Seat Recline Motor Memory Position Out of Range
Your car's seat recline motor has lost track of where it should be positioned, like a thermostat that forgot its target temperature. The seat control system can't find the correct memory position and needs to be reset or repaired.
The ECU monitors the seat recline motor's position sensor feedback and compares it against stored memory positions. When the actual position deviates beyond acceptable limits from the expected range, the fault code triggers. The system uses potentiometer or encoder signals to verify motor movement matches commanded positions.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Recline Position Feedback | Within ±5% of stored memory position | Exceeds ±5% deviation or sensor signal absent |
| Motor Response Time | Position change detected within 2 seconds | No position change after 3+ seconds of motor command |
Code B2158 is a low-severity fault. Your vehicle is generally safe to drive to a workshop for diagnosis. However, do not ignore it indefinitely — low-severity codes often indicate developing problems that become expensive if neglected. Book a diagnostic appointment within 2–4 weeks. If you notice any additional symptoms (rough running, power loss, unusual smells), treat it as higher priority.
Once the fault is repaired, B2158 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.