Hello friends,
I recently created an account here after not being able to figure out the cause of my charging issue. I have been lurking this forum for some time and it has been of great help fixing other issues in the past so I just want to say thanks before going any further. It’s a long read so I hope you can hang in there.
Problem:
When charging at home my Dec 2016 tesla model S using my gen 1 mobile connector on a NEMA 14-50 outlet, the amps try to ramp up to my set point of 24 amps and when it reaches 10 or so amps, it drops down to zero. The car tries to ramp up the amps again and it continually fails. I can hear the mobile connector making a clicking noise. After 3-4 tries the car shows a red light on the charge port and the following errors:
CHG_u014 Charging equipment reports error
CHG_u007 Charging equipment reports error
CHG_f083 Cannot charge-poor grid power possible
Here is the strange part. I get the same errors and red light when I tried two different tesla destination chargers, a third party level 2 charger and a friends gen 2 mobile charger at his home NEMA 14-50 outlet. For these reasons I do not think the issue is my mobile charger or outlet. Supercharging works fine so I suspect its my on-board charger.
Fix attempts:
I am the second owner and purchased the car in Nov. 2020. Soon after getting my NEMA outlet installed in Jan 2021 I was only getting 24 amps instead of the possible 32 from my installation. I know the car can pull 48 amp with the right outlet but my home circuit breaker box can only support 32 amps continuous. I took it to a third party shop to see if the issue was the common ruined on-board charger or ruined fuses found in this thread:
Replacing Onboard Charger Gen3 2017 MS75D...My Experience (With Photos). You can better see the internals of the EU version in this video :
Found out there was a portion of the on-board charger that showed a circuit board burn. Third party tech (used to work at Tesla btw) and I thought it would be best to just close it up and let me continue charging along at 24 amps. I get the CHG_f018 Unable to charge error every time I charge since the past two years but it used to always reach 24 amps.
The issues appeared after I had my front central intake duct assembly replaced (ASY FR END DUCTING WITH HORNS, MS2 1058073-00-B) recently by Tesla due to the loud fan issue talked about here:
Extremely loud noise when charging from the wall connector
Has anyone repaired cooling louvers?
Tesla also recommend that I change my charge port and on-board charger to address the CHG_f018 unable to charge error but I just told them to do the charge port only and leave the onboard charger. I didn’t want to pay $3000 CAD to go from 24 amps to 32 amps. I was expecting to receive my car back with it able to charge at 24 amps but was only limited to 6 amp after visiting them.
If my on-board charger is dead, how can I still charge at 6 amps? Why can I sometimes get 24 amps after leaving it idle? Thanks for listening!
TLDR: Half broken on-board charger was able to charge at 24 amps for 2 years and now can only do 6 amps. Strange workarounds can sometimes allow more amps.
I recently created an account here after not being able to figure out the cause of my charging issue. I have been lurking this forum for some time and it has been of great help fixing other issues in the past so I just want to say thanks before going any further. It’s a long read so I hope you can hang in there.
Problem:
When charging at home my Dec 2016 tesla model S using my gen 1 mobile connector on a NEMA 14-50 outlet, the amps try to ramp up to my set point of 24 amps and when it reaches 10 or so amps, it drops down to zero. The car tries to ramp up the amps again and it continually fails. I can hear the mobile connector making a clicking noise. After 3-4 tries the car shows a red light on the charge port and the following errors:
CHG_u014 Charging equipment reports error
CHG_u007 Charging equipment reports error
CHG_f083 Cannot charge-poor grid power possible
Here is the strange part. I get the same errors and red light when I tried two different tesla destination chargers, a third party level 2 charger and a friends gen 2 mobile charger at his home NEMA 14-50 outlet. For these reasons I do not think the issue is my mobile charger or outlet. Supercharging works fine so I suspect its my on-board charger.
Fix attempts:
- Two finger restart-no changes
- Car off from central touchscreen-no changes
- Wheel configuration restart-no changes
- Retightening of ground on NEMA 14-50 outlet-no changes
- Car off from central touchscreen+12V disconnect+HVIL disconnect + 5 minute wait-no changes
- I can charge the car at 6 amp at 240V (About 1.4 kW). Any more than 6 amps and it eventually goes to a red light around the charge port.
- I can charge the car at 6 amp at 240V (About 1.4 kW) and then increase to 15 amp after 3 hours. Any more than 15 amps and it eventually goes to a red light around the charge port. This works sparingly and less often after a few weeks with this issue. It also sometimes fails two or three hours after reaching 15 amps.
- I have been able to get the full 24 amps back by leaving the car unplugged and idle over two days. I realized this after leaving my car unplugged during two different camping trips. I am not sure what the 2 days of idle time do to make the 24 amp charging work.
I am the second owner and purchased the car in Nov. 2020. Soon after getting my NEMA outlet installed in Jan 2021 I was only getting 24 amps instead of the possible 32 from my installation. I know the car can pull 48 amp with the right outlet but my home circuit breaker box can only support 32 amps continuous. I took it to a third party shop to see if the issue was the common ruined on-board charger or ruined fuses found in this thread:
Replacing Onboard Charger Gen3 2017 MS75D...My Experience (With Photos). You can better see the internals of the EU version in this video :
Found out there was a portion of the on-board charger that showed a circuit board burn. Third party tech (used to work at Tesla btw) and I thought it would be best to just close it up and let me continue charging along at 24 amps. I get the CHG_f018 Unable to charge error every time I charge since the past two years but it used to always reach 24 amps.
The issues appeared after I had my front central intake duct assembly replaced (ASY FR END DUCTING WITH HORNS, MS2 1058073-00-B) recently by Tesla due to the loud fan issue talked about here:
Extremely loud noise when charging from the wall connector
Has anyone repaired cooling louvers?
Tesla also recommend that I change my charge port and on-board charger to address the CHG_f018 unable to charge error but I just told them to do the charge port only and leave the onboard charger. I didn’t want to pay $3000 CAD to go from 24 amps to 32 amps. I was expecting to receive my car back with it able to charge at 24 amps but was only limited to 6 amp after visiting them.
If my on-board charger is dead, how can I still charge at 6 amps? Why can I sometimes get 24 amps after leaving it idle? Thanks for listening!
TLDR: Half broken on-board charger was able to charge at 24 amps for 2 years and now can only do 6 amps. Strange workarounds can sometimes allow more amps.