Reduce engine power sensor scan code po641
Possible causes
- Faulty Engine Control Module (ECM)
- ECM harness is open or shorted
- ECM circuit poor electrical connection
- Shorted sensor on 5 volt circuit
What does this mean? When is the code detected?
The Engine Control Module (ECM) has detected the sensor 5 volt reference circuit voltage is higher or lower than expected
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P0641 Chevrolet Description
The control module has 2 internal 5-volt reference buses called "5-volt reference 1" and"5-volt reference 2". Each reference bus provided 5-volt reference circuit for more than one sensor. Therefore, a fault condition on one 5-volt reference circuit will affect the other 5-volt reference circuits connected to the reference bus. The control module monitors the voltage on the 5-volt reference buses.
Read more: http://engine-codes.com/p0641_chevrolet.html#ixzz31AP60YfR
P0641 Chevrolet 5 Volt Reference Voltage Incorrect
The control module has 2 internal 5...
SOURCE: cobalt
When you have the display panel say engine power reduced...and car stops. The item that needs checking and replacing is called a ECM- Electronic Control Module, it looks like a miniature sealed laptop that plugs in on the drivers side of the engine. We used to have the car do this all the time, until we replaced that module, I have since put 30 K on the car, and it now runs fine. It did cost a few bucks to fix for sure.
Brenda
SOURCE: why does reduce engine power light comes on chevy
That is a hard problem to pin point without knowing what codes the computer has stored. It can be any number or sensors or engine problems.
You can go to most auto parts stores and they will pull the codes for you for free.
SOURCE: tps sensor code, map code and engine power reduced
Cant be for sure by the vague description you wrote, but it looks to me it might be the catalytic converter.
SOURCE: 2005 chevy cobalt, car wont start ... check
disconecting the battery should reset the pcm. but you will need to find out what caused the problems.
SOURCE: engine won't start and shows trouble code P1516 and reduced engine power light is on
Here is the definition of the code.
Possible causes
- Faulty Throttle Actuator Control (TAC) module
- Throttle Actuator Control (TAC) module harness is open or shorted
- Throttle Actuator Control (TAC) module circuit poor electrical connection (loose or broken wires)
P1516 CHEVROLET Description
The Throttle Actuator Control (TAC) module contains data which is
essential for proper TAC operation. The TAC module continuously test the
integrity of this data. When the TAC module is unable to write or read
data to and from Random Access Memory (RAM), or the TAC module is unable
to correctly read data from the flash memory or and internal TAC module
processor fault is detected and the Detected Trouble Code (DTC) is set.
Read more: http://engine-codes.com/p1516_chevrolet.html#ixzz286Gl3cSo
Please see my tip at http://www.fixya.com/cars/r5932051-check_engine_light_check. These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.
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