B2518
Moderate Severity (Level 3)Compressor Overtemp Fault
B2518 usually means compressor Overtemp Fault.
Can you still drive with B2518?
⚠️Short-distance driving is usually OK, but have this diagnosed within a week to prevent further damage.
Typical repair cost: $300 – $1800
Severity Level 3 — Moderate
This code indicates a moderate issue that may affect vehicle performance and fuel economy. Continued driving is possible in most cases, but prompt diagnosis and repair are recommended to prevent further damage.
Common Symptoms
- Check Engine Light illuminated
- Blower motor not working or only working on certain speeds
- A/C or heat output inconsistent — temperature won't adjust
- Diagnostic trouble code (DTC) stored in module memory
Possible Causes
- Faulty A/C compressor — most common cause, test before replacing
- Damaged or corroded wiring/connector in the A/C compressor system circuit
- Blown fuse or faulty relay for the A/C compressor system
- Poor ground connection — check and clean all related ground points
- Control module fault — rare but possible, only consider after ruling out simpler causes
Common Fixes
- Scan vehicle with a professional-grade OBD2 scanner to read all stored codes and freeze frame data — note the conditions when the code set ($10-98 at shop, free at auto parts store for basic scan)
- Visually inspect the A/C compressor system wiring harness and connectors — look for chafed wires, melted insulation, green corrosion, loose pins, or rodent damage (often free to check yourself, $133 diagnostic fee at shop)
- Replace A/C compressor if testing confirms it has failed — use OEM quality, avoid the cheapest no-name aftermarket parts that fail in a year ($300-1800)
- Check and replace any blown fuses in the A/C compressor system fuse circuit — if fuse blows again, there's still a short that needs to be found ($1-17 for fuses)
- Perform a wiggle test on the A/C compressor system wiring harness while monitoring live data — see if the fault returns when you move the harness at different points ($0-108 diagnostic labor)
Estimated Repair Cost
These are estimated costs based on generic repair data. Actual costs may vary depending on your vehicle, location, and labor rates.
Frequently Asked Questions
What does B2518 mean?
B2518 stands for "Compressor Overtemp Fault". B2518 usually means compressor Overtemp Fault.
Can you drive with B2518?
Short-distance driving is usually OK, but have this diagnosed within a week to prevent further damage.
How much does it cost to fix B2518?
Repair costs for B2518 typically range from $300 to $1800, depending on your vehicle make, model, and local labor rates. Common fixes include: Scan vehicle with a professional-grade OBD2 scanner to read all stored codes and freeze frame data — note the conditions when the code set ($10-98 at shop, free at auto parts store for basic scan); Visually inspect the A/C compressor system wiring harness and connectors — look for chafed wires, melted insulation, green corrosion, loose pins, or rodent damage (often free to check yourself, $133 diagnostic fee at shop); Replace A/C compressor if testing confirms it has failed — use OEM quality, avoid the cheapest no-name aftermarket parts that fail in a year ($300-1800).
Will B2518 clear itself?
Related Repair Costs
Explore Repair Costs
Related OBD-II Codes
These codes are in the same range as B2518 and often share similar causes and fixes.
Worried about repair costs?
Get transparent estimates and verify your mechanic's quote before authorizing repairs.
Related Discussions
See what other car owners are saying about this code and related repairs.
View B2518 discussions in the community