Both are automatic transmissions, why do you wrote about LED? you can use the gear display, you don't need a separate LED...
So, your black car has a problem with power? there are many malfunction of parts they not will displayed at the faultcodes, heaven knows why...
you should search the faults without ECU/TCU-Diagnostics!
A noisy fuel pump can be damaged, but it's not a must, my fuelpump now and then is also noisy, but still works... if you find no other faults, you should replase it... so now we go on to search the faulty component...
Do you have parts to measure the fuel compression?
Something about black smoke?
Is the powerless at every time or like waves?
At low or high engine speed?
Whats about the consumption (oil and fuel)?
Startproblems at cold machine?
Or problems to start afters it's hot?
