OBD Guide
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C1790

Air Suspension Left Rear Air Spring/Shock Solenoid Output Circuit Failure

C1790 is an OBD-II diagnostic trouble code meaning: Air Suspension Left Rear Air Spring/Shock Solenoid Output Circuit Failure. Common causes: open or short circuit in wiring harness, air suspension solenoid malfunction. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Uneven suspension performance
  • The car may tilt to one side
  • Suspension fault indicator lights up
  • Reduced riding comfort

Causes

  • Open or short circuit in wiring harness
  • Air suspension solenoid malfunction
  • Problems with the suspension control unit
  • Contact corrosion

How to Fix

  1. Check the integrity of the wiring harness to the solenoid
  2. Check solenoid resistance
  3. Inspect contacts for corrosion
  4. Replace solenoid or wiring harness if necessary
  5. Reset the error and check the system operation

Related codes

C1791C1792C1793

FAQ

What does the C1790 code mean?

C1790 is an OBD-II diagnostic trouble code that indicates: Air Suspension Left Rear Air Spring/Shock Solenoid Output Circuit Failure

What causes a C1790 error code?

The most common causes of C1790 include: Open or short circuit in wiring harness; Air suspension solenoid malfunction; Problems with the suspension control unit; Contact corrosion.

How do I fix a C1790 diagnostic trouble code?

To fix C1790: Check the integrity of the wiring harness to the solenoid. Check solenoid resistance. Inspect contacts for corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1790?

Limited driving only, diagnose soon

How much does it cost to fix C1790?

The estimated repair cost for C1790 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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