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P05F6: Exhaust Aftertreatment Power Relay Control Circuit Stuck On

Severity
High
System
Vehicle Speed and Idle Control
Last reviewed: Last updated:

Methodology: We combine code standards with complaint and reliability patterns, then review for clear, vehicle-first diagnosis steps.

Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).

Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.

What Does P05F6 Mean?

P05F6 is a diagnostic trouble code indicating: Exhaust Aftertreatment Power Relay Control Circuit Stuck On. This code relates to the vehicle speed and idle control system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P05F6

Common Causes

Frequently Asked Questions

What does P05F6 mean?
P05F6 indicates: Exhaust Aftertreatment Power Relay Control Circuit Stuck On. The vehicle's computer has detected that the Exhaust Aftertreatment Power Relay is not operating within its expected parameters and stored this diagnostic trouble code.
Can I drive with code P05F6?
Only short distances if absolutely necessary. P05F6 affects a critical system and should be diagnosed within a few days to avoid further damage.
How much does it cost to fix P05F6?
Repair costs for P05F6 typically range from $50 to $300, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

  • 🔧 Inspect Exhaust Aftertreatment Power Relay for mechanical binding or debris
  • 🔧 Replace stuck Exhaust Aftertreatment Power Relay
  • 🔧 Check Exhaust Aftertreatment Power Relay control circuit for short
  1. 1
    Find your vehicle above

    Click your make and model for real owner reports and common causes specific to your vehicle.

  2. 2
    Check for recalls

    Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.

  3. 3
    Get a professional diagnosis

    A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

Related Codes

P0500 Vehicle Speed Sensor A Circuit P0501 Vehicle Speed Sensor A Circuit Range/Performance P0502 Vehicle Speed Sensor A Circuit Low P0503 Vehicle Speed Sensor Circuit Intermittent/High P0504 Brake Switch A/B Correlation P0505 Idle Control System P0506 Idle Control System RPM - Lower Than Expected P0507 Idle Control System RPM - Higher Than Expected P0508 Idle Air Control Circuit Low P0509 Idle Air Control Circuit High