P078A Mercedes B 160 OBD Code

OBD/2 P078A 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) P078A DTC is a check of the VCT unit.

As the engine heats up and combustion becomes easier and more complete, the PCM will command the idling control valve to increase the amount of air entering the engine to suit the changing conditions. However, when the load on the engine changes, say, when some electrical consumers or other systems are either turned on or off, the PCM adapts the signal voltage to the idle control valve to ensure that the idling speed remains stable, and at the RPM specified by the manufacturer.

P078A Mercedes B 160 Error Code Repair Process :

The rule of P078A 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 oil change reset button circuit short to ground. Likewise, overriding the OBD P078A 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 B 160 P078A OBD2 Code

A common cause of code P078A is the failure of Oil Change Reset Button Circuit Short To Ground, but there are several other possible causes as well, such as ;

Camshaft advance mechanism binding (VCT unit)
Faulty Air fuel ratio (A/F) Sensor 1 Bank 1
Faulty Intake Valve Timing Control Solenoid Valve
Damaged VCT phaser

P078A is a kind of Powertrain Trouble Code

Powertrain of a modern automobile, comprising engine (with exhaust system), transmission, drive shaft, suspension and the wheels. In a motor vehicle, the term powertrain or powerplant describes the main components that generate power and deliver it to the road surface, water, or air.

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

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P078A Mercedes B 160 OBD Code

P078A Mercedes B 160 Error Code Repair Process :

Common Causes of Mercedes B 160 P078A OBD2 Code

P078A code for other Mercedes cars