Engine light flashing...while accelerating...this started after I jumped someone off...car automatically shifts to 3 gear while im going 20 miles an hour...whats wrong...

Load test your battery first. If ok test if your alternator is actually charging battery

Sometimes you can only diagnose a faultwhen it is their / happening ....try earth straps around engine remove , clean and refit

It always starts out in first, it's a 3 speed automatic, that's what automatics do. they start out in first and at about 15-20 miles per hour , they shift to second gear, and when the speed is about 35-45 MPH, the transmission automatically shifts into third gear, or Drive.

Bigger automatics have 4 or more speeds. Till recently, 4 speeds were the norm, and fourth gear was often dubbed Overdrive, as it allowed the engine to run slower in 4th gear, than it had to maintain speed in 3rd gear, drive. It's good, it increases your mileage per gallon of gas, so you save that way, but like all things more complicated, they cost more to fix when something goes wrong.

2005 Chevy Aveo - engine light and hold lights flash - Fixya

www.fixya.com/.../t1361856-2005_chevy_aveo_engine_light_hold_ligh...

Dec 11, 2008 - 2005 Chevy Aveo - engine light and hold lights flash Yesterday I had my ... When I started the car to come home they started flashing again.

Chevrolet Aveo Transmission Problems - Car Forums at Edmunds.com

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Sep 23, 2010 - 30 posts - ‎19 authors
Next time it jumps out of gear to push the onstar button and have it towed to .... to either start in 3rd gear (absolutely no power from a cold start until .... The car has beenstuck in park in both situations, level ground and ... My automatic 2005 Chevy Aveo LS requires T-IV Automatic Transmission Fluid (GM pt.

Could be a transmission problem or something as simple as bad spark plugs.
The engine is under the most load when RPM is low and you are trying to accelerate, such as when it upshifts.
You should have the computer checked for trouble codes and hopefully that will point you in the right direction to test.
If the spark plugs have more than 50,000 miles of wear you might start with replacing them.

could be a shift solenoid or you need a new battery i had a similar problem with mine OD light would flash on and off and would not shift at all i could shut the car off turn it back on and wala it worked took it too AAMCO and the couldnt find anything wrong with it either and there the experts !! i did notice that the car would kinda turn over slow so i put a new battery in it and fixed the problem ! this worked for me maybe it will for you also

it req a new engine ecu.

This is a common problem of Volvo S40. You can try this trick to turn off the flashing arrow light.

1) Turn off Engine
2) Turn key to "On" position (Not start the engine), you will see the panel light will on
3) Step on the break paddle
4) Shift the gear from "P" to "L" 10 times
5) Turn key to " Off" position
6) Now you can start the engine.
7) If doesn't work, you can repeat the procedure.

Hope this tick help
Good luck

hello,have you a regular maintenance service to your car?better to check your fuel filter for contamination,transmission filter or your brake system maybe stuck-up piston caliper,ty

Check the idle speed.