C1426: RR Shock Circuit Short to Battery
Diagnostic trouble code C1426 indicates that the control module has detected an abnormally high voltage on the rear right shock absorber circuit, specifically a short to battery power. This code applies to vehicles equipped with adaptive or electronically controlled suspension systems. The suspension control module continuously monitors the resistance and voltage of each shock actuator circuit to identify electrical faults that could compromise damping control.
1. Commonly Affected Makes
2. Most Common Causes
- Short to battery power in the rear right shock absorber circuit wiring
- Internal short circuit or altered resistance in the rear right shock solenoid
- Damaged connector or harness with pins contacting battery voltage
- Faulty suspension control module with internal detection error
- Corrosion in connectors causing abnormal electrical bridges
3. Symptoms You Will Notice
- Illuminated check engine or suspension warning light
- Reduced ride quality or abnormal damping behavior
4. Step-by-Step Diagnosis
Scan for additional codes and verify C1426 is present
Visually inspect the rear right shock connector and wiring for damage, corrosion, or shorts to battery
Measure voltage at the shock actuator connector with key on; should be within specified range (typically 0-5V or 12V depending on system)
Check resistance of the shock solenoid; compare to manufacturer specifications
If wiring and actuator test OK, suspect the suspension control module and perform further diagnostics per service manual
5. Frequently Asked Questions
Is it safe to drive?▼
Driving is possible but not recommended for extended periods. The suspension may not adjust properly, leading to reduced handling and comfort. Have the issue diagnosed promptly.
How much does it cost to fix?▼
Repair costs typically range from $200 to $800, depending on whether the issue is a simple wiring repair or requires replacement of the shock absorber or control module.