What Does B2562 Mean?
This diagnostic trouble code indicates that the body control module (BCM) or climate control module has detected a short to ground in the auxiliary air conditioning blower motor speed 1 circuit. This typically affects rear or auxiliary HVAC systems in larger vehicles with dual climate control zones. The control module detected abnormally low resistance or voltage on the blower motor control circuit, indicating the circuit is making unintended contact with vehicle ground.
Common Causes
40%
Damaged or chafed wiring harness causing the blower motor control wire to contact chassis ground
30%
Failed auxiliary blower motor with internal short to ground in motor windings or brush assembly
20%
Faulty blower motor resistor or power module with internal short circuit
10%
Corroded or damaged connector terminals at blower motor or control module allowing water intrusion and ground fault
Diagnostic Steps
1
Step 1: Perform visual inspection of auxiliary blower motor wiring harness from control module to motor, checking for obvious damage, chafing, melted insulation, or wire pinch points especially near mounting brackets and body penetrations
2
Step 2: Disconnect auxiliary blower motor connector and measure resistance from the speed 1 control wire terminal (at harness side) to chassis ground using digital multimeter - should read open circuit (OL or infinite resistance); if reading shows continuity or low resistance, wiring harness has short to ground
3
Step 3: With blower motor still disconnected, measure resistance across blower motor terminals - compare to manufacturer specifications (typically 0.5-5 ohms depending on speed circuit); check resistance from motor case to each terminal which should read open circuit, if continuity exists motor has internal short
4
Step 4: Inspect and test blower motor resistor/power module by removing it and checking for signs of burning, corrosion, or physical damage; use multimeter to verify circuit isolation between control input terminals and ground mounting surface
5
Step 5: If all components test good, inspect control module connector for corrosion, pushed-back pins, or water damage; verify proper connector seating and terminal tension
6
Step 6: After repairs, clear codes and operate auxiliary blower at speed 1 setting for at least 5 minutes while monitoring live data to confirm proper voltage and current draw, verify DTC does not return
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
This diagnostic trouble code indicates that the body control module (BCM) or climate control module has detected a short to ground in the auxiliary air conditioning blower motor speed 1 circuit. This typically affects rear or auxiliary HVAC systems in larger vehicles with dual climate control zones....
The most common cause of B2562 (Aux A/C Blower Speed 1 Circuit Short to Ground) is: Damaged or chafed wiring harness causing the blower motor control wire to contact chassis ground
Typical repair costs for B2562 range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This code does not present a safety concern and the vehicle is safe to drive. The auxiliary blower will be inoperative or operate improperly, affecting passenger comfort in rear seating areas but not affecting primary vehicle operation or safety systems.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2562 to identify the root cause.
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Quick Info
Category
Body
System
Climate Control System (Auxiliary HVAC)
Difficulty
Type
Generic (SAE)
Recommended Tools
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