TORQDEX // OBD-II REFERENCE
OBD-II Trouble Codes
Look up a diagnostic trouble code, understand what system triggered it, and work through the fault logically before replacing parts.
01 // READ THE CODE
What the first letter means
The first character identifies the general system where the diagnostic trouble code originated.
Powertrain
Engine, transmission, fuel, ignition, emissions, and related powertrain systems.
Body
Body electronics, climate systems, restraint systems, seats, lighting, and related control modules.
Chassis
ABS, steering, suspension, braking, and other chassis-related systems.
Network
Communication faults between control modules and vehicle data networks.
04 // FULL DATABASE
Browse the TorqDex OBD-II database
Explore trouble codes by system and code family, including fuel, ignition, emissions, electrical, and transmission faults.
03 // COMMON POWERTRAIN CODES
Popular code lookups
Start with some of the most commonly encountered powertrain trouble codes.
04 // FULL DATABASE
Browse the full OBD-II database
Explore TorqDex trouble codes by system, including fuel, ignition, emissions, electrical, and transmission faults.
TORQDEX // DIAGNOSTIC PRINCIPLE
A code points to a problem. It does not condemn a part.
Diagnostic trouble codes report conditions detected by vehicle control modules. Wiring faults, vacuum leaks, mechanical failures, sensor problems, low system voltage, and other causes can produce similar codes. Confirm the fault with testing before replacing components.