C1257 Trouble Code

View C1257 obd/2 error code description and symptoms. C1257 engine photo

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) C1257 DTC is a check of the VCT unit.

To check for an open circuit, trace along the length of the transmission control circuit, checking for breaks in the wiring. Repair any broken wiring and make sure all connectors are fully seated and locked.Pay close attention to connectors, looking for corrosion, bent or broken pins, or moisture in the connector. Repair any connector issues even if they are not specifically part of the transmission control circuit as they may serve a function in providing power to the transmission control circuit.

C1257 Error Code Repair Process :

If your vehicle failed a C1257 test and the C1257 Check Engine Light is NOT on, chances are you have a problem with the OBDII system, a burned out MIL lamp, or a faulty catalytic converter. The converter is essentially an afterburner that cleans up the exhaust after it exits the engine. The OBDII system uses c1257 abs inlet valve coil rr circuit short to ground a ownstream oxygen sensor to monitor the efficiency of the converter, and it should detect a drop in converter efficiency if the converter has been contaminated or is failing (ignition misfiring, leaky exhaust valves, and oil burning can all damage the converter). What you want to look c1257 abs inlet valve coil rr circuit short to ground: Any conditions that might cause ignition misfire, an overly rich or lean fuel condition, or loss of compression. Use your OBD Express DIY to look at the oxygen sensor outputs, coolant temperature, airflow, calculated engine load, and inlet air temperature.

C1257 is a kind of Chassis Trouble Code

Diagnosing chassis noises can be one of the most frustrating problems technicians face. Fortunately, manufacturers have engineered noise, vibration and harshness (NVH) diagnostic techniques and equipment to find the source of the noise.

Common Causes of C1257

A common cause of code C1257 is the failure of C1257 ABS Inlet Valve Coil RR Circuit Short To Ground, but there are several other possible causes as well, such as ;

Camshaft advance mechanism binding (VCT unit)
Damaged camshaft position (CMP) sensor
EVAP system hose leaking
Faulty Variable Camshaft Timing (VCT) position solenoid

C1257 code for all cars

You can view according C1257 DTC for your car model. We selected several models to see obd2 solutions click and view it.

+C1257 Porsche 3400

+C1257 Chevrolet Intimidator

+C1257 Mercedes Cla

+C1257 Honda Hr-v

+C1257 Chrysler Atlantic

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