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Cadillac CT6 Fault Codes


You can find common Cadillac CT6 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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Do you know the fault code already? Enter it in the box below and hit "Search Codes".

Cadillac CT6 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 CT6 has any recall notices on our sister site AutoRecalls.co, sorted by model year.

View Cadillac CT6 Recalls ยป
Recall Notice Icon
Severity Icon 9/10

Error Icon P0700

Transmission Control System Malfunction

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Severity Icon 4/10

Error Icon P0128

Coolant Thermostat (Coolant Temp Below Thermostat Regulating Temperature)

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Severity Icon 8/10

Error Icon P0106

Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance Problem

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Error Icon P062F

Internal Control Module EEPROM Error

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Severity Icon 8/10

Error Icon P0606

ECM/PCM Processor Fault

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Severity Icon 4/10

Error Icon P0455

System Gross Leak Evaporative Emission

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Severity Icon 8/10

Error Icon P0306

Cylinder 6 Misfire Detected

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Error Icon P0160

O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 2)

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Error Icon P0206

Injector Circuit Malfunction - Cylinder 6

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Error Icon P0660

Intake Manifold Tuning Valve Control Circuit (Bank 1)

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Error Icon P0056

Heated Oxygen Sensor (HO2S) 2, Bank 2, Heater control - Circuit Malfunction

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Severity Icon 8/10

Error Icon P0068

MAP / MAF - Throttle Position Correlation

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Severity Icon 7/10

Error Icon P0171

System Too Lean (Bank 1)

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Severity Icon 7/10

Error Icon P0420

Catalyst System Efficiency Below Threshold (Bank 1)

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Severity Icon 8/10

Error Icon P0016

Crankshaft Position Camshaft Position Correlation Bank 1 Sensor A

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Error Icon P0690

ECM/PCM Power Relay Sense Circuit High

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Severity Icon 3/10

Error Icon P0496

Evaporative Emission System High Purge Flow

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Severity Icon 7/10

Error Icon P0010

Intake Camshaft Position Actuator Circuit / Open (Bank 1)

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Severity Icon 8/10

Error Icon P0017

Crankshaft Position Camshaft Position Correlation Bank 1 Sensor B

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Error Icon P0008

Engine Position System Performance - Bank 1

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Error Icon P1629

Internal Voltage Regulator Malfunction

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Error Icon P2176

Throttle Actuator Control System - Idle Position Not Learned

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Error Icon P0336

Crankshaft Position Sensor A Circuit Range/Performance

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Severity Icon 8/10

Error Icon P0301

Cylinder 1 Misfire Detected

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Severity Icon 6/10

Error Icon P0174

System Too Lean (Bank 2)

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Severity Icon 3/10

Error Icon P0446

Evaporative Emission Control System Vent Control Circuit Malfunction

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Error Icon P0018

Crankshaft Position Camshaft Position Correlation Bank 2 Sensor A

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Severity Icon 8/10

Error Icon P0776

Pressure Control Solenoid B Performance or Stuck off

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Error Icon P0856

Traction Control Input Signal

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Error Icon P0058

Heated Oxygen Sensor (HO2S) Heater Circuit High Voltage Bank 2 Sensor 2

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Error Icon P0989

Transmission Fluid Pressure Sensor/Switch E Circuit Low

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Error Icon P1467

A/C Compressor Temperature Sensor Malfunction

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Error Icon P1626

Theft Deterrent Fuel Enable Signal Not Received/ B+ Supply To VCRM A/C Circuit Malfunction

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Error Icon P0161

O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2)

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Error Icon U1016

SCP (J1850) Invalid or Missing Data for Primary Id

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Error Icon U1000

SCP (J1850) Invalid or Missing Data for Primary Id

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Error Icon P1644

Fuel Pump Speed Control Circuit Malfunction

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Error Icon P0024

Camshaft Position B - Timing Over-Advanced or System Performance (Bank 2)

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Severity Icon 4/10

Error Icon P0102

Mass or Volume Air Flow Circuit Low Voltage Input

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Severity Icon 7/10

Error Icon P0430

Catalyst System Efficiency Below Threshold (Bank 2)

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Severity Icon 4/10

Error Icon P0101

Mass or Volume Air flow Circuit Range/Performance Problem

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Error Icon B1325

Control Module Power Circuit Low/High Voltage

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Error Icon B1327

Passenger Door Ajar Circuit Failure

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Severity Icon 3/10

Error Icon P0440

Evaporative Emission Control System Malfunction

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Error Icon P0717

Input/Turbine Speed Sensor Circuit No Signal

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Severity Icon 8/10

Error Icon P0021

Intake Camshaft Position Timing - Over-Advanced (Bank 2)

