P279D — Four Wheel Drive (4WD) Range Signal Circuit

What Does P279D Mean?

P279D is a diagnostic trouble code indicating: Four Wheel Drive (4WD) Range Signal Circuit. This code relates to the powertrain system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P279D

⚠️ Check Engine Light (MIL) illuminated
⚠️ Erratic Four Wheel Drive (4WD) Range Signal readings
⚠️ Related system operating intermittently
⚠️ Reduced engine performance

Common Causes

🔍 Wiring issue in Four Wheel Drive (4WD) Range Signal circuit (damaged, chafed, or corroded)
🔍 Faulty Four Wheel Drive (4WD) Range Signal connector or terminal
🔍 Failed Four Wheel Drive (4WD) Range Signal
🔍 ECM/PCM connection issue

Frequently Asked Questions

What does P279D mean?

P279D indicates: Four Wheel Drive (4WD) Range Signal Circuit. 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 P279D?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P279D for extended periods may cause additional problems.

How much does it cost to fix P279D?

Repair costs for P279D typically range from $80 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 and connectors
🔧 Replace faulty 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.

P279D: Four Wheel Drive (4WD) Range Signal Circuit