OBD Guide
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C1851

Air Suspension Warning Lamp Circuit Open

C1851 is an OBD-II diagnostic trouble code meaning: Air Suspension Warning Lamp Circuit Open. Common causes: broken or damaged wiring harness, warning light fault. Estimated repair cost: $56–222.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–222 (est.)

Symptoms

  • Air suspension warning light does not light up
  • Suspension malfunction
  • Error message on the dashboard

Causes

  • Broken or damaged wiring harness
  • Warning light fault
  • Problems with the suspension control module
  • Contact corrosion

How to Fix

  1. Check the integrity of the wiring harness
  2. Check the serviceability of the warning lamp
  3. Diagnose the suspension control module
  4. Check contacts for corrosion

Related codes

C1850C1852

FAQ

What does the C1851 code mean?

C1851 is an OBD-II diagnostic trouble code that indicates: Air Suspension Warning Lamp Circuit Open

What causes a C1851 error code?

The most common causes of C1851 include: Broken or damaged wiring harness; Warning light fault; Problems with the suspension control module; Contact corrosion.

How do I fix a C1851 diagnostic trouble code?

To fix C1851: Check the integrity of the wiring harness. Check the serviceability of the warning lamp. Diagnose the suspension control module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1851?

Limited driving only, diagnose soon

How much does it cost to fix C1851?

The estimated repair cost for C1851 is $56–222. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat