OBD Guide
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C1738

Left Front Height Control Solenoid Valve Circuit

C1738 is an OBD-II diagnostic trouble code meaning: Left Front Height Control Solenoid Valve Circuit. Common causes: solenoid control circuit open, short circuit in the circuit. Estimated repair cost: $56–167.

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

Symptoms

  • Uneven body height
  • Inability to adjust suspension height
  • Suspension fault indicator is on
  • Unstable behavior of the car on the road

Causes

  • Solenoid control circuit open
  • Short circuit in the circuit
  • Height adjustment solenoid malfunction
  • Wiring harness damage
  • Problems in the suspension control unit

How to Fix

  1. Check the integrity of the wiring harness and connectors
  2. Check solenoid resistance
  3. Check the presence of power and ground on the control circuit
  4. Check the operation of the suspension control unit
  5. If necessary, replace the solenoid or repair the wiring harness.

Related codes

C1735C1736C1737C1739

FAQ

What does the C1738 code mean?

C1738 is an OBD-II diagnostic trouble code that indicates: Left Front Height Control Solenoid Valve Circuit

What causes a C1738 error code?

The most common causes of C1738 include: Solenoid control circuit open; Short circuit in the circuit; Height adjustment solenoid malfunction; Wiring harness damage.

How do I fix a C1738 diagnostic trouble code?

To fix C1738: Check the integrity of the wiring harness and connectors. Check solenoid resistance. Check the presence of power and ground on the control circuit. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1738?

Limited driving only, diagnose soon

How much does it cost to fix C1738?

The estimated repair cost for C1738 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat