Goodman furnace code b2: Motor Horsepower Mismatch
Professional repair
What does b2 mean on a Goodman furnace? The connected motor's horsepower doesn't match the shared data set — the furnace refuses to run. Fix: correct motor, or correct data via the proper memory card.
Before you touch anything: the six signs that mean stop troubleshooting and call a pro →
Verify motor part number vs. model; reload correct shared data.
What causes it (in order of likelihood)
- Wrong replacement motor or wrong data set TECH
Parts for this code
No specific part number is verified for this code — it typically points at wiring, power, a blown fuse, or communication between components rather than one standard replacement part. If your diagnosis does land on a replaceable component, match its part number against your model's parts list before ordering.
Questions about this code
What does b2 mean on a Goodman furnace?
The connected motor's horsepower doesn't match the shared data set — the furnace refuses to run. Fix: correct motor, or correct data via the proper memory card.
How do I fix Goodman furnace code b2?
It can follow a motor or memory card change. A technician should verify the motor part number against the model and load the correct data.
How much does it cost to fix Goodman furnace code b2?
Cost depends on whether the motor or the data needs correcting. If this appeared right after a repair, ask whoever did the work to review it.
Applies to
GMVC96 · GCVC96
Different Goodman generations use different code maps. If your series isn't listed, don't assume this meaning — check your blower-door label.
Same control platform, same code: Amana furnace code b2
Verified against Goodman GMVC96/GCVC96 Service Manual, p.45
Last verified 2026-07-06 · page updated 2026-10-03 · how we verify
Related Goodman furnace codes
These codes use the same dual 7-segment display (two-stage variable-speed) system.
| Pattern | Meaning |
|---|---|
| b1display b1 | ECM Motor Communications Lost (b1) |
| b3display b3 | ECM Motor in a Limiting Condition (b3) |
| b0display b0 | ECM Blower Motor Not Running (b0) |
| b4display b4 | Motor Trips (b4) |