P1566: Load Signal From A/C Compressor Range Performance

VOLKSWAGEN LEXUS FORD LINCOLN MERCURY OTHER JAGUAR BUICK

Severity

Medium

System

Manufacturer-Specific Powertrain

Last reviewed: Jan 1, 0001 Last updated: Jan 1, 0001

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 P1566 Mean?

P1566 is a manufacturer-specific diagnostic trouble code: Load Signal From A/C Compressor Range Performance. This code applies to VOLKSWAGEN, LEXUS, FORD, LINCOLN, MERCURY vehicles. Unlike generic OBD-II codes, manufacturer-specific codes are defined by the vehicle maker and may only apply to certain makes and models.

Symptoms of P1566

⚠️ Check Engine Light (MIL) illuminated
⚠️ Load Signal From A/C Compressor Range not operating within expected parameters
⚠️ Reduced efficiency or performance of related system
⚠️ Reduced engine performance

Common Causes

🔍 Load Signal From A/C Compressor Range degraded or contaminated
🔍 Mechanical wear or binding in Load Signal From A/C Compressor Range
🔍 Incorrect Load Signal From A/C Compressor Range installed (wrong part number)
🔍 Related system mechanical issue affecting Load Signal From A/C Compressor Range readings

Frequently Asked Questions

What does P1566 mean?

P1566 indicates: Load Signal From A/C Compressor Range Performance. The vehicle's computer has detected that the Load Signal From A/C Compressor Range is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P1566?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1566 for extended periods may cause additional problems.

How much does it cost to fix P1566?

Repair costs for P1566 typically range from $50 to $250, 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 and clean Load Signal From A/C Compressor Range
🔧 Replace degraded Load Signal From A/C Compressor Range
🔧 Check for related mechanical issues affecting readings

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.