Engine and hold lights flashing

I purchase a used 2005 chevy aveo about 6 months ago. The engine was replaced with a used one due to timing belt failure (before i purchase it). Since then, after a five minute ride above 60km's, the engine and hold lights will start flashing. (engine light first). The transmission will also stay in 3rd gear, only after accelerating enough for the overdrive to kick in. Stop, shut the car off and restart, everything is fine, for about another five minutes. Code P0300, random missfire shows up on my OBD2. But the car works perfect, no miss and plenty of power even in 4th gear. Checked mostly all the things i have been reading about on this site. New plugs, checked for air leaks, visually inspected wires and coil, unplugged every sensor i could think off and replugged, Compression on all four cylinders are between 185 psi to 200 psi. Today i had the car into a mechanic's shop and it was hooked up to a Dianostic Machine. The was no problems to be found. He even misted the wires and coil with soapy water just to see if there was a problem there. Since buying the car my daughter has put about 3000 km's on it (to and from school) without any problems or high fuel consumption. If there was a problem, you'd think the cat and oxygen sensors would be destroyed by now. If there was a miss in the car i would do the elimation process and replacing each item until the lights were fixed but it works and drives as good as a new one. Any ideas or reccomendations with this issue are greatly appreciated. Also is there a way i can disconnect the Hold Mode all together, i hate to use it on the highway if it remains in 3rd gear.

I guess no one has any ideas or sugestions on this issue so i guess its time for me to look into similiar sites for help. Thanks anyways.

Sounds like you need to have a crankshaft relearn procedure done. When I swapped the 07 engine into my 05 I got the P0300 code as well and had to have this done to get rid of it.

Thanks Daox, Thats the only thing i can see that would be causing this or something else with the ECM. With your 07, did you notice any problems like misses or anything? Also did you still drive it until you had the relearn done? Again, thanks for the reply.

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Originally Posted by GPC

Thanks Daox, Thats the only thing i can see that would be causing this or something else with the ECM. With your 07, did you notice any problems like misses or anything? Also did you still drive it until you had the relearn done? Again, thanks for the reply.

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I was wondering if you got that problem taken care of, because I am experiencing the exact same issues with the exact same circumstances. Only I have already done the relearn procedure. Please advise, thank you.

I was wondering if you got that problem taken care of, because I am experiencing the exact same issues with the exact same circumstances. Only I have already done the relearn procedure. Please advise, thank you.

No such luck ak1you. Had it to the dealer, they tried a new ignition module and cleaned the valves. Still same problem. They couldn't find anything other then the P0300 code. I asked about the relearn and they said that it wasn't the issue. Sujested trying new wires, still the same. If i find out anything i will let you know, please do the same for me. Seems like the only way to a solution. Thanks

You got it. I've been thinking maybe the throttle body needs cleaning or replacing. Does it make any sense?

Anything at this point is worth trying. I will try the cleaning in the next couple of days, due to work requirements. Keep me posted on what you find out. Thanks

Here is something I really can't understand at all. Apparently modern cars are so tough that if a professional mechanic can't get a diagnostic handed to them from a machine, they just throw up their hands and say "duh, never seen that before" (which is same thing I would usually say). Ok, fine - it is what it is; but why can't they at least round up the usual suspects? Yes, we know that there are lots of possibilities for the P0300, but some of them are fairly well-known, and should be easy and simple for a Stealership to try (sorry about the profanity Vanessa). It's the same thing that we do, only they don't need to buy the parts. Why does an Aveo dealer not have one set of good plugs, wires, coil, cam sensor (and maybe some other easy ones I'm not thinking of) on hand, ready to try as temps. How long is it going to take a pro to swap those things out? First ask the customer if they want to pay for a part-sway try (labor only). Then, if something works, take out the temp and install a new one off the shelf - case solved. If nothing works, bill the customer for the time to install/remove the parts.
Ok, that's the end of my useless rant. Personally, I would first try a new set of OEM plugs (regardless of how new the existing ones are). Then, maybe go to a boneyard and pick up a basketfull of parts like the ones above. Might as well try hanging parts if the shop can't figure it out :confused2:

