C1921 — VAPS Solenoid Actuator Output Circuit Failure

What Does C1921 Mean?

C1921 is a manufacturer-specific diagnostic trouble code: VAPS Solenoid Actuator Output Circuit Failure. This code applies to OTHER vehicles. Unlike generic OBD-II codes, manufacturer-specific codes are defined by the vehicle maker and may only apply to certain makes and models.

Symptoms of C1921

⚠️ Warning light on
⚠️ ABS or stability control issues

Frequently Asked Questions

What does C1921 mean?

VAPS Solenoid Actuator Output Circuit Failure. This is a manufacturer-specific code for OTHER vehicles.

Which vehicles get code C1921?

This code appears primarily in OTHER vehicles. Check your owner's manual or a dealer for model-specific information.

Can I fix this myself?

Manufacturer-specific codes often require a brand-specific diagnostic scanner for full data. A dealer or specialist with the right tools will diagnose it most accurately.

What To Do Next

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

Related Codes

C1900 Steering VAPS II Circuit Loop Short To Ground C1901 Ride Control RR Shock Actuator Circuit Failure C1902 Ride Control RR Shock Actuator Circuit Open C1903 Ride Control RR Shock Actuator Circuit Short To Battery C1904 Ride Control RR Shock Actuator Circuit Short To Ground C1905 Ride Control LR Shock Actuator Circuit Failure C1906 Ride Control LR Shock Actuator Circuit Open C1907 Ride Control LR Shock Actuator Circuit Short To Battery C1908 Ride Control LR Shock Actuator Circuit Short To Ground C1909 Ride Control RF Shock Actuator Circuit Failure