P0868 is a generic DTC code, which means it has the same definition for the Mercury Grand Marquis as it would any other vehicle. This particular code indicates that the transmission fluid pressure is below the minimum operating specs. If your Grand Marquis has P0868 the first thing you should do is check the transmission … Read more
P0715 is a generic, and somewhat rare OBDII trouble code. If your Mercury Grand Marquis has P0715, it indicates there is a communication error with the sensor that measures transmission input speed. Common Causes: A bad transmission speed sensor, shift solenoid, wiring issues, and even low/no transmission fluid can all cause P0715. P0715 Definition: Input/Turbine … Read more
P0688 is a relatively rare OBD2 trouble code. It’s a generic code, meaning that it has the same definition for any vehicle made for the 1996 model year and up. This includes the Mercury Grand Marquis. The most common causes of P0688 are a bad PCM power relay or a wiring issue between the PCM … Read more
P0685 is a somewhat rare OBDII trouble code. It’s a general code, so it has the same meaning for the Mercury Grand Marquis as any other vehicle. It indicates that the circuit that provides power to the PCM is not functioning properly. Most of the time, P0685 will cause your Grand Marquis not to start, … Read more
P0661 is a relatively rare OBD2 trouble code. It indicates that the electrical reading coming from your Mercury Grand Marquis’s intake manifold tuning valve control circuit (on the bank 1 side) is below its specified operating range. While P0661 is a generic code, so it has the same definition for all vehicles. P0661 Definition: Intake … Read more
P0660 is a somewhat common OBDII code. It’s generic, so it has the same meaning for the Mercury Grand Marquis as it would any other vehicle made for the 1996 model year and up. This code indicates that there is an issue with the bank 1 side of the intake manifold valve tuning control circuit. … Read more
P0627 is a somewhat rare and generic OBD2 trouble code, which means that it has the same meaning for the Mercury Grand Marquis as it would any vehicle made for the 1996 model year and up. In the Grand Marquis, P0627 is most commonly caused by a wiring issue, bad fuel pump, or defective CAN … Read more
P0621 is a generic OBD2 code, which means that it has the same meaning for the Mercury Grand Marquis as it would any other vehicle. However, it can be challenging to diagnose due to the necessity of removing the instrument cluster. OBD2 P0621 indicates an issue with the circuit that controls the generator lamp, which … Read more
P0622 is a somewhat rare OBD2 trouble code. It’s a general code, meaning it has the same definition for the Mercury Grand Marquis as it would any other vehicle. This code indicates the generator field coil control circuit is malfunctioning. It can be a challenge to diagnose. P0622 Meaning: Generator Field F Control Circuit Malfunction … Read more
P0650 is a somewhat rare OBD2 trouble code. It is generic, meaning that it has the same definition for any vehicle, including the Toytoa Grand Marquis Your Grand Marquis’s PCM will set P0650 when it detects an issue with the malfunction indicator lamp (MIL), also commonly referred to as the check engine light. The … Read more