Cadillac STS Fault Codes
You can find common Cadillac STS fault codes on this page that when clicked take you to a detailed description.
You can also type in the fault code you are getting below to find a more detailed description.
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Cadillac STS Recalls
When a car manufacturer detects a problem with a model they put out a recall notice and more often than not offer to fix the problem free of charge.
You can check to see if your Cadillac STS has any recall notices on our sister site AutoRecalls.co, sorted by model year.View Cadillac STS Recalls »
Common STS Fault Codes
These are the most common STS fault codes that people are searching for.
System Too Lean (Bank 1)Learn More Fixes
System Too Lean (Bank 2)Learn More Fixes
Cylinder 2 Misfire DetectedLearn More Fixes
Heated Oxygen Sensor (HO2S) Heater Control Circuit Bank 1 Sensor 2Learn More Fixes
Catalyst System Efficiency Below Threshold (Bank 1)Learn More Fixes
Transmission Control System MalfunctionLearn More Fixes
Camshaft Position B - Timing Over-Advanced or System Performance (Bank 2)Learn More
System Gross Leak Evaporative EmissionLearn More Fixes
Fuel Pressure Regulator PerformanceLearn More Fixes
Mass or Volume Air Flow Circuit Low Voltage InputLearn More Fixes
Intake Camshaft Position Actuator Circuit / Open (Bank 1)Learn More Fixes
Random/Multiple Cylinder Misfire DetectedLearn More Fixes
Intake Camshaft Position Timing - Over-Advanced (Bank 1)Learn More Fixes
Catalyst System Efficiency Below Threshold (Bank 2)Learn More Fixes
Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance ProblemLearn More
Cooling Fan 1 Control Circuit MalfunctionLearn More
Crankshaft Position Camshaft Position Correlation Bank 1 Sensor BLearn More Fixes
Engine Position System Performance - Bank 1Learn More
Engine Coolant Flow Low/PerformanceLearn More
Lost Communication With ECM/PCM "A"Learn More Fixes
Lost Communication with TCMLearn More
Evaporative Emission System High Purge FlowLearn More Fixes
Exhaust Camshaft Position Timing - Over-Advanced (Bank 1)Learn More Fixes
System Too Rich (Bank 1)Learn More Fixes
System Too Rich (Bank 2)Learn More Fixes
Cylinder 1 Misfire DetectedLearn More Fixes
MAF Sensor Out Of Self Test Range./KOER Not Able To Complete KOER AbortedLearn More
Intake Air Volume Circuit MalfunctionLearn More
Air Pump Circuit Malfunction/ (AIR) System Bank 1Learn More
Control Module Power Circuit Low/High VoltageLearn More
HO2S Insufficient Switching Sensor 1Learn More
SCP (J1850) Invalid or Missing Data for Network ControlLearn More
Cam Control FaultLearn More
Throttle/Pedal Position Sensor/Switch D/E Voltage CorrelationLearn More Fixes
Intake Camshaft Position Timing - Over-Advanced (Bank 2)Learn More Fixes
Cylinder 6 Misfire DetectedLearn More Fixes
Mass or Volume Air flow Circuit Range/Performance ProblemLearn More Fixes
Passenger Door Ajar Circuit FailureLearn More
Evaporative Emission Control System MalfunctionLearn More Fixes
Input/Turbine Speed Sensor Circuit No SignalLearn More
SCP (J1850) Invalid or Missing Data for Primary IdLearn More
Lost Communication With Anti-Lock Brake System (ABS) Control ModuleLearn More
SCP (J1850) Invalid or Missing Data for Vehicle ConfigurationLearn More
Control Module Communication Bus "A" OffLearn More Fixes
SCP (J1850) Invalid or Missing Data for Primary IdLearn More
Lost Communication With Body Control ModuleLearn More
Pedal Correlation PDS1 and PDS2Learn More
A/C Compressor Temperature Sensor MalfunctionLearn More
Ignition 1 Switch Circuit 2Learn More
Internal Voltage Regulator MalfunctionLearn More
Data Output Link Circuit FailureLearn More
Theft Deterrent Fuel Enable Signal Not Received/ B+ Supply To VCRM A/C Circuit MalfunctionLearn More
HO2S Insufficient Switching Bank 2 Sensor 1Learn More
Intake Camshaft Position Timing - Over-Retarded (Bank 1)Learn More Fixes
Exhaust Camshaft Position Actuator Circuit / Open (Bank 1)Learn More Fixes
Crankshaft Position Camshaft Position Correlation Bank 1 Sensor ALearn More Fixes
Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance ProblemLearn More Fixes
Intake Air Temperature Circuit High InputLearn More Fixes
Coolant Thermostat (Coolant Temp Below Thermostat Regulating Temperature)Learn More Fixes
O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)Learn More Fixes
O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)Learn More Fixes
O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)Learn More Fixes
O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)Learn More Fixes
O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)Learn More Fixes
O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)Learn More Fixes
Cylinder 3 Misfire DetectedLearn More Fixes
Cylinder 4 Misfire DetectedLearn More Fixes
Cylinder 5 Misfire DetectedLearn More Fixes
Knock Sensor 1 Circuit (Bank 2 or Single Sensor)Learn More Fixes
Knock Sensor 2 Circuit Low Input (Bank 2)Learn More Fixes
Crankshaft Position Sensor A Circuit MalfunctionLearn More Fixes
Camshaft Position Sensor Circuit Range/PerformanceLearn More Fixes
Exhaust Gas Recirculation Flow Insufficient DetectedLearn More Fixes
Evaporative Emission Control System Incorrect Purge flowLearn More Fixes
Evaporative Emission Control System Leak DetectedLearn More Fixes
- Manufacturer: Cadillac
About the STS
The STS first made its debut as the successor to the Cadillac Seville in 2004. The midsize luxury sedan remained on the market until it was succeeded by the XTS in 2011.
During this time, General Motors released only a single generation of the model. However, like many other Cadillac offerings, there was a high-performance version released called the STS-V. This variant was unveiled a year after the model’s initial release.
Competition for the STS typically came from the likes of the Audi A6, BMW 5 Series, and Mercedes-Benz E-Class.
Like some other Cadillac offerings, the STS was prone to run lean. This was shown by fault codes P0171 and P0174 being the two most commonly reported issues.
These codes indicate that the first and second bank of the engines are running too lean respectively. Typically the second code would only apply to a limited number of engine configurations, but most of the STS models were fitted with either a V6 or a V8.
It is important to look for additional fault codes that can help pinpoint the cause of this issue. However, being logged together can also be helpful in finding the source.
Owners have reported that a faulty intake manifold gasket is by far one of the most common causes of both codes being logged together. It is also possible that the MAF sensor is failing.
Adding to this issue, fault code P0302 is another common code. This code is logged when a misfire has been detected from cylinder 2.
This can be a direct result of the engine running too lean, so other fault codes can help find the solution again. In addition to this, owners have commonly reported faulty ignition coils.