U1138 Engine Trouble Code
When you check engine light came on code U1138 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 U1138 OBD-II Diagnostic Network (U) Trouble Code. So you should chech it on our car models.
When the check engine light comes U1138 code on the first you should check is the gas cap. Pull over, retighten it, and take a look at the cap to see if it has any cracks in it. Continue driving and see if the check engine light turns off. Alternately, you can purchase a gas cap for about $3 at an auto parts store. All you need to do is take the old one off and screw on the new one. If you've already made it to the store, you might as well just replace it. While not car-threatening, it's good to take care of this right away to improve gas mileage.
U1138 Code Meaning :
|OBD-II Diagnostic Network (U) Trouble Code For Engine||Fuel And Air Metering||Engine Oil Temperature Sensor Malfunction||Cold Start Injector 1 Malfunction||Timing Reference High Resolution Signal A Too Many Pulses|
The oxygen (02) sensors on your car measure the oxygen in the exhaust to determine how rich or lean the ratio of fuel and air are in the cylinders. Optimizing this mixture means better fuel economy and fewer exhaust emissions.
U1138 OBD-II Diagnostic Network (U) Trouble Code DescriptionU1138 engine trouble code is about Timing Reference High Resolution Signal A Too Many Pulses.
Reason For U1138 CodeThe reason of U1138 OBD-II Engine Trouble Code is Engine Oil Temperature Sensor Malfunction.
U1138 DTC specifically refers to the camshaft (cam) timing. In this case, if the cam timing is over-retarded, the engine light will be illluminated and the code will be set.