P0421 is a relatively rare OBDII trouble code. It’s generic, which means it has the same definition for the Cadillac DeVille as it would any other vehicle. It is technically defined as “Warm Up Catalyst Efficiency → Below Threshold (Bank 1)”. In layman’s terms, it indicates that your Cadillac DeVille’s catalytic converter is not scrubbing pollutants efficiently … Read more
P0411 is a general OBDII trouble code, which means that it has the same meaning for the Cadillac DeVille as it would any other car or truck. By definition, the code is letting you know that the ECM has detected incorrect flow in the secondary air injection system. P0411: Secondary Air Injection System → Incorrect … Read more
A relatively common, yet difficult to diagnose OBD-II trouble code is P0316. It has the same meaning for the Cadillac DeVille as it would any other vehicle. It indicates that there is a misfire at the startup of the vehicle, and that it happens within the first 1000 revolutions of the engine. P0316: Engine Misfire … Read more
P0740 is one of the most common transmission trouble codes. It means that the DeVille‘s computer has detected that there is an issue with the torque converter clutch (TCC) solenoid circuit. P0740: Torque Converter Clutch Circuit Malfunction The TCC “locks” the drivetrain, which allows for a true mechanical connection between the transmission … Read more
P0160 is a standard OBDII trouble code. It has the same meaning for any vehicle with OBDII, including the Cadillac DeVille. When a vehicle has P0160, the PCM/ECM is not detecting any activity from the sensor. It doesn’t mean that the O2 sensor isn’t getting power, but that the voltage isn’t changing, which is … Read more
P0118 is a common OBDII trouble code. It is a general code, which means that it’s going to have the same meaning for the Cadillac DeVille as it would any other vehicle. P0118: Engine Coolant Temp Sensor Circuit → High Input This code is thrown when the resistance coming from the coolant temp sensor … Read more
P0410 is a generic OBDII trouble code. This means that it has the same meaning for the Cadillac DeVille as it would any other vehicle. It is letting you know that there is an issue with the secondary air injection system. P0410: Secondary Air Injection System → Malfunction The secondary air injection system injects air … Read more
P0506 is a common OBDII trouble code. It is typically triggered when the engine idle speed is lower than the predetermined limit set by the manufacturer. It is a generic code, which means that it has the same meaning for the Cadillac DeVille as it would any other vehicle. P0506 Symptoms: DeVille Most … Read more
P0156 is an OBDII trouble code that occurs in the Cadillac DeVille. It is typically caused when the O2 Sensor voltage is not within its specified operating range. Bank two will be the side of the engine with cylinder 2 in the firing order. Sensor 2 is aft of the catalytic converter. … Read more
P0505 is an OBDII code that deals with the idle air control system in the Cadillac DeVille. It’s a generic code, which means that it has the same meaning for the DeVille as it would any other vehicle (DeVille or not). P0505: Idle Air Control System: Malfunction When P0505 is triggered, it is typically caused … Read more