P0646 Engine Code Repair
Meaning of P0646 engine trouble code is a kind of powertrain trouble code and when the check engine light comes P0646 code on the first you should check is the gas cap. Pull over, retighten it, and take a look at the cap to see if it has any cracks in it. Continue driving and see if the check engine light turns off. Alternately, you can purchase a gas cap for about $3 at an auto parts store. All you need to do is take the old one off and screw on the new one. If you've already made it to the store, you might as well just replace it. While not car-threatening, it's good to take care of this right away to improve gas mileage.
P0646 Fault Symptoms :
- Check engine light comes on
- Engine stalling or misfiring
- Engine performance issues
- Car not starting
If one of these reasons for P0646 code is occuring now you should check P0646 repair processes.
Now don't ask yourself; What should you do with P0646 code ?
The solution is here :
P0646 Possible Solution:
Air Conditioning Pressure Sensor (ACP) Insufficient Pressure Change Each time the A/C clutch engages, the PCM is looking for a pressure change in the refrigerant. If the change in pressure is outside of the calibration the DTC will set. A/C system mechanical failure Open ACP or VREF circuit A/C sensor damaged A/C system electrical failure A/C clutch always engaged Verify A/C system function, including refrigerant charge.
P0646 Code Meaning :
P
OBD-II Diagnostic Powertrain (P) Trouble Code For Engine
0
Intake Valve Control Solenoid Circuit Low
6
Fuel Composition Sensor Circuit Malfunction
4
Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)
6
Crankshaft Position Sensor B Circuit Malfunction
The poor running symptoms are consistent with a MAP sensor malfunction. In addition, in some cases, a bad MAP sensor will not throw a code. Again, the ELD code likely represents a separate wiring issue.
P0646 OBD-II Diagnostic Powertrain (P) Trouble Code DescriptionP0646 OBD-II Trouble Code A/C clutch relay may also be referred to as A/C compressor clutch relay. A/C clutch relay circuit is monitored when ignition is on and battery voltage is greater than 10.4 volts. P0646 code.Main reason For P0646 CodeThe reason of P0646 OBD-II Engine Trouble Code is Fuel Composition Sensor Circuit Malfunction. |
P0646 DTC reports a sensor fault, replacement of the sensor is unlikely to resolve the underlying problem. The fault is most likely to be caused by the systems that the sensor is monitoring, but might even be caused by the wiring to the sensor itself.