready mode and drives, followed to members home address where they will contact dealership in morning.

Diagnostic codes​

ELECTRO DRIVE

• Name:GEAR SHIFT CONTROL UNIT - SCU
• DTC:U0594-81,Electrical park status

ELECTRO DRIVE

• Name:ELECTRIC VEHICLE COMMUNICATION CONTROLLER - EVCC
• DTC1FF4-1E,Connection confirm (CC) to OBC
• DTC1FF6-1E,Connection confirm (CC) 2 to BMS
• DTC:U2000-04,ECU hardware

ELECTRO DRIVE

• Name:BATTERY MANAGEMENT SYSTEM - BMS
• DTC:U0146-87,Lost Communication With Gateway
• DTC1F10-87,Lost communication with off-board charger module
• DTC1E9B-00,Charging coupler connection status sense value out of range
• DTC1F65-00,On-board charge socket failure hardware

ELECTRO DRIVE

• Name:COMBINED CHARGING UNIT - CCU
• DTC1FC0-03,OBC will stop due to the control pilot (CP) PWM is overtime
• DTC1FC5-96,The temperature sensor in onboard charging socket is faulty

ELECTRO DRIVE

• Name:VEHICLE CONTROL UNIT - VCU
• DTC:U0428-81,Invalid Data Received From Steering Angle Sensor Module (SAS)
• DTC:U18A2-87,BMS_hsc1_frp11(0x2a2) frame timeout
• DTC:U1111-87,Lost communication with battery management system(BMS)
• DTC1BE6-87,BMS module, key message missing
• DTC:U1923-87,Signal invalid for CCU onboard charger plug status
• DTC:U0298-87,Lost communication with high voltage DC/DC module (HVDCDC)
• DTC3042-87,Lost communication with ESS heater
• DTC1B72-00,Torque monitor fault
• DTC1B03-00,Accelerator pedal position sensor, cross check fault
• DTC1B79-29,Inhibited SAS due to data unavailable for FICM
• DTC1B05-12,Accelerator pedal position sensor 2, short circuit to positive

BRAKES

• Name:ANTILOCK BRAKE SYSTEM (ABS)/STABILITY CONTROL SYSTEM (SCS) - ABS/SCS ANTILOCK BRAKE SYSTEM/STABILITY CONTROL SYSTEM/ELECTRIC PARKING BRAKE - ABS/SCS/EPB
• DTC:U0447-81,Invalid data received from gateway (GW)

CHASSIS

• Name:BODY CONTROL MODULE - BCM
• DTC:U1001-87,Lost communication with passive entry & passive start module
• DTC:B1705-96,Lost communication with base station

CENTRAL ELECTRONIC UNIT

• Name:GATEWAY CONTROL MODULE - GW
• DTC:U0245-87,Lost communication with Front infotainment control module (FICM)

TELEMATIC

• Name:TELEMATIC CONTROL MODULE - TBOX
• DTC:B1529-31,Infotainment control module (FICM), communication fault
• DTC:B1533-13,Microphone Input Signal Circuit Open
• DTC:B1534-13,Microphone output, open circuit

SOUND SYSTEM

• Name:FRONT INFOTAINMENT CONTROL MODULE - FICM
• DTC:U1031-87,Lost communication with Infotainment faceplate module (IFP)

AC SYSTEM

• Name:CLIMATE CONTROL - HVAC
• DTC:94C84B,unknown

INSTRUMENT PANEL

• Name:INSTRUMENT CLUSTER - IPK
• DTC:U0245-87,Lost communication with Front infotainment control module (FICM)

DRIVER ASSISTANCE SYSTEM

• Name:FRONTVIEW CAMERA CONTROL MODULE - FVCM
• DTC:U0420-81,Invalid data received from power steering control (EPS) module
• DTC:U130B-81,Invalid data received from front detection radar (FDR)

DRIVER ASSISTANCE SYSTEM

• Name:FRONT DETECTION RADAR - FDR
• DTC:B19C1-81,Adaptive cruise control (ACC) and forward collision warning (FCW) and pedestrian collision warning (PCW) and autonomous emergency braking (AEB) and autonomous emergency braking vulnerable road users (AEB VRU)
• DTC:B19C2-81,Adaptive cruise control (ACC) and autonomous emergency braking (AEB) and autonomous emergency braking vulnerable road users (AEB VRU)
• DTC:B19C3-81,Adaptive cruise control (ACC)
• DTC:B19C4-81,Autonomous emergency braking (AEB) and autonomous emergency braking vulnerable road users (AEB VRU)

DRIVER ASSISTANCE SYSTEM

• Name:AROUND VIEW MONITOR - AVM
• DTC:U0245-87,Lost communication with

 

[Everest]

Has anyone else had this issue? I will contact the dealer tomorrow and get their advice, but I want to know what caused this and whether it's likely to happen again.

S

Thread 'MG5 Trophy Breakdown – A Worrying Experience'

Dec 17, 2024

Hi all,

Long-time reader here! I’ve been driving an MG5 Trophy as a company car for just over 18 months now. Overall, I’ve really enjoyed it – it’s comfortable, drives well, and has been totally reliable… until a few weeks ago when it completely died on me. Buckle up – it’s a bit of a story!

We had a family holiday planned and needed to drive from Wolverhampton to Birmingham Airport, not a huge journey. I got the annual service done 5 days beforehand – no issues flagged at all.

Fast forward to 4 AM on a windy, snowy Friday morning (22nd November). We’re cruising along the...

• stourlad50
• breakdown mg5 mg5 trophy trophy
• Replies: 14
• Forum: MG5 EV Forum

and others - search is your friend.

 

[RhythMick]

Thanks. I did search for similar threads before posting. Most HV battery shut off problems seen to be either relating to start up issues (brake pedal) or charging. This is different - we were moving when the HV shut off. 12V was fine. I couldn't find anything like that.

 

[JohnV6]

Take it back to the dealer. I have had mine since January. It sometimes loses activation or the radio doesn't work well but nothing like your issues

 

[Coulomb]

12V was fine.

How was this determined? It's not a trivial check. A worn out 12V battery would be my first suspicion with that laundry list of fault codes.

Lead acid batteries don't like deep discharges. It may have sat in a car lot or in storage for months and neglected.

 

[decrep]

Or perhaps a loose connection, I guess the RAC has tightened it properly, you may not have any more trouble.

 

[RhythMick]

How was this determined? It's not a trivial check. A worn out 12V battery would be my first suspicion with that laundry list of fault codes.

Lead acid batteries don't like deep discharges. It may have sat in a car lot or in storage for months and neglected.

When I bought it the 12V battery had to be replaced so it's new. RAC checked the health of it. Replacing the battery caused other problems requiring software updates and resets but that was all fixed before I bought it (new).

 

[maskull]

When I bought it the 12v battery had to be replaced so it's new. RAC checked the health of it. Replacing the battery caused other problems requiring software updates and resets but that was all fixed before I bought it (new).

Why did the 12V battery need replacing on a new car ? I would have been wary about buying a new car that needed a repair before buying it . Used or Demo maybe ,but New ?

 

[RhythMick]

Or perhaps a loose connection, I guess the RAC has tightened it properly, you may not have any more trouble.

Why did the 12V battery need replacing on a new car ? I would have been wary about buying a new car that needed a repair before buying it . Used or Demo maybe ,but New ?

The car had been in storage, checks before sale revealed the battery needed replacing.

 

[maskull]

The car had been in storage, checks before sale revealed the battery needed replacing.

Seems fair enough , depending on how long it had been there . Seems strange though that the battery required replacement rather than a recharge .
As @Coulomb posted early it seems your faults could be 12 Volt related . Maybe there's something else going on damaging it .
Hopefully not

 

[Data]

It's not too uncommon to have a 12V battery replaced on a brand new vehicle. It doesn't take long to discharge if the car is stored even for 3-4 weeks. The car has many systems that need power to maintain them. Once it drops to low voltage the battery starts sulphating which permanently damages it. This is why all cars go through a PDI to pick up issues like this & properly prepare the car for the customer. Sounds like the dealer did a good job.

 

[fred12345]

Why RAC, you should have free AA cover with new MG (and annually renewed when you service the car)? Hope you get it all fixed. Update us please.

 

[RhythMick]

Why RAC, you should have free AA cover with new MG (and annually renewed when you service the car)? Hope you get it all fixed. Update us please.

Thanks for that wasn't aware.

 

[RhythMick]

And it's gone again. Bugger.

Booked in to dealers tomorrow. Hope I can get it there with reboots (remove negative terminal).

 

[RhythMick]

HV voltage was 379V. 80% charge