U0663 Jeep Cj2 OBD Code

OBD/2 U0663 error code description and symptoms.

Catalytic converters must be warm before they can work properly. On a cold start the PCM provides a rich mixture to keep the cold engine running.
All that extra fuel goes into the catalytic converter. But the exhaust isn't very hot, because, ah, the engine is pretty cold. GM has employed several strategies to fire up the catalytic converter quicker and reduce cold start emissions. One way is to use a secondary air pump that pumps outside air directly into the catalytic converter.

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.

U0663 Jeep Cj2 Error Code Repair Process :

When you turn on the ignition, the Service Engine Soon or Check Engine U0663 light should flash briefly, indicating that the OBD system is ready to scan your vehicle for any malfunctions. After this brief flash, the light should stay off while you drive as long as no problems are detected. If lack of ho2s21 switch - sensor indicates rich so, you'll be glad to know that your vehicle is equipped with an early warning system that could save you time, money, and fuel in addition to helping protect the lack of ho2s21 switch - sensor indicates rich.

Common Causes of Jeep Cj2 U0663 OBD2 Code

A common cause of code U0663 is the failure of Lack Of HO2S21 Switch - Sensor Indicates Rich, but there are several other possible causes as well, such as ;

Dirty Oil
EVAP canister or fuel tank leaks
Incorrect fuel pressure
Oil flow restriction in the oil passages or the VCT valve body

U0663 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.

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

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U0663 Jeep Cj2 OBD Code

U0663 Jeep Cj2 Error Code Repair Process :

Common Causes of Jeep Cj2 U0663 OBD2 Code

U0663 code for other Jeep cars