B2466
Low Severity (Level 2)Aux Heater Overheat Counter Overrun/System Locked
B2466 usually means aux Heater Overheat Counter Overrun/System Locked.
Can you still drive with B2466?
⚠️Short-distance driving is usually OK, but have this diagnosed within a week to prevent further damage.
Typical repair cost: $50 – $400
Severity Level 2 — Low
This code indicates a minor issue that is unlikely to cause immediate driveability problems. You can typically continue driving but should have the vehicle inspected at your earliest convenience.
Common Symptoms
- Warning light or malfunction indicator related to the heater system is illuminated
- The heater system is not operating as designed
- Diagnostic trouble code (DTC) stored in module memory
- Fault may be intermittent — code may clear itself and reappear
- Reduced vehicle functionality related to the heater system
Possible Causes
- Faulty heater control valve — most common cause, test before replacing
- Damaged or corroded wiring/connector in the heater system circuit
- Blown fuse or faulty relay for the heater 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 ($49-141 at shop, free at auto parts store for basic scan)
- Visually inspect the heater system wiring harness and connectors — look for chafed wires, melted insulation, green corrosion, loose pins, or rodent damage (often free to check yourself, $135 diagnostic fee at shop)
- Replace heater control valve if testing confirms it has failed — use OEM quality, avoid the cheapest no-name aftermarket parts that fail in a year ($50-400)
- Check and replace any blown fuses in the heater system fuse circuit — if fuse blows again, there's still a short that needs to be found ($1-20 for fuses)
- Perform a wiggle test on the heater system wiring harness while monitoring live data — see if the fault returns when you move the harness at different points ($0-137 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 B2466 mean?
B2466 stands for "Aux Heater Overheat Counter Overrun/System Locked". B2466 usually means aux Heater Overheat Counter Overrun/System Locked.
Can you drive with B2466?
Short-distance driving is usually OK, but have this diagnosed within a week to prevent further damage.
How much does it cost to fix B2466?
Repair costs for B2466 typically range from $50 to $400, 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 ($49-141 at shop, free at auto parts store for basic scan); Visually inspect the heater system wiring harness and connectors — look for chafed wires, melted insulation, green corrosion, loose pins, or rodent damage (often free to check yourself, $135 diagnostic fee at shop); Replace heater control valve if testing confirms it has failed — use OEM quality, avoid the cheapest no-name aftermarket parts that fail in a year ($50-400).
Will B2466 clear itself?
Explore Repair Costs
Related OBD-II Codes
These codes are in the same range as B2466 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 B2466 discussions in the community