U3993 Trouble Code

View U3993 obd/2 error code description and symptoms. U3993 engine photo

HO2S Sensor Circuit Malfunction (HO2S-11) During testing the HO2S Heaters are checked for opens/shorts and excessive current draw.
The test fails when current draw exceeds a calibrated limit and/or an open or short is detected. Short to VPWR in harness or HO2S. Water in harness connector. Open VPWR circuit. Open GND circuit. Low battery voltage. Corrosion or poor mating terminals and wiring Damaged HO2S heater. Damaged PCM.

In most cases, the TCM is integrated into a single housing with the PCM. Nevertheless, the section of the module which controls (automatic) transmission function may be powered up separately. In any case, the TCM is typically powered using switched (only present with the ignition switch in the ON, start, or run position) voltage. This circuit is normally equipped with a fuse, fusible link, and/or a relay. Frequently, the PCM and TCM are powered using the same relay albeit by separate circuits. Access to a reliable vehicle information source will yield necessary details of the TCM power circuit for the specific vehicle in question.

U3993 Error Code Repair Process :

If your air temperature external sensor circuit short to ground check engine light is illuminated, it's best to take it in for diagnostic testing, which can feel like a hassle. Because while the lights vary in appearance from vehicle to vehicle, all have the same basic meaning: There's a problem with the car's emissions system. The on-board diagnostics system U3993 and engine control unit are in charge of monitoring a bunch of different air temperature external sensor circuit short to ground, and if they get a reading that's a little out of whack, up pops the check engine light.

U3993 is a kind of Network Trouble Code

U-code indicates that engine communication errors and shows lost communication with engine parts.U-Codes are fairly straight forward, given all of the articles and technical publications that have been written regarding these problematic codes. In most cases, it just comes down to identifying the module that isn't communicating with the other modules on the CAN bus line for whatever reason.

Common Causes of U3993

A common cause of code U3993 is the failure of Air Temperature External Sensor Circuit Short To Ground, but there are several other possible causes as well, such as ;

Exhaust tube
Faulty ignition coil (s)
Incorrect fuel pressure
Oil flow restriction in the oil passages or the VCT valve body

U3993 code for all cars

You can view according U3993 DTC for your car model. We selected several models to see obd2 solutions click and view it.

+U3993 Nissan 100

+U3993 Suzuki X-90

+U3993 Warwick Buick

+U3993 Lamborghini P140

+U3993 Lotus Elise S3

Engine OBD 2 Codes website is a freeware resource center for engine trouble codes.

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