First of all a scan tool is need for this not a code reader, you need to view scan data after you find what code is stored in the PCM. It could have a problem with the powertrain control module, wiring, or the
Accelerator Pedal Position (APP) Sensors. Here are a few codes that could set .
DTC P2120: Accelerator Pedal Position (APP) Sensor 1 Circuit
DTC P2122: Accelerator Pedal Position (APP) Sensor 1 Circuit Low Voltage
DTC P2123: Accelerator Pedal Position (APP) Sensor 1 Circuit High Voltage
DTC P2125: Accelerator Pedal Position (APP) Sensor 2 Circuit
DTC P2127: Accelerator Pedal Position (APP) Sensor 2 Circuit Low Voltage
DTC P2128: Accelerator Pedal Position (APP) Sensor 2 Circuit High Voltage
DTC P2138: Accelerator Pedal Position (APP) Sensor 1-2 Correlation
First use OBD reader to detect the exact trouble code.
Generally the reduced engine power is due to brake booster sensor just locate brake booster and you will find 2 cables connected to a small black box that goes inside the brake booster its inserted there with O ring you need to pull it out and clean the sensor with electronic cleaner and because this happens due to dirt in brake oil you must flush and change the brake oil.
Yes you need to have a scan tool to diagnois this problem, I'm a Chevy tech.this kind of problem is not for the diy'er. I found that most of the time it is the DTC P2138: Accelerator Pedal Position (APP) Sensor 1-2 Correlation
This guy with comment about rake booster does no have a clue.
Jeff I have Chevrolet Tahoe 2008 model which i bought brand new and I\'m still using it till date and I\'m getting all my service done from the dealer. when in my dashboard i was notified as engine power reduced about 1 year back then the dealer changed my vehicles brake booster for which i paid around USD 750 when I diagnosed the old part myself I found out that it was just dirty and sensor notifies that to vehicles ecu so based on the best of my understanding i commented above. And anyway I\'m not asking anyone to bomb their vehicle and it is easy and safe to clean it anyway! And if this is not the reason for this then its dealers are the one who don\'t have a clue which is pretty normal and this is how they earn thrice the price of a car. And yes if it is accelerator pedal position then the vehicle needs throttle cleaning. This is why I asked the person to diagnose by using OBD 2 reader first to understand the problem.
I'm a gm tech. there s several things that can cause power limited. most likely the throttle body or accelerator pedal. in rare cases you can have a wiring issue. to this day I have never seen a brake booster or the sensor cause power limited. cleaning your throttle body will only postpone replacement it does not fix the issue if this is what's causing it. I recommend scan the vehicle and find out what codes are there. if they are tps 1-2 correlation codes replace the throttle body. If its app 1-2 correlation codes replace the pedal. if there is any circuit high or low/open codes u may be looking at a wiring issue. I deal with these every day just my 2 cents.
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SOURCE: engine power is reduced keeps showing on the dash
how do you fix the "reduced engine power" light on the dash bard of a 07 Chevy Impala LTZ and "Service Traction Control"?
SOURCE: WHat does it mean when your traction control
Hello Jeremy.
When your traction light comes on it is indicating wheel spin on acceleration. To prevent wheel spin an onboard computer reduces engine power to limit the wheel spin. Some, if not most, cars equipped with this feature will also apply the brakes if wheel spin continues after reducing engine power.
Hope this answers your question.
Thank you for using Fixya!
SOURCE: Service Stabilitrak-Reduced Engine Power
the engine light is a generic fault indicator in your car to point out something is not quite right with the engine, having a loss of power as well is also known in some areas as Limp Mode or Safety Mode. it means the car is restricting the power it gives to ensure no damage it done to the engine.
the only certain way to find out what is wrong is to take it to a garage that has diagnostics equipment that can read the fault codes from the vechicles ECU (the fault codes will be the reason the light on the dash has come on as its reporting a fault somewhere)..
your mechanic should be able to tell you what is wrong with the engine from that and give you a more accurate cost at fixing it.
SOURCE: The "engine power is reduced" light comes on
po455 is Probable Cause[s]
1. Defective, loose or missing fuel cap
2. EVAP canister broke, hose cracked or not connected
3. Purge or vent solenoid defective
4 . Vacuum leak at engine po121 code po121 means Throttle Position Sensor/Switch A Circuit Range/Performance Problem . it is usually indicative of a faulty throttle position sensor or faulty wiring harness in the engine bay.
SOURCE: On my 2007 Chevy Equinox
i have chevy equinox 2007 LT with AWD system, my problem is that i have two messages appearing in the DIC : satbilitrack and service tracktion control. can u help me with this and tell me whats the problem and how should i fix it?
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