OBD Guide
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C1645

Power Steering Control System Failure

C1645 is an OBD-II diagnostic trouble code meaning: Power Steering Control System Failure. Common causes: malfunction of the power steering control module, damaged wiring harness or contacts. Estimated repair cost: $167–556.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$167–556 (est.)

Symptoms

  • Increased effort when turning the steering wheel
  • The warning light on the dashboard is on
  • Intermittent operation of the power steering
  • Uneven steering effort

Causes

  • Malfunction of the power steering control module
  • Damaged wiring harness or contacts
  • Problems with module power supply (blown fuse, poor contact)
  • Malfunction of the torque sensor (for electric power steering)
  • Sticking or broken pressure control solenoid (for power steering)
  • Low power steering fluid level (for hydraulic systems)

How to Fix

  1. Check and replace the amplifier control circuit fuse if necessary.
  2. Visually inspect the wiring harness and connectors for damage.
  3. Check the level and condition of power steering fluid (for hydraulic systems)
  4. Read system operating parameters through a diagnostic scanner
  5. If necessary, replace the control module or sensors
  6. Check the operation of the pressure control solenoids (for power steering)

Related codes

C1640C1643C1648

FAQ

What does the C1645 code mean?

C1645 is an OBD-II diagnostic trouble code that indicates: Power Steering Control System Failure

What causes a C1645 error code?

The most common causes of C1645 include: Malfunction of the power steering control module; Damaged wiring harness or contacts; Problems with module power supply (blown fuse, poor contact); Malfunction of the torque sensor (for electric power steering).

How do I fix a C1645 diagnostic trouble code?

To fix C1645: Check and replace the amplifier control circuit fuse if necessary.. Visually inspect the wiring harness and connectors for damage.. Check the level and condition of power steering fluid (for hydraulic systems). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1645?

Limited driving only, diagnose soon

How much does it cost to fix C1645?

The estimated repair cost for C1645 is $167–556. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat