Air Suspension Rear Height Sensor High (SE) Signal Circuit Short To Battery
The rear air suspension height sensor is sending a signal that's too high, as if it's shorted directly to the vehicle's battery power. Think of it like a water level sensor that's stuck reading maximum when the tank isn't actually full.
The ECU monitors the analog voltage signal from the rear height sensor, which should vary between 0.5V and 4.5V based on suspension position. A short to battery pulls the signal to maximum voltage (12V+), causing the ECU to interpret the suspension as being at maximum height regardless of actual position. The module compares this signal against expected voltage ranges and triggers a fault when voltage stays abnormally high.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Sensor Signal Voltage | 0.5V to 4.5V (proportional to height) | Above 5.0V (shorted to battery) |
| Signal Duration | Stable within range for 2+ seconds | Continuously maxed above 5.0V |
Code C1762 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, C1762 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.