OBD2 Car ScannerWhat does P2518 mean?
P2518 stands for A/C Refrigerant Pressure Sensor B Circuit High. The engine computer has found a problem with vehicle speed signals, idle control or another sensor input.
Powertrain codes cover the engine, transmission and emissions. When the car's computer sees a reading outside its normal range, it stores this code and may turn on a warning light on the dashboard.
Common causes
- Faulty vehicle speed sensor
- Dirty throttle body or idle air control valve
- Faulty switch or sensor
- Damaged wiring or connector
What to do
- Read all stored and pending codes with a scanner. Several codes together often point to one cause.
- Note the freeze frame data (speed, temperature, load) recorded when the code was set.
- Inspect the wiring and connectors of the part named in the code for damage, corrosion or looseness.
- Fix the most likely and cheapest cause first, then clear the code and drive to see if it comes back.
Read this code from your own car
Plug in a cheap ELM327 adapter and the app shows every fault code, what it means and how to fix it.
Frequently asked questions
What does P2518 mean?
P2518 means “A/C Refrigerant Pressure Sensor B Circuit High”. It belongs to the speed, idle control and inputs group: The engine computer has found a problem with vehicle speed signals, idle control or another sensor input.
Is it safe to drive with P2518?
You can usually drive carefully for a short time, but fix it soon to avoid further damage or higher fuel use.
How do I clear P2518?
Fix the cause, then clear the code with an OBD2 scanner or app. If the fault is still there, the code will come back.
Related codes
- P250FEngine Oil Level Too Low
- P2515A/C Refrigerant Pressure Sensor B Circuit
- P2516A/C Refrigerant Pressure Sensor B Circuit Range/Performance
- P2517A/C Refrigerant Pressure Sensor B Circuit Low
- P252AEngine Oil Quality Sensor Circuit
- P252BEngine Oil Quality Sensor Circuit Range/Performance
- P252CEngine Oil Quality Sensor Circuit Low
- P252DEngine Oil Quality Sensor Circuit High
Code meanings can vary by manufacturer. This page is general guidance, not a repair manual. Always confirm the cause before replacing parts.