C1797: RR Air Spring Solenoid Short to B+
The C1797 code indicates that the Air Suspension Control Module (SCM or VDM, depending on the model) has detected a short circuit to battery voltage (B+) in the output circuit of the right rear (RR) air spring/shock solenoid. This prevents the module from properly controlling air pressure in that corner, typically disabling the load-leveling system.
1. Commonly Affected Makes
2. Most Common Causes
- Internal short to positive in the right rear air spring solenoid
- Chafed or pinched wiring in the RR solenoid control circuit contacting a 12V source (damaged harness)
- Corrosion or terminal bridging between power and control pins at the solenoid or module connector
- Internal output driver failure in the Suspension Control Module (SCM/VDM)
3. Symptoms You Will Notice
- Vehicle leans or sags on the right rear side
- Air suspension warning light illuminated on the dash
- Load-leveling system inoperative or disabled
4. Step-by-Step Diagnosis
Scan for additional codes and verify C1797 is current
Visually inspect the RR air spring solenoid connector and wiring harness for damage, chafing, or corrosion
Measure voltage at the RR solenoid control circuit with key on; if battery voltage is present when it should be low, suspect a short to B+
Disconnect the RR solenoid and check for short to B+ in the harness; if short disappears, the solenoid is likely faulty
If harness and solenoid check good, test the SCM/VDM output driver or replace the module
5. Frequently Asked Questions
Is it safe to drive?▼
You can drive short distances, but the vehicle may sag on one side and the load-leveling system will be disabled. Avoid heavy loads or high speeds until repaired.
How much does it cost to fix?▼
Repair costs range from $150 to $800, depending on whether the issue is a simple wiring repair ($150-$300), a solenoid replacement ($300-$500), or a module replacement ($500-$800).