Question about 2008 Chevrolet Impala
I have been reading online about this problem but nobody has had a resolution to this problem. I've read for other people the car slows down and will not go over 20mph. The car doesn't do this for me. It still continues to go the speed I need it to though I don't go over 45mph and turn off the radio, heat, and dim the lights to conserve power. It does hard shift around 2nd gear though. Not every time but often enough to where it's noticeable. I just got it taken in and 'fixed' yesterday. (They replaced the throttle. As well as purge valve and vent valve but that was part of a different problem.) Didn't notice a change in drive but the car shifted hard after driving for 10 min and engine power reduced came on and check engine light is back on. I pulled over and turned off the car. After turning it back on engine power reduced was off but check engine is on yet again. Throws code p1238. I don't want to spend more money blind guessing what it could be as this has already cost 750 bucks! Answers would be VERY greatly appreciated!
Check engine lights notify problems in 2 areas . firstly the engine and also the transmission.As you state a problem in the transmission it is possible that is the area of concern. A service dealer will be able to tell you exactly what the sensor fault is for that code.
Posted on Nov 07, 2014
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Posted on Jan 02, 2017
These trucks have a drive by wire system,we seen a` lot with a broken ground wire on the rear of the drverside cyl head,this is hard to see just feel and give the wire a tug .If the wire is loose or broken the reduced engine power light will come on.
Posted on Feb 15, 2009
First, check the passageway to the egr valve to make sure it is clear (often plugs up with carbon) second, make sure that the egr control is working. Also a good idea to have any codes checked and old ones cleared.Computer may need to cycle a few times to "learn"new parameters.
In general, it is good to shut down your engine when check engine light comes on...The next step after that is to determine why the light came on.
If the cause is an oil related or coolant related item, you should drive no further 'till it's corrected...However, there are numerous sensors that can turn it on with no disasterous results if you continue to drive One example is the light coming on because a gas cap has not been put on correctly...On many vehicles this will turn on the light and set a code, but the car will suffer no damage if you drove to your destination before correcting it.So, if the light comes on and it is not overheating and you have good oil pressure, and you hear no noises from engine, have it looked at but don't put yourself in danger on the side of a major highway for a nonsense code.
Most major parts houses will read codes free...take advantage of that service and get yourself a basic repair manual, so you have an idea what all the stuff under your hood is and does.
Good luck with your car!!
Posted on Apr 26, 2009
SOURCE: engine power reduced
Locate the IP to body harness connector, which may be located in and around the left hand kick panel area or inside the IP. Check to see if there is a water leak into the area and repair as necessary.
Posted on May 24, 2009
2 simple causes for your symptoms would be water in the fuel tank (pour drygas into the tank to alleviate this problem) or a leak in the exhaust system. If both items don't apply, check for any vacuum leaks under the hood. You've isolated the problem to either vacuum leaks or a fuel problem. Hopefully, this will give you a general area to look and solve your problem. Best of luck.
Posted on Jun 22, 2009
If you are really really lucky, it is the harness on the side of the transmission. Unplug the harness looking for corrosion. Clean and reassemble.
It could be the TFP Switch, wires connecting TFP to PCM or the PCM is bad
Posted on Sep 14, 2009
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