What does "power is too low" mean? - Garmin Astro 220 GPS

Error code 122 means " Low voltage FAN error ".

Is the FAN (bottom right of the front) of the low voltage power supply block working? Is the FAN connector connected correctly?

Check to make sure connection of the FAN connector. Replace the low voltage power supply unit. Replace the FAN motor. Replace the low voltage power supply unit.

Source: https://www.okoki.co.uk/how-to-fix-oki-printer-error-codes

Actually the message is Bat Low meaning the internal batteries need to be replaced.

White smoke mean burning coolant you most likely have oil in radiator. With the low power the engine is low on compression. I would say vehicle is going to need a new engine or a engine rebuild

High on mileage means that the engine has done a lot of work, possible that the compression is down, need to check if this is below level, if there is oil used in excess then the engine needs an overhauling subject to the cost estimated.

Cant compromise on bad fuel as this will bring down the power of the engine.
High fule consumption means poor setting so fuel and ignition , check fuel settings- pump calibration and timing.

Check the power steering fluid and make sure it isnt low. P/S means power steering.. meaning the you need to check the system. Usually this light come on when your low on power steering fluid.

Low engine capacity does not mean that the car is not fit for daily computing. It is the space and comfort that comes along with a high capacity engine or car. With the 1000 cc engine you get an optimum fuel consumption especially in these times and is acceptable.
Low engine capacity does not mean there is no power as these engine are good for easy maneuver with good power to weight ratio.
If you are happy with the comfort then safety is the other factor on small cars.

well if u mean its hard to turn then i would suspect its the power steering pump is bad just because its not low on fluid doesnt mean its not bad

No it does not, it means there is an issue with one of the speedometer inputs, see the chart I attached to help you understand.
SPEEDOMETER TROUBLE CODES

CODE - TROUBLE - WIRE COLOR
d01 - speed sensor power output shorted low - red
d02 - speed sensor power output shorted high - red
d03 - not used
d04 - not used
d05 - speed sensor return shorted high - white
d06 - speed sensor return shorted low - white
d07 - not used
d08 - peedometer power overvoltage - orange/white
d09 - speed output shorted high - white/green
d10 - speed output shorted low or open - white/green
5 digit number - speedometer pulses per unit

The first letter: A = Ge material semiconductors, B = Si material semiconductors, C = GaAs material semiconductors, R = Compound material. The second letter: A = Diode (low power, signal); B = Diode (variable capacitance)); C = Transistor (low power, audio frequency); D = Transistor (power, audio frequency); F = Transistor (low power, high frequency); L = Transistor (power, high frequency); R= control and swithching device); S = Transistor (low power, swithching); T = thyristors; U = Transistor (power, switching); X = Diode (varactor, multiplier); Y = Diode (rectifier); Z = Diode (zener). So the BC547 is a Silicon low power, audio frequency transistor. Hope that helps!

is it working? some amps says low v but is only a feature.lower voltage means lower impedience higher voltage means high output but high imp needed.the indication could mean +-24v not 12.