U0666 Mercedes Slk 300 OBD Code

OBD/2 U0666 error code description and symptoms.

Variable Cam Timing Over-advanced (Bank 1) The comprehensive component monitor (CCM) monitors the VCT position for an over-advanced camshaft timing.
The test fails when the camshaft timing exceeds a maximum calibrated value or remains in an advanced position. Cam timing improperly set No oil flow to the VCT piston chamber Low oil pressure VCT solenoid valve stuck closed Camshaft advance mechanism binding (VCT unit) U0666 DTC is a check of the VCT unit.

Gear changes are accomplished by a command from the TCM to energize the clutch actuator to release the clutch; after which various actuators inside the transmission disengage the current gear, and depending on current operating conditions, engage the next higher or lower gear ratio. All of this happens much faster than a human driver could change gears, and in most applications, gear changes are as smooth and seamless as on any fully automatic transmission.

U0666 Mercedes Slk 300 Error Code Repair Process :

The rule of U0666 code when it comes to emissions-related vehicle repair is that any modification that changes the vehicle from a certified configuration to a non-certified configuration is considered tampering: this applies to both vehicle owners and repair facilities and is, therefore, a Federal offense. Replacing a catalyst with a straight pipe is one traditional example of alternative fuel controller. Likewise, overriding the OBD U0666 error in system through the use of high-tech defeat devices or non-certified computer chips, for example, would also be considered tampering. The OBD system may, however, be repaired back to its original certified configuration with certified performance chips or appropriate aftermarket parts.

Common Causes of Mercedes Slk 300 U0666 OBD2 Code

A common cause of code U0666 is the failure of Alternative Fuel Controller, but there are several other possible causes as well, such as ;

Camshaft advance mechanism binding (VCT unit)
Faulty Camshaft Position Sensor
Faulty TCM or TCM programming
Three way catalyst converter Bank 1

U0666 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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U0666 Mercedes Slk 300 OBD Code

U0666 Mercedes Slk 300 Error Code Repair Process :

Common Causes of Mercedes Slk 300 U0666 OBD2 Code

U0666 code for other Mercedes cars