U0286 — Lost Communication With Radiator Anti Tamper Device

What Does U0286 Mean?

U0286 is a diagnostic trouble code indicating: Lost Communication With Radiator Anti Tamper Device. This code relates to the manufacturer-specific network system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of U0286

⚠️ Check Engine Light (MIL) illuminated
⚠️ No communication with Radiator Anti Tamper Device
⚠️ Multiple warning lights may illuminate simultaneously
⚠️ Related system completely inoperative
⚠️ Multiple warning lights on dashboard

Common Causes

🔍 CAN bus wiring fault (open or shorted) to Radiator Anti Tamper Device
🔍 Power or ground supply issue to Radiator Anti Tamper Device
🔍 Radiator Anti Tamper Device internal failure
🔍 Water intrusion damaging module or connectors
🔍 CAN bus termination resistor fault

Frequently Asked Questions

What does U0286 mean?

U0286 indicates: Lost Communication With Radiator Anti Tamper Device. The vehicle's computer has detected that the Radiator Anti Tamper Device is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code U0286?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with U0286 for extended periods may cause additional problems.

How much does it cost to fix U0286?

Repair costs for U0286 typically range from $80 to $1200, 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 CAN bus wiring to Radiator Anti Tamper Device for damage
🔧 Check power and ground supply to Radiator Anti Tamper Device
🔧 Replace failed Radiator Anti Tamper Device

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.

U0286: Lost Communication With Radiator Anti Tamper Device