Cause engine power reduce car is in limp mode
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: 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: dtc code p0121 and p2135 2007 chevy malibu
both codes refer to the throttle position sensor, the sensor is at the throttle plate, on the side of the throttle body. to test remove the connector to sensor, use a ohms meter to test. put 1 lead to top connection and the other to the bottom one. move throttle and the needles on the ohms meter should move very even, move throttle slow to get a good reading, needle should move without no hesitation, if the test is bad replace tps sensor. if the sensor gets to bad, it can have an effect on transmission shifting. after fixing sensor have the light turned of with an obd2 scanner.
SOURCE: car is in
check and see if the traction control light, abs light are on the dash. those things can put your car in a reduction mode, because the computer thinks you are on a skid
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SOURCE: 2005 Chevrolet Cobalt in "limp home mode" code 606
P0606 indicates Control module internal performance. GM is indicating of the replacement ECM. Once replacement is completed reprogramming the ecm is necessary. Locally a few auot parts stores can reflash the ECM.May want to check with a NAPA or Carquest for this otherwise dealer is probably the only option.
Notice: Control module damage may result when the metal case contacts battery voltage. DO NOT contact the control module metal case with battery voltage when servicing a control module, using battery booster cables or when charging the vehicles battery.
Reverse process for installation
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