B2428
Low Severity (Level 2)A/C Post Heater Sensor #2 Circuit Failure
B2428 usually means a/C Post Heater Sensor #2 Circuit Failure.
Can you still drive with B2428?
⚠️Short-distance driving is usually OK, but have this diagnosed within a week to prevent further damage.
Typical repair cost: $50 – $800
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
- Climate control not functioning as expected
- A/C or heat output inconsistent — temperature won't adjust
- Blower motor not working or only working on certain speeds
- Diagnostic trouble code (DTC) stored in module memory
Possible Causes
- Failed blower motor — internal fault from age, heat cycling, and vibration
- Damaged wiring or corroded connector in the climate control / HVAC system circuit
- Blown fuse for the climate control / HVAC system circuit — check before replacing components
- Faulty control module driving the blower motor
- Loose or corroded ground point shared by the climate control / HVAC system
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 ($5-146 at shop, free at auto parts store for basic scan)
- Visually inspect the climate control / HVAC system wiring harness and connectors — look for chafed wires, melted insulation, green corrosion, loose pins, or rodent damage (often free to check yourself, $123 diagnostic fee at shop)
- Replace blower motor if testing confirms it has failed — use OEM quality, avoid the cheapest no-name aftermarket parts that fail in a year ($50-800)
- Check and replace any blown fuses in the climate control / HVAC system fuse circuit — if fuse blows again, there's still a short that needs to be found ($1-10 for fuses)
- Perform a wiggle test on the climate control / HVAC system wiring harness while monitoring live data — see if the fault returns when you move the harness at different points ($0-134 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 B2428 mean?
B2428 stands for "A/C Post Heater Sensor #2 Circuit Failure". B2428 usually means a/C Post Heater Sensor #2 Circuit Failure.
Can you drive with B2428?
Short-distance driving is usually OK, but have this diagnosed within a week to prevent further damage.
How much does it cost to fix B2428?
Repair costs for B2428 typically range from $50 to $800, 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 ($5-146 at shop, free at auto parts store for basic scan); Visually inspect the climate control / HVAC system wiring harness and connectors — look for chafed wires, melted insulation, green corrosion, loose pins, or rodent damage (often free to check yourself, $123 diagnostic fee at shop); Replace blower motor if testing confirms it has failed — use OEM quality, avoid the cheapest no-name aftermarket parts that fail in a year ($50-800).
Will B2428 clear itself?
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