U0286 Lost Communication With Radiator Anti-Tamper Device

Some low-emission vehicles carry a catalytic radiator coating that breaks down ground-level ozone; BASF sells it as PremAir, and EPA and CARB grant 5 mg/mi credit for it. CARB requires the OBD system to watch such a direct ozone reduction system. A Ford patent shows how: a unit whose pins are pushed between the radiator fins sends the ECU a temperature value, relevant because the coating only works from roughly 60 °C, together with an encrypted identity, and a breakable pin stops it being moved to a cheaper uncoated radiator. U0286 means the engine controller no longer hears this device, so it can neither confirm the coated radiator nor track its temperature. No manufacturer documents U0286 in a publicly accessible service text. Cooling itself is unaffected; the MIL can light.

Likely causes

Symptoms

• Malfunction indicator lamp on
• Further codes for the ozone reduction system or radiator temperature

Repair estimate

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

Related codes

References: data.epo.org, law.cornell.edu, automotive-transportