Front Height Sensor Signal Short to Ground
The Electronic Suspension Control Module (ESCM) has detected a short to ground in the signal circuit of the front height sensor. This sensor is a potentiometer powered by a 5V reference voltage. A short to ground in its signal wire prevents the module from reading the vehicle's actual ride height, disabling automatic leveling control and turning on the suspension warning light.
1. Commonly Affected Makes
2. Most Common Causes
- Front height sensor with internal short to ground
- Signal wire (typically gray/red or similar) chafed or pinched against chassis or body
- Corrosion, moisture, or bent pins in sensor or module connector causing a ground bridge
- Internal failure of the ESCM at the signal input pin (rare)
3. Symptoms You Will Notice
- Suspension warning light illuminated on the dashboard
- Automatic ride height leveling disabled; vehicle may sit unevenly
4. Step-by-Step Diagnosis
Scan for OBD2 code C1759 and verify it is active.
Visually inspect front height sensor wiring for chafing, pinching, or damage.
Disconnect sensor and measure resistance between signal pin and ground; if low, sensor is shorted.
Check connector pins for corrosion, moisture, or bent terminals.
If wiring and sensor are good, test signal voltage at ESCM connector; if still shorted, suspect module failure.
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, but the suspension will not self-level, which may affect handling and ride comfort. Have it repaired soon to avoid uneven tire wear or additional strain on suspension components.
How much does it cost to fix?▼
Typically $150–$400 for a sensor replacement, including parts and labor. Wiring repairs may cost $100–$300. Module replacement is rare but could exceed $800.