U1126 Engine Error Code
When you check engine light came on code U1126 the reason should be Engine Light ON (or Service Engine Soon Warning Light). However your vehicle's manufacturer may have a different definition for the U1126 OBD-II Diagnostic Network (U) Trouble Code. So you should chech it on your car models.
Reason For U1126
Parts or components should not be replaced with reference to only a U1126 DTC. The vehicle service manual should be consulted for more information on possible causes of the fault, along with required testing.
U1126 OBD-II Diagnostic Network (U) Trouble Code DescriptionU1126 SCP (J1850) Invalid or Missing Data for Primary Id so you have to check ODB-II Engine Error Code list.
U1126 Code Review :The reason of U1126 OBD-II Engine Error Code is U1126 SCP (J1850) Invalid or Missing Data for Primary Id.
How To Recognise U1126
The most likely cause of this is that there is no refrigerant left in your system. This could be caused by a leak in your system somewhere, which will have to be fixed before refilling the refrigerant. If you're car-savy and you own a set of air conditioning gauges, refilling the refrigerant is usually easy to do yourself. However, if you're not so confident, enlist the help of a knowledgeable friend or take a quick trip to the mechanic.