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Error Icon U1096

SCP (J1850) Invalid or Missing Data for Primary Id

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Error Icon U0121

Lost Communication With Anti-Lock Brake System (ABS) Control Module

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Error Icon U1056

SCP (J1850) Invalid or Missing Data for Vehicle Configuration

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Severity Icon 9/10

Error Icon U0073

Control Module Communication Bus "A" Off

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Error Icon U0140

Lost Communication With Body Control Module

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Error Icon P1258

Pedal Correlation PDS1 and PDS2

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Error Icon P1101

MAF Sensor Out Of Self Test Range./KOER Not Able To Complete KOER Aborted

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Error Icon P1682

Ignition 1 Switch Circuit 2

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Error Icon P1634

Data Output Link Circuit Failure

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Error Icon P1153

HO2S Insufficient Switching Bank 2 Sensor 1

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Severity Icon 9/10

Error Icon P0011

Intake Camshaft Position Timing - Over-Advanced (Bank 1)

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Severity Icon 9/10

Error Icon P0012

Intake Camshaft Position Timing - Over-Retarded (Bank 1)

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Severity Icon 7/10

Error Icon P0013

Exhaust Camshaft Position Actuator Circuit / Open (Bank 1)

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Severity Icon 8/10

Error Icon P0014

Exhaust Camshaft Position Timing - Over-Advanced (Bank 1)

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Severity Icon 4/10

Error Icon P0036

Heated Oxygen Sensor (HO2S) Heater Control Circuit Bank 1 Sensor 2

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Severity Icon 8/10

Error Icon P0113

Intake Air Temperature Circuit High Input

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Severity Icon 6/10

Error Icon P0131

O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)

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Severity Icon 7/10

Error Icon P0134

O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)

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Severity Icon 6/10

Error Icon P0135

O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)

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Severity Icon 4/10

Error Icon P0137

O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)

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Severity Icon 6/10

Error Icon P0138

O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)

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Severity Icon 6/10

Error Icon P0141

O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

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Severity Icon 5/10

Error Icon P0172

System Too Rich (Bank 1)

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Severity Icon 5/10

Error Icon P0175

System Too Rich (Bank 2)

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Severity Icon 9/10

Error Icon P0300

Random/Multiple Cylinder Misfire Detected

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Severity Icon 8/10

Error Icon P0302

Cylinder 2 Misfire Detected

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Severity Icon 8/10

Error Icon P0303

Cylinder 3 Misfire Detected

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Severity Icon 8/10

Error Icon P0304

Cylinder 4 Misfire Detected

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Severity Icon 8/10

Error Icon P0305

Cylinder 5 Misfire Detected

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Severity Icon 3/10

Error Icon P0325

Knock Sensor 1 Circuit (Bank 2 or Single Sensor)

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Cadillac CT6 Image

About the CT6

The CT6 entered the market as the successor to the Cadillac Fleetwood in 2016. The model was only given a single generation before it was replaced by the Cadillac Celestiq in 2020.

While on the market, it represented the largest of the sedan offerings from the American carmaker, above both the CT4 and CT5.

Despite only having a single generation, it did have two notable variants – the CT6-V and CT6-V Blackwing. Both of these were high-performance sports sedans.

The most notable competition for the model came from the Acura RLX, Audi A8, BMW 7-Series, and Mercedes-Benz S Class.

One of the most common issues that CT6 owners faced is fault code P0700. This code indicates that there is a general problem with the transmission control system, which means that only models fitted with an automatic transmission can suffer this code.

In most cases, the code requires a more advanced code scanner to determine the source of the issue. Be sure to first address additional codes that relate to the transmission.

The next most common code is P0128. This code means that the engine coolant is not reaching its operational temperature quickly enough.

This code is so common that Cadillac had to acknowledge it and issue a technical service bulletin (TSB) for it. Unlike most P0128 codes, this was caused by an engine control unit issue, which could be fixed by reprogramming the control unit.

Another common fault code is P0106, which is logged when the MAP sensor is sending a signal that is outside of its allowable range.

Cadillac issued another TSB for this and a number of codes for a joint TSB. It is recommended that owners of models manufactured between 2016 and 2017 inspect their intake manifold bolts for looseness.