OBD Guide
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C1477

High Pressure Hydraulic Circuit Leakage Plausibility Failure

C1477 is an OBD-II diagnostic trouble code meaning: High Pressure Hydraulic Circuit Leakage Plausibility Failure. Common causes: hydraulic fluid leak, pressure sensor malfunction. Estimated repair cost: $56–278.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–278 (est.)

Symptoms

  • Fault indicator is on
  • Reduced braking performance
  • Unstable suspension operation (if associated with an adaptive system)

Causes

  • Hydraulic fluid leak
  • Pressure sensor malfunction
  • Wiring harness damage
  • Mechanical failure of the hydraulic pump
  • Problems with the control unit (rare)

How to Fix

  1. Check hydraulic fluid level
  2. Visually inspect the system for leaks
  3. Check pressure sensors and their connections
  4. Scan the system for additional errors
  5. Check the operation of the hydraulic pump

Related codes

C1476C1478C1480

FAQ

What does the C1477 code mean?

C1477 is an OBD-II diagnostic trouble code that indicates: High Pressure Hydraulic Circuit Leakage Plausibility Failure

What causes a C1477 error code?

The most common causes of C1477 include: Hydraulic fluid leak; Pressure sensor malfunction; Wiring harness damage; Mechanical failure of the hydraulic pump.

How do I fix a C1477 diagnostic trouble code?

To fix C1477: Check hydraulic fluid level. Visually inspect the system for leaks. Check pressure sensors and their connections. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1477?

Limited driving only, diagnose soon

How much does it cost to fix C1477?

The estimated repair cost for C1477 is $56–278. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat