P27A0 — Four Wheel Drive (4WD) Range Signal Circuit High

What Does P27A0 Mean?

P27A0 is a diagnostic trouble code indicating: Four Wheel Drive (4WD) Range Signal Circuit High. This code relates to the powertrain system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P27A0

⚠️ Check Engine Light (MIL) illuminated
⚠️ Four Wheel Drive (4WD) Range Signal reading stuck at maximum value
⚠️ Related system operating erratically or in default mode
⚠️ Reduced engine performance

Common Causes

🔍 Short to voltage in Four Wheel Drive (4WD) Range Signal wiring harness
🔍 Corroded or water-damaged Four Wheel Drive (4WD) Range Signal connector
🔍 Faulty Four Wheel Drive (4WD) Range Signal outputting maximum voltage
🔍 Damaged wiring rubbing against metal components
🔍 ECM/PCM internal fault (rare)

Frequently Asked Questions

What does P27A0 mean?

P27A0 indicates: Four Wheel Drive (4WD) Range Signal Circuit High. The vehicle's computer has detected that the Four Wheel Drive (4WD) Range Signal is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P27A0?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P27A0 for extended periods may cause additional problems.

How much does it cost to fix P27A0?

Repair costs for P27A0 typically range from $20 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 and repair Four Wheel Drive (4WD) Range Signal wiring for short to voltage
🔧 Clean or replace corroded Four Wheel Drive (4WD) Range Signal connector
🔧 Replace faulty Four Wheel Drive (4WD) Range Signal

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.

P27A0: Four Wheel Drive (4WD) Range Signal Circuit High