Macbook Pro 2011 High Kernel Task CPU%

MacBook Pro (13”, late 2011); Memory 4GB; Processor 2,4Ghz Intel; Graphics Intel HD; Mac OS Sierra 10.12.6; Power adapter original 60W (got 2 of them); Battery new. This issue has been reported before (MacBook Pro 2011 slow) and appeared to be solved since the Mac was working fine for three days. Before the problem only occurred when the battery was nearly 100% charged with the power adapter connected. Here is what happened afterwards: - When the battery is charging while having the power adapter connected, the Mac always gets very slow. - The activity monitor is showing kernel CPU usage of up to 500%, the system is running at ~93%, user load is normal =/< 8%. All other processes are normal. - The activity monitor is not showing any processes with excessive energy consumption. Memory consumption is normal too. The CPU goes back to normal immediately when on Battery only, with the Power Adapter disconnected. Within a minute after connecting the power adapter the game starts all over again. - No difference with different power adapters. - Sometimes it takes a while before the green or orange LED from the Power Adapters connector is coming up. A couple of different tests have been performed, all done without third party hardware, nothing connected, not even LAN. Software which had kernel extensions in Library/LaunchDaemons before, was completely removed. Checking the System load while on Battery: ***pmset -g sysload*** - 2025-01-02 15:34:49 -0300 - combined level = OK - user level = OK - battery level = OK - thermal level = Great Checking again while on Power Adapter with the CPU throttling: ***pmset -g sysload*** - 2025-01-02 15:36:19 -0300 - combined level = Bad - user level = OK - battery level = Great - thermal level = Bad Checking the thermal log while on Battery, no problems: ***pmset -g thermlog*** - Note: No thermal warning level has been recorded - Note: No performance warning level has been recorded - 2025-01-02 15:56:26 -0300 CPU Power notify - CPU_Scheduler_Limit = 100 - CPU_Available_CPUs = 4 - CPU_Speed_Limit = 100 Checking again while on Power Adapter with the CPU throttling: ***pmset -g thermlog*** - Note: No thermal warning level has been recorded - Note: No performance warning level has been recorded - 2025-01-02 15:58:25 -0300 CPU Power notify - CPU_Scheduler_Limit = 40 - CPU_Available_CPUs = 4 - CPU_Speed_Limit = 29 Afterwards TG Pro was installed showing normal temperatures all the time. The fan speed was adjusting well to CPU loads. The fan and outlet are also clean. Adjusting the fan speed to max when the problem occurred made no difference. It is also not possible to sense any excessive heat when touching the Mac. The only way to get the CPU back to normal is disconnecting the Power Adapter and the system load drops immediately. A SMC reset is solving the problem for the moment until the battery is charging again while the Power Adapter is connected. The System Report is showing a negative mA reading while on battery power only which appears strange. In Safe Mode the Mac is still working fine under any power supply condition. Anyhow, after shutting down from Safe Mode and rebooting the problem comes back.