2005 chevy aveo dtc P0300 and Hold light flash only after 30 mph will not come on if the speed is kept under that and tried raising car off ground and drove to 80 mph no lights and tried pressing brakes to simulate load no problem only actually driving??changed crack sensor no difference??

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

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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.

Stop using the vehicle

You have converter ruining cylinder misfires,
when you have a check light that flashes

Has to be checked for codes & problems diagnosed

Engine light lit ? Have it checked for DTC'S - diagnostic trouble code's ! Do you know what DTC'S are for ?

Once the tires are correctly inflated as per the required PSI, the light should go away, if not, follow these possible solutions. We are sure one of thse will work for you:
1. Drive at a steady speed of 50 mph for 10 minutes or higher, then switch off the engine, this may get the light to stop
2. Turn the key to the ON position and then press and hold the TPMS reset button located under the steering wheel. Check the car's manual to see where it's located. Hold the button until the TPMS light blinks thrice. Crank up the engine, and the sensor shall refresh within 20 minutes
3. Inflate all four tires to their recommended pressure plus three PSI more. Then deflate them entirely and then reinflate them to the recommended PSI
4. Remove the positive wire of the battery, switch on the car, and then press and hold the horn for three seconds to discharge any power left in the vehicle. Then reconnect the battery, and the problem should be solved.

their two wires two the light please test them with a test light the black one should be the ground .remove the bulb test the power side to the negative battery post . then test the ground side to the positive of the battery. you should get a good test light on both . then plug the bulb back in put tester on the ground side of the bulb receptacle and clamp the tester to the negative post of the battery if you get the tester flashing the ground is poor and will need to be cleaned you can trace the wire to its ground point take off the bolt and sand it with sand paper.

your brake fluid is low. I have a 2005 aveo that i took to dealer under warranty and told them the clutch didn't feel right and the brake light kept coming on. they told me they have not seen either issue i complained about charged me 700 dollars in labor and rental fees and sent me on my way. I then proceeded to take it to the used car dealership i bought it from and they bled the clutch and said they got alot of air out when chevy told me they didnt get any. Anyway about 3 weeks later the light was on steady and the clutch began acting funny again. I bled the clutch myself this time and didnt check the fluid level or i would have caught the next dangerous part. On the 2005 chevy aveo hatch back i have with a 1.6 5 speed shares one reservoir for brake and clutch fluid. I was driving along one day down a 12% grade about 2 mile long stretch and my brakes failed. I filled the brake fluid reservoir at first chance i got considering my arm was sore from operating the hand brake for 6 miles or so. the light went out. It will probably come back on as did mine. the leak in my system was a check valve under the brake master cylinder. be careful until you get to fixing it.

Please don't forget to rate....thank you:

1. Disconnect the negative battery cable.
   
2. Raise and support the vehicle safely.
   
3. Disconnect the starter electrical harness.
   
4. Remove the starter ground bolt.
   
5. Support the starter and remove the bolts.
   
6. Remove the starter from the vehicle.
   

The location of the starter


To install:

1. Before servicing the vehicle, refer to the Precautions section.
   
2. Install the starter. Tighten the mounting bolts to 32 ft. lbs. (43 Nm) on 2005 models. Tighten the solenoid nut to 11 ft. lbs. (15 Nm).
   
3. Install the ground bolt and tighten to 30 ft. lbs. (41 Nm).
   
4. Connect the starter electrical harness.
   
5. Connect the negative battery cable.
   

gm has a problem with this from way back. double check your spark plugs and if they are not ac delcos, change them. ive seen this time and time again swearing, myself, that there is no way that the plugs would cause this issue. it always comes up with random misfire and usually another 1 or 2 codes misfire codes. put in ac delco, no more codes. let me know

I've become SO FAMILIAR with this problem on my own Chevy Optra. The first time it happened, I took it in to my dealer. It cost me over $100 and I SWORE it would never cost me that again. It really IS the fuel system. (Sticking with Shell's "detergent" gas doesn't help!) Simple solution is to add a bottle of fuel SYSTEM cleaner (not just the fuel injector) and the FIRST sign of trouble or with each oil change. No more problems !! "Live and learn and pass it on !"

Pull out your spark plugs. Change them if dirty. There might be a problem with the fuel trim, thats causing spark plug to foul up prematurely. A stucked open EGR valve can also cause a multiple mispfire code(P0300) but then it would be accompanied by an EGR code(P402) which means excessive flow detected. Anyways if was indeed a fouled up spark plug change them as well as the air filter.