📚Code Reference

OBD-II Code Library

Browse 50+ standardized OBD-II fault codes organized by system. Click any code to run a full algorithmic P-Code analysis for your vehicle.

60 codes found

P0016Deep Dive

Crankshaft/Camshaft Position Sensor Correlation

High
P0030Deep Dive

HO2S Heater Control Circuit (Bank 1, Sensor 1)

Low
P0101Deep Dive

Mass Air Flow (MAF) Sensor Performance

Medium
P0102Deep Dive

Mass Air Flow Sensor Circuit Low Input

Medium
P0113Deep Dive

Intake Air Temperature Sensor 1 Circuit High

Low
P0117Deep Dive

Engine Coolant Temperature Sensor Circuit Low

Medium
P0128Deep Dive

Coolant Thermostat Below Regulating Temperature

Low
P0130Deep Dive

O2 Sensor Circuit (Bank 1, Sensor 1)

Medium
P0171Deep Dive

System Too Lean (Bank 1)

Medium
P0172Deep Dive

System Too Rich (Bank 1)

Medium
P0174Deep Dive

System Too Lean (Bank 2)

Medium
P0175Deep Dive

System Too Rich (Bank 2)

Medium
P0300Deep Dive

Random/Multiple Cylinder Misfire Detected

High
P0301Deep Dive

Cylinder 1 Misfire Detected

High
P0302Deep Dive

Cylinder 2 Misfire Detected

High
P0303Deep Dive

Cylinder 3 Misfire Detected

High
P0304Deep Dive

Cylinder 4 Misfire Detected

High
P0305Deep Dive

Cylinder 5 Misfire Detected

High
P0306Deep Dive

Cylinder 6 Misfire Detected

High
P0325Deep Dive

Knock Sensor 1 Circuit (Bank 1)

Medium
P0340Deep Dive

Camshaft Position Sensor "A" Circuit (Bank 1)

High
P0401Deep Dive

EGR (Exhaust Gas Recirculation) Flow Insufficient

Low
P0420Deep Dive

Catalyst System Efficiency Below Threshold (Bank 1)

Medium
P0430Deep Dive

Catalyst System Efficiency Below Threshold (Bank 2)

Medium
P0440Deep Dive

Evaporative Emission System Malfunction

Low
P0441Deep Dive

Evaporative Emission System Incorrect Purge Flow

Low
P0442Deep Dive

Evaporative Emission System Leak Detected (Small)

Low
P0455Deep Dive

Evaporative Emission System Leak Detected (Large)

Medium
P0500Deep Dive

Vehicle Speed Sensor "A" Malfunction

Medium
P0505Deep Dive

Idle Control System Malfunction

Medium
P0507Deep Dive

Idle Control System RPM High

Medium
P0562Deep Dive

System Voltage Low

High
P0606Deep Dive

PCM/ECM/ECU Internal Communication Error

High
P0700Deep Dive

Transmission Control System (MIL Request)

Medium
P0720Deep Dive

Output Speed Sensor Circuit Malfunction

Medium
P0740Deep Dive

Torque Converter Clutch Circuit Malfunction

Medium
C0031

Right Front Wheel Speed Sensor Circuit

High
C0034

Left Front Wheel Speed Sensor Circuit

High
C0037

Right Rear Wheel Speed Sensor Circuit

High
C0040

Left Rear Wheel Speed Sensor Circuit

High
C0110

ABS Motor Circuit Malfunction

High
C0131

ABS Pressure Circuit Failure

High
C0200

Right Front Wheel Speed Sensor Circuit Failure

High
C0265

ABS Actuator Relay Circuit Open

High
B0001

Frontal Crash Deployment Loop (Stage 1) Open

High
B0002

Frontal Crash Deployment Loop (Stage 2) Open

High
B0010

Right Frontal Crash Sensor 1 Circuit Failure

High
B0020

Left Frontal Crash Sensor 1 Circuit Failure

High
B1000

ECU Hardware Malfunction

High
B1318

Battery Voltage Low

Medium
B1342

ECU Defective or EEPROM Memory Error

High
B1600

PATS Ignition Key Transponder Signal Failure

Medium
U0001

High Speed CAN Communication Bus Open

High
U0100

Lost Communication With ECM/PCM "A"

High
U0101

Lost Communication With TCM

High
U0121

Lost Communication With ABS Control Module

High
U0140

Lost Communication With Body Control Module

High
U0155

Lost Communication With Instrument Panel Cluster

Medium
U0159

Lost Communication With Parking Assist Control Module

Low
U0184

Lost Communication With Radio

Low