Seat Track Position Switch Circuit Resistance Out of Range
The seat track position sensor is sending an electrical signal that's either too weak or too strong, like a radio station that's not tuned correctly. The vehicle's computer can't properly detect where the seat is positioned along its track.
The ECU monitors the resistance output from the seat track position switch as the seat moves forward and backward. It expects a specific resistance range that correlates to seat position. If resistance falls outside this range, the ECU cannot accurately determine seat location and sets the fault code.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Switch Resistance | Typically 0-5 kΩ (varies by manufacturer) | Below 0 kΩ or above 10 kΩ (open/short circuit) |
| Signal Voltage | 0.5V to 4.5V | Below 0.5V or above 4.5V |
Code C1948 is classified as a serious fault. If your check engine light is flashing — not just steady — pull over safely and do not continue driving. A flashing CEL indicates an active misfire or critical failure that can cause catalytic converter damage within minutes or permanent engine harm within miles. Contact a certified mechanic immediately. Do not attempt roadside repairs on high-severity codes unless you are trained to do so.
Once the fault is repaired, C1948 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.