OBD Guide
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C15C8

Power Supply Relay Failure

C15C8 is an OBD-II diagnostic trouble code meaning: Power Supply Relay Failure. Common causes: relay overload, corrosion of relay contacts. Estimated repair cost: $22–56.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$22–56 (est.)

Symptoms

  • Unstable engine operation
  • Problems starting the engine
  • Failure of vehicle electronic systems

Causes

  • Relay overload
  • Corrosion of relay contacts
  • Mechanical wear of the relay
  • Wiring Harness Problems

How to Fix

  1. Check the condition of the power relay
  2. Check relay contacts for corrosion
  3. Replace relay if necessary
  4. Check wiring harness for damage

Related codes

P0560P0562P0563

FAQ

What does the C15C8 code mean?

C15C8 is an OBD-II diagnostic trouble code that indicates: Power Supply Relay Failure

What causes a C15C8 error code?

The most common causes of C15C8 include: Relay overload; Corrosion of relay contacts; Mechanical wear of the relay; Wiring Harness Problems.

How do I fix a C15C8 diagnostic trouble code?

To fix C15C8: Check the condition of the power relay. Check relay contacts for corrosion. Replace relay if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C15C8?

Limited driving only, diagnose soon

How much does it cost to fix C15C8?

The estimated repair cost for C15C8 is $22–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat