Driver Seat Recline Motor Stalled
The B1666 code indicates a manufacturer-specific fault where the driver seat control module detects that the recline motor has stalled or become blocked during operation. This happens when the module sends voltage to adjust the seatback but does not receive the expected electrical feedback indicating normal motor rotation, or it detects an abnormal current spike typical of a seized motor. The stall detection is typically based on missing position sensor signals (potentiometers or limit switches) or motor circuit current monitoring. If the motor fails to reach the commanded position within the expected time or exceeds the safe amperage limit, the module sets code B1666 and disables the recline function to prevent circuit overheating.
1. Commonly Affected Makes
2. Most Common Causes
- Damaged or internally shorted driver seat recline motor
- Physically stuck or corroded recline mechanism (gears, rods, or tracks)
- Motor wiring shorted to ground, shorted to voltage, or open circuit
- Loose, corroded, or poor electrical connections in the seat harness
- Damaged seat control module
3. Symptoms You Will Notice
- Driver seatback does not recline or adjust
- Recline function works intermittently or stops mid-travel
4. Step-by-Step Diagnosis
Check for any obvious mechanical binding in the seat recline mechanism
Inspect the seat wiring harness for damage, corrosion, or loose connections
Test the recline motor by applying direct battery voltage to see if it runs
Measure motor circuit resistance and check for shorts or opens
Verify position sensor signals (if applicable) with a scan tool
If all else is good, consider replacing the seat control module
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is safe to drive. The seat will remain in its current position, but you will not be able to adjust the recline until the issue is fixed.
How much does it cost to fix?▼
Repair costs typically range from $150 to $600, depending on whether the motor, wiring, or control module needs replacement.