Well if someone at a dealership did as you suggested I would never take my car to them...ever. The reason you pay high labor charges at a dealership in part is for EXPERIANCE and also in part for EQUIPMENT to test. Any one can throw parts at a problem in hopes of fixing it....but I would not call them a mechanic LOL

The person you want to be working on your car mechanic or not dealership or not is the guy you call up and say hey every time I start my Aveo it sets a P300 and he say's oh that's the X and you take it there and he puts X in and away you go problem fixed. This only comes from experience and logic.

Every single part can be tested in the hands of someone a) with the knowledge and b) the tool to test it...and last but not least even with previous two they still need to have some LOGIC.

These days that's VERY hard to find I am afraid, rapid changes in technology and a number of other factors play into this as well.

You are having a P300 code set ?

In my 2009 Chev Aveo owners manual there is a paragraph about the transmission not shifting does the 2005 manual have the same blurp ? A random miss fire could be caused by the WRONG plugs......or even a fuel injector, the driver can narrow it right down, if he has some mechanical knowledge....the little test drive mechanics "USE' to do was for this reason.

It seems in at least one of these cases the car is running fine but setting a code, if it tells you it has a misfire and there's no misfire....then whatever detects misfires is the problem...if a misfire is present and setting a code, well that's another ball of wax.

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.

Does the throttlebody have anything to do with engine speed or possible engine speed fluctuations ? Indeed it does is that your problem, I can't say but am sure your TB could use cleaning anyways right (that's some logic).

If the mechanic told you the relearn wasn't the problem...take it somewhere else and have it done. Mechanics have this really bad habit of you can't possibly know anything....and may have dismissed it just because you suggested it and further they may not even know how to do it so of course THAT CANT BE THE PROBLEM.

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Originally Posted by avguy

Here is something I really can't understand at all. Apparently modern cars are so tough that if a professional mechanic can't get a diagnostic handed to them from a machine, they just throw up their hands and say "duh, never seen that before" (which is same thing I would usually say). Ok, fine - it is what it is; but why can't they at least round up the usual suspects? Yes, we know that there are lots of possibilities for the P0300, but some of them are fairly well-known, and should be easy and simple for a Stealership to try (sorry about the profanity Vanessa). It's the same thing that we do, only they don't need to buy the parts. Why does an Aveo dealer not have one set of good plugs, wires, coil, cam sensor (and maybe some other easy ones I'm not thinking of) on hand, ready to try as temps. How long is it going to take a pro to swap those things out? First ask the customer if they want to pay for a part-sway try (labor only). Then, if something works, take out the temp and install a new one off the shelf - case solved. If nothing works, bill the customer for the time to install/remove the parts.
Ok, that's the end of my useless rant. Personally, I would first try a new set of OEM plugs (regardless of how new the existing ones are). Then, maybe go to a boneyard and pick up a basketfull of parts like the ones above. Might as well try hanging parts if the shop can't figure it out :confused2:

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GUESS WHAT...... I did it well you are going to need a Crankshaft relearn procedure. However I had better luck at a Goodyear/Conrad tire shop then at the dealer. They were able to do it rather quickly, But right before I went their I had the crankshaft sensor replaced so one of them worked or a combination. I am just happy I don't have to deal with my wife nagging about it.

GUESS WHAT...... I did it well you are going to need a Crankshaft relearn procedure. However I had better luck at a Goodyear/Conrad tire shop then at the dealer. They were able to do it rather quickly, But right before I went their I had the crankshaft sensor replaced so one of them worked or a combination. I am just happy I don't have to deal with my wife nagging about it.

Oh and the car is shifting perfectly now.

ak1you,
Thanks for posting the result. I think you're saying that Goodyear replaced the crank sensor, and a bunch of other things as well, and that the combination of parts fixed the problem. Is that correct? If so, did they put a parts list on your bill?

