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Check U1109 Fault Code

When you check engine light came on code U1109 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 U1109 OBD-II Diagnostic Network (U) Trouble Code. So you should chech it on our car models.

U1109 Code Reason

U1109 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.

U1109 Possible Fix :

If the culprit is a poor fuel pressure regulator, then I suggest looking around for a replacement part and taking your car to your local mechanic for installation. If you're a skilled mechanic, then you should be able to install a new fuel pressure regulator easily. But if you're just starting out, it's always best to have the professionals take care of this job. Believe me, the fuel pressure regulator is not an easy part to install.

U1109 OBD-II Diagnostic Network (U) Trouble Code Description

U1109 SCP (J1850) Invalid or Missing Data for Electric Traction Drive (Inverter) so you have to check ODB-II Fault Code Check list.

Reason For U1109 Code

The reason of U1109 OBD-II Fault Code Check is U1109 SCP (J1850) Invalid or Missing Data for Electric Traction Drive (Inverter).

U1109 Solution:

Excessive air inflow can be caused by a vacuum leak, a dirty sensor or, an exhaust gas recirculation valve not closing properly. If the problem is not enough fuel, the culprit may be dirty injectors or fuel filters, a weak fuel pump or a leaky fuel pressure regulator. The lean fuel mix error may be accompanied by rough idling, engine misfires, hesitation during acceleration and overall poor engine performance.

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