P279F — Four Wheel Drive (4WD) Range Signal Circuit Low

What Does P279F Mean?

P279F is a diagnostic trouble code indicating: Four Wheel Drive (4WD) Range Signal Circuit Low. This code relates to the powertrain system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P279F

⚠️ Check Engine Light (MIL) illuminated
⚠️ Four Wheel Drive (4WD) Range Signal reading at zero or minimum value
⚠️ Related system not functioning or in fail-safe mode
⚠️ Reduced engine performance

Common Causes

🔍 Open or broken wire in Four Wheel Drive (4WD) Range Signal circuit
🔍 Poor ground connection at Four Wheel Drive (4WD) Range Signal
🔍 Faulty Four Wheel Drive (4WD) Range Signal with no output signal
🔍 Disconnected or loose Four Wheel Drive (4WD) Range Signal connector
🔍 Blown fuse in related circuit

Frequently Asked Questions

What does P279F mean?

P279F indicates: Four Wheel Drive (4WD) Range Signal Circuit Low. 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 P279F?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P279F for extended periods may cause additional problems.

How much does it cost to fix P279F?

Repair costs for P279F 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

🔧 Repair broken wire or restore ground in Four Wheel Drive (4WD) Range Signal circuit
🔧 Clean and secure Four Wheel Drive (4WD) Range Signal connector and ground points
🔧 Replace failed Four Wheel Drive (4WD) Range Signal

1
Find your vehicle above
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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.

P279F: Four Wheel Drive (4WD) Range Signal Circuit Low