OBD Guide
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C1918

Air Suspension Ride Height Select Switch Circuit Failure

C1918 is an OBD-II diagnostic trouble code meaning: Air Suspension Ride Height Select Switch Circuit Failure. Common causes: ride height select switch failure, open or short circuit in switch wiring. Estimated repair cost: $33–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$33–167 (est.)

Symptoms

  • The suspension fault light on the dashboard is on
  • Cannot change ride height using switch
  • Air suspension fixed in one position
  • Air suspension compressor does not respond to switch presses
  • Possible spontaneous changes in body height when driving

Causes

  • Ride Height Select Switch Failure
  • Open or short circuit in switch wiring
  • Oxidation or damage to the switch connector
  • Air suspension control unit malfunction
  • Moisture in the switch control circuit

How to Fix

  1. Read all fault codes with a scanner and record the data
  2. Check air suspension circuit fuses
  3. Inspect the switch and its connector for oxidation or damage.
  4. Measure the supply voltage and signal levels at the switch contacts
  5. Check the integrity of the wiring from the switch to the suspension control unit
  6. If the switch is confirmed to be faulty, replace it and reset the codes

Related codes

C1917C1919C1920C1921

FAQ

What does the C1918 code mean?

C1918 is an OBD-II diagnostic trouble code that indicates: Air Suspension Ride Height Select Switch Circuit Failure

What causes a C1918 error code?

The most common causes of C1918 include: Ride Height Select Switch Failure; Open or short circuit in switch wiring; Oxidation or damage to the switch connector; Air suspension control unit malfunction.

How do I fix a C1918 diagnostic trouble code?

To fix C1918: Read all fault codes with a scanner and record the data. Check air suspension circuit fuses. Inspect the switch and its connector for oxidation or damage.. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1918?

Limited driving only, diagnose soon

How much does it cost to fix C1918?

The estimated repair cost for C1918 is $33–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat