Scenario
The customer is driving an LR Discovery Sport Mild Hybrid vehicle and receives a warning on the dashboard that says “Charging system fault.” Depending on the state of charge, the battery light may also be on. This fault is also an issue across several JLR vehicles (see list below)
The vehicle arrives at the local garage, and they read the faults using their new Opus IVS DrivePro 2 diagnostic machine.
The faults logged are in the GWM gateway module
• P0658-16 Generator control circuit range/performance voltage below threshold.
The technician working on the car checks the voltage output from the Starter/generator and finds it’s not charging the 12V system. He makes the diagnosis using the evidence he has gathered that the Starter/generator is faulty.
A new Starter/generator was ordered and fitted to the vehicle, and the faults were cleared using the Drive Pro 2
On starting the vehicle, the warning reoccurs on the dashboard. On reading the faults, the same fault has relogged, and the Starter/generator is still not charging.
The technician working on the car decides he will give the Opus IVS 360 team a call and see if he can get some help on the car.
The case is picked up by one of the Opus IVS 360 LR master technicians, and he goes to work diagnosing the fault.
First, the Opus technician logged into the garage’s Drive Pro 2 and carried out the first of 2 remote services to help this customer.
Using the JLR dealer tool, Topix cloud, the Opus technician remotely connected to the car via the Drive Pro 2 and got to work checking some live data in the DC-to-DC converter.
The 2 PID’s are called:
• DC to DC Conversion System Currently Active Operating MODE 495A
• DC to DC Conversion System Requested Operating MODE 4959.
On checking these, we found the following information
These two pieces of data confirm the DC-to-DC converter is faulty. On these cars, the DC-to-DC converter directly charges the 12v battery as well as the 48V system.
After explaining this to the technician working on the car, a plan was made to replace the DC-to-DC converter. We advised the technician that this component would require programming and coding after fitment to bring it into service.
After replacement of the unit, adhering to all the manufacturer’s instructions, the mechanic connected the Drive Pro2 and called the Opus IVS 360 team to code and program the unit, bringing it into service and clearing all fault codes.
Once complete the Opus IVS 360 technician advised on road testing and checking the car. On completion of testing the car is functioning correctly and the 12v battery is charging correctly.
JLR models with the same mild hybrid system are:
Jaguar MHEV 2021 onwards:
Vehicles in BOLD are known to suffer from this fault.
F-PACE
2.0 AJ20 P4H PHEV
2.0 AJ20 P4M
2.0 AJ21D4M
3.0AJ20 P6H
3.0 AJ20 D6H
E-pace
1.5AJ20 P3H
1.5 AJ20 P3H PHEV
2.0 AJ21 D4M
2.0 AJ20 P4H PTA
2.0 AJ20 P4m
XE
1.5AJ20 P3H
2.0 AJ20 P4H
2.0 AJ21 D4M
XF
2.0 AJ20 P4H
2.0 AJ20 P4M
2.0 AJ21 D4M
Land Rover
Discovery 5 2021 on
2.0 AJ20 P4H
3.0 AJ20 P6H
3.0 AJ20 D6H
Defender 2020 on
2.0 AJ20 D4H
2.0 AJ20 P4H
3.0 AJ20 D6H
3.0 AJ20 P4H
Velar 2021 on
2.0 AJ20 D4H
2.0 AJ20 P4H
3.0 AJ20 D4H
3.0 AJ20 P4H
Range Rover L405 2021 onwards
3.0 AJ20 D4H
3.0 AJ20 P4H
Range Rover Sport L494 2020 onwards
3.0 AJ20 D4H
3.0 AJ20 P4H
2.0 AJ20 P4H
Discovery Sport 2020 on
2.0 AJ20 P4H
2.0 AJ20 P4M
2.0L I4 AJ200 DSL HGH
2.0L I4 AJ200 DSL MID
Range Rover Evoque 2020 on
2.0 AJ20 P4H
2.0 AJ20 P4M
2.0L I4 AJ200 DSL HGH
2.0L I4 AJ200 DSL MID