P0800 — Transfer Case Control System (MIL Request)

What Does P0800 Mean?

P0800 is a diagnostic trouble code indicating: Transfer Case Control System (MIL Request). This code relates to the transmission system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P0800

⚠️ Check Engine Light (MIL) illuminated
⚠️ Transfer Case Control System (MIL Request) not functioning as expected
⚠️ Related system may be in fail-safe mode
⚠️ Harsh or delayed shifting

Common Causes

🔍 Faulty Transfer Case Control System (MIL Request)
🔍 Wiring or connector issue in Transfer Case Control System (MIL Request) circuit
🔍 Related mechanical or electrical fault
🔍 ECM/PCM issue (rare)

Frequently Asked Questions

What does P0800 mean?

P0800 indicates: Transfer Case Control System (MIL Request). The vehicle's computer has detected that the Transfer Case Control System (MIL Request) is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P0800?

Only short distances if absolutely necessary. P0800 affects a critical system and should be diagnosed within a few days to avoid further damage.

How much does it cost to fix P0800?

Repair costs for P0800 typically range from $150 to $500, 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 Transfer Case Control System (MIL Request) and related wiring
🔧 Replace faulty Transfer Case Control System (MIL Request)

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.

P0800: Transfer Case Control System (MIL Request)