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U0621 engine code seems a kind of network problem, we try to show one by one the meaning and the solution.
Brief explanation of the U0621 code and definition of U0621 is the bottom side.
Problem is climate control system, lighting, airbags, etc.
|0||SAE - Generic|
|6||Vehicle Speed Control And Idle Control System|
|2||Air Conditioning (A/C) Clutch Feedback Circuit High Voltage|
|1||TFP Valve Position Switch-Drive Without Drive Ratio|
SAE - Generic codes, which have a '0' as their second digit to indicate they are common to all makes and models of vehicles. These are the codes that are required for basic emissions fault diagnosis.
How To Fix U0621 ?
The engine system, in conjuction with the engine control module (ECM)/powertrain control module (PCM), activates the U0621 code solenoid valve to control oil pressure to the engine mechanism that is installed in the valve system to switch valve timing between Low and High.If the engine solenoid valve has an open or short circuit, a DTC is stored.
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. When you see U0621 engine fault code on your engine code reader this description will help you.
|U Codes||List of all Network codes.|
Final Step: In the definitions listed below, there is a test drive recommended after you've completed any repairs to see if the condition is fixed. Before you take a test drive after a repair, always erase the U Code(s) first. This will turn the check engine light off and then you will know if the check engine light returns, you've got further diagnostics to complete.
BE CAREFUL !
This engine code information is presented for information purposes only. This is not intended as repair advice and we are not responsible for any actions you take on any vehicle.