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Originally Posted by avguy

ak1you,
Thanks for posting the result. I think you're saying that Goodyear replaced the crank sensor, and a bunch of other things as well, and that the combination of parts fixed the problem. Is that correct? If so, did they put a parts list on your bill?

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first I took it to the dealer tried the procedure 3 times no luck. After that I changed the sensor and took to goodyear.Now it's all good.

first I took it to the dealer tried the procedure 3 times no luck. After that I changed the sensor and took to goodyear.They didn't change anythings. Now it's all good.

Hi all I have a similar problem, Aveo 2005 in limp mode with high gas mileage after engine replacement because of idler pulley failure.
When replacing the engine I noticed the transmission coolant line had failed in the rad, so i flushed the coolant out of the tranny and replaced the rad
Seems a huge coincidence the idler pulley and the rad went at the same time or would one cause the other to fail ?
The code is p0300 random multiple cylinder misfire.
I have been driving it in limp mode over a month and on two occasions it came out of limp mode but still had the cel on, once for over an hour (drove nice shifting properly) and the other time for arround 5 mins on both occasions i was checking wires under the hood just prior,but can not replicate.
I have checked the harness voltages and all correct, changed the cps map tps plugs and leads misted the coils looked OK.
I had no ideas left so i took it to the stealership for a cam position sensor relearn.
They said it was a slipped timing belt and the relearn would not take, so i checked the belt and it was correct.
I am now thinking it may need the ecm reflashing.
Any ideas or suggestions would be appreciated

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Originally Posted by xyz

... and on two occasions it came out of limp mode but still had the cel on, once for over an hour (drove nice shifting properly) and the other time for arround 5 mins on both occasions i was checking wires under the hood just prior,but can not replicate ....

.... I had no ideas left so i took it to the stealership for a cam position sensor relearn.
They said it was a slipped timing belt and the relearn would not take, so i checked the belt and it was correct ......

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Sounds like you fiddled with the wires first, and then it drove fine? If so, IMO that's a smoking gun pointing to some type of electrical issue, such as a cut/broken wire. Could of course also be a bad connector to some part such as the coils, or maybe even a part (coil, etc.) that "reconnects" internally for a short time after stuff was moved around. Maybe a multi-meter test on various points in the system might reveal the problem.

Did you suggest that the stealership "relearn" the tech who told you the timing belt had slipped? ;)

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Originally Posted by avguy;

"relearn" the tech who told you the timing belt had slipped? ;)

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Good one,:laughing3:

I went through every connector i could find, today (again), sprayed them all with contact cleaner, checked voltages and signal wires all are correct. I also did a dry compression test and all cylinders are within 10 psi (so not the valves or rings). I am thinking to try a different stealership (Courtesy Chevrolet in Toronto don't seem to know how to do a relearn) Hopefully the next one has techs that know how to do the relearn.
Anyone got a Toronto recommendation.

Problem Fixed.
Took the Aveo to a different dealer (Old Mill Chevrolet Toronto) they tried the relearn and it wouldn't take so they wiped the computer clean and reinstalled the software then the cam position sensor relearn worked. The car works like new now.

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Originally Posted by xyz

Hi all I have a similar problem, Aveo 2005 in limp mode with high gas mileage after engine replacement because of idler pulley failure.
When replacing the engine I noticed the transmission coolant line had failed in the rad, so i flushed the coolant out of the tranny and replaced the rad
Seems a huge coincidence the idler pulley and the rad went at the same time or would one cause the other to fail ?
The code is p0300 random multiple cylinder misfire.
I have been driving it in limp mode over a month and on two occasions it came out of limp mode but still had the cel on, once for over an hour (drove nice shifting properly) and the other time for arround 5 mins on both occasions i was checking wires under the hood just prior,but can not replicate.
I have checked the harness voltages and all correct, changed the cps map tps plugs and leads misted the coils looked OK.
I had no ideas left so i took it to the stealership for a cam position sensor relearn.
They said it was a slipped timing belt and the relearn would not take, so i checked the belt and it was correct.
I am now thinking it may need the ecm reflashing.
Any ideas or suggestions would be appreciated

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I would go elsewhere they probabelly didn't do it right, try goodyear.

We're glad to hear that Old Mill was able to work out a resolution for you, xyz! I noticed you're writing from Canada, and wanted to let you know that if you should ever want to speak with Customer Service for your region you can contact GM of Canada at 800-263-3777 (Hours: M-F 7:30am - 11:30pm, Sat 7:30am - 6:00 EST).

Sarah (Assisting Vanessa), Chevrolet Customer Service

OMG....I have a 2008 Aveo,auto.. My engine light has been on for 1 1/2 years... My dealership replaced the sensor about a year ago. I faithfully take my aveo in every three months for a oil change..After senor was replaced the light went out for about 2 months.. Then back on... Very fustrating. Then about 4 months ago, went in for a timing belt replacement(2nd one @ 112,000 miles) and oil change, and when I got into my car to drive away....WOW not only was my engine light on, but my hold light too...The only thing they changed differently was the interior air filter. I went over the edge.. They told me to drive it home and come back and leave the car the next day.. Which I did. I DID notice that my car had problems with sticky gears.. Well they changed my GAS petal...HUMMMM.. Both lights went off...Then a month ago, I am driving on highway, 83 miles to work.. My car lost excelleration.. Thank-goodnes, I drove it to a nearby dealership, barely limped into the garage.. Left car.. picked up after work, Needed new Throdal body ...Then car ran another month..Now engine light back on.. Noticed my GAS CAP is not closing tightly, and there is a sensor there tooo.. This is my next replacement. Last week, replaced all brake pads, back disc brakes (1st time in 119,000 miles.. Front pads..waranteed Midas.. struts too.. New tires...Cars are expensive, but just paid it off, and I need to drive it another 100,000 miles... use regular gas.. Drive highway miles to work.. Keep at 60 mph.. great mileage.. REALLY drops down if I lean on 70mph... Love my Aveo 5 door....

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Originally Posted by sammy2012

OMG....I have a 2008 Aveo,auto.. My engine light has been on for 1 1/2 years... My dealership replaced the sensor about a year ago. I faithfully take my aveo in every three months for a oil change..After senor was replaced the light went out for about 2 months.. Then back on... Very fustrating. Then about 4 months ago, went in for a timing belt replacement(2nd one @ 112,000 miles) and oil change, and when I got into my car to drive away....WOW not only was my engine light on, but my hold light too...The only thing they changed differently was the interior air filter. I went over the edge.. They told me to drive it home and come back and leave the car the next day.. Which I did. I DID notice that my car had problems with sticky gears.. Well they changed my GAS petal...HUMMMM.. Both lights went off...Then a month ago, I am driving on highway, 83 miles to work.. My car lost excelleration.. Thank-goodnes, I drove it to a nearby dealership, barely limped into the garage.. Left car.. picked up after work, Needed new Throdal body ...Then car ran another month..Now engine light back on.. Noticed my GAS CAP is not closing tightly, and there is a sensor there tooo.. This is my next replacement. Last week, replaced all brake pads, back disc brakes (1st time in 119,000 miles.. Front pads..waranteed Midas.. struts too.. New tires...Cars are expensive, but just paid it off, and I need to drive it another 100,000 miles... use regular gas.. Drive highway miles to work.. Keep at 60 mph.. great mileage.. REALLY drops down if I lean on 70mph... Love my Aveo 5 door....

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Hello Sammy2012,

Thank you for your post and being a Chevy Customer! I apologize for any frustrations that Aveo5 has caused since owning. Although you've had various issues with your Aveo5, it sounds like you've gotten those issues resolved. Congratulations on paying your Aveo off and hope you continue enjoying your Aveo5 especially not having a payment now.

If you have any questions or customer service concerns, please know that I am here to provide customer assistance if and when needed.

Vanessa
GM Customer Service