What is the OBD2 code?
An OBD2 code is a diagnostic trouble code stored by a vehicle’s on-board diagnostics computer system when it detects a problem with the vehicle. OBD2 codes consist of a five-digit alphanumeric identifier corresponding to a specific issue, which can help identify the faulty component or system. Diagnosing OBD2 codes is a starting point for further troubleshooting and repair.
OBD2 Error Codes Lookup
Below is a list of some of the most common OBD2 codes and their typical causes. Diagnosing and resolving these codes can help prevent further damage to the vehicle and keep your car running smoothly.
While this list provides an overview of typical issues associated with each code, specific causes may vary depending on your vehicle’s year, make, and model. Always refer to a vehicle-specific OBD2 code manual for accurate diagnostic and repair information on your vehicle.
C codes
P codes
| P000A | “A” Camshaft Position Slow Response |
| P0001 | Fuel Volume Regulator Control Circuit/Open |
| P0008 | “A” Camshaft Position Actuator Circuit/Open |
| P0010 | “A” Camshaft Position Actuator Circuit (Bank 1) |
| P0011 | Nissan Code – Camshaft Timing for The Intake Side of Bank 1 |
| P0118 | Engine Coolant Temperature Sensor 1 Circuit High |
| P0122 | Throttle Position Sensor/Switch A Circuit Low Input |
| P0128 | Engine Coolant Temperature Below Thermostat Regulating Temperature |
| P0139 | Oxygen Sensor Circuit Slow Response |
| P0171 | System Too Lean Bank 1 |
| P0175 | System Too Rich Bank 2 |
| P0230 | Fuel Pump Primary Circuit Malfunction |
| P2810 | Pressure Control Solenoid G Electrical |
| P0300 | Multiple Cylinder Misfire Detected |
| P0302 | Cylinder 2 Misfire Detected |
| P0304 | Cylinder 4 Misfire Detected |
| P0332 | Knock Sensor 2 Low Circuit Input (Bank 2) |
| P0335 | Crankshaft Position “A” Circuit Malfunction |
| P0340 | Camshaft Position Sensor “A” Circuit |
| P0401 | Exhaust Gas Recirculation Flow Insufficient Detected |
| P0403 | Exhaust Gas Recirculation (EGR) “A” Control Circuit Malfunction |
| P0420 | Catalyst System Low Efficiency |
| P0430 | Catalyst System Efficiency Below Threshold (Bank 2) |
| P0446 | Evaporative Emission System Vent Control Circuit |
| P0456 | Evaporative Emission System Small Leak Detected |
| P0496 | EVAP Flow During a Non-Purge Condition |
| P0500 | Vehicle Speed Sensor |
| P0520 | Engine Oil Pressure Sensor/Switch “A” Circuit |
| P0524 | Engine Oil Pressure Too Low |
| P059F | Active Grille Shutter Performance Issues |
| P06DD | Engine Oil Pressure Control Circuit Stuck Off |
| P0700 | Transmission Control System Malfunction |
| P1135 | Air/Fuel Ratio Sensor Heater Circuit for Bank 1, Sensor 1 |
| P1171 | Fuel System Lean During Acceleration |
| P1326 | Knock Sensor Detection System |
| P1450 | Cannot Bleed Up Fuel Tank Vacuum |
| P1656 | Toyota Code – Oil Control Valve Circuit Malfunction |
| P1716 | Turbine Revolution Sensor |
| P1778 | Transmission Reverse I/P Circuit Malfunction |
| P219A | Fuel Trim Cylinder Balance Bank 1 |
| P3400 | Cylinder Deactivation System Bank 1 |
U codes
Frequently Asked Questions (FAQs)
What are the codes for OBD2?
OBD2 codes are 5-digit alphanumeric codes beginning with a letter (B, C, P, or U) followed by four digits corresponding to a specific issue detected by the vehicle’s computer.
Does an OBD2 scanner read all codes?
An OBD2 scanner can read all emission-related diagnostic trouble codes (DTCs) stored in a vehicle’s on-board computer system. However, there are different levels of OBD2 scanners – basic vs. professional.
Basic OBD2 scanners can only read generic codes which are P, B, C and U codes. Professional-grade scanners can access enhanced and manufacturer-specific codes.
What are the 10 modes of OBD2?
The 10 modes of OBD2 are:
1) Data stream
2) Freeze frame
3) Read diagnostic trouble codes
4) Clear diagnostic trouble codes
5) Read vehicle information
6) Read pending codes
7) Read permanent diagnostic trouble codes
8) Read manufacturer-specific data
9) Read emissions-related data
10) Read anti-lock brake system data
Is it OK to erase DTC codes?
It’s generally not recommended to erase DTC codes until the underlying problem is properly diagnosed and resolved, otherwise, the code will likely reappear.
How many OBD2 codes are there?
There are thousands of different OBD2 codes. The exact number can vary by vehicle make and model.
Is OBD and OBD2 the same?
OBD (on-board diagnostics) refers to the predecessor to the newer OBD2 system. OBD2 is a more advanced, standardized diagnostics system.
Can You Read OBD Codes Without a Scanner?
Most OBD2 vehicles will display simple generic codes without a scanner by flashing the check engine light on the vehicle’s dashboard. However, a pro-level scanner is needed to read manufacturer-specific codes.
Does the car need to be on for OBD2?
The car generally doesn’t need to be turned on for OBD2 scanners to access the diagnostic data. However, the engine typically needs to be started if you want to access advanced live data and diagnostics.