OBD Guide
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C2778

Sensor Power Supply Failure

C2778 is an OBD-II diagnostic trouble code meaning: Sensor Power Supply Failure. Common causes: broken or damaged wiring harness, poor contact in sensor connectors. Estimated repair cost: $11–56.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$11–56 (est.)

Symptoms

  • Unstable engine operation
  • Check Engine light comes on
  • Reduced engine power
  • Increased fuel consumption

Causes

  • Broken or damaged wiring harness
  • Poor contact in sensor connectors
  • Sensor malfunction
  • Relay or fuse problems

How to Fix

  1. Check wiring harness for damage
  2. Inspect the sensor connectors and clean the contacts
  3. Check fuses and relays
  4. Replace the faulty sensor if necessary

Related codes

P0100P0110P0120

FAQ

What does the C2778 code mean?

C2778 is an OBD-II diagnostic trouble code that indicates: Sensor Power Supply Failure

What causes a C2778 error code?

The most common causes of C2778 include: Broken or damaged wiring harness; Poor contact in sensor connectors; Sensor malfunction; Relay or fuse problems.

How do I fix a C2778 diagnostic trouble code?

To fix C2778: Check wiring harness for damage. Inspect the sensor connectors and clean the contacts. Check fuses and relays. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C2778?

Limited driving only, diagnose soon

How much does it cost to fix C2778?

The estimated repair cost for C2778 is $11–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat