C1888: Rear Right Height Sensor Short to Ground
Diagnostic trouble code C1888 indicates a short to ground in the rear right air suspension height sensor circuit. This sensor monitors the body-to-axle position and sends a voltage signal to the air suspension module. When the module detects the signal voltage is near zero (below the expected range), it sets this code, typically due to wiring contacting ground or an internal sensor failure. The system may disable the suspension to prevent damage, causing the vehicle to lower to its minimum height or ride unevenly.
1. Commonly Affected Makes
2. Most Common Causes
- Faulty rear right suspension height sensor (internal short)
- Sensor circuit wiring shorted to ground (chassis)
- Corroded, bent, or pushed-back terminals in the sensor connector
- Suspension wiring harness chafed or damaged from rubbing
- Faulty air suspension control module (rare)
3. Symptoms You Will Notice
- Vehicle sits lower than normal, especially at the rear right corner
- Air suspension warning light illuminated on the dashboard
- Rough or uneven ride quality
- Suspension system may become inoperative or stuck in limp mode
4. Step-by-Step Diagnosis
Scan for additional codes and note freeze frame data
Visually inspect the rear right height sensor connector and wiring for damage, corrosion, or chafing
Disconnect the sensor and measure resistance between signal and ground; a short indicates wiring or sensor issue
Check for battery voltage and ground at the sensor connector with the key on
If wiring is intact, test the sensor by substituting a known-good unit or measuring its internal resistance
5. Frequently Asked Questions
Is it safe to drive?▼
Driving is not recommended because the suspension may drop to minimum height, causing poor handling and potential damage to other components. Have the vehicle towed to a repair shop.
How much does it cost to fix?▼
Repair costs typically range from $200 to $600, depending on whether the sensor ($100-$250) or wiring repair is needed, plus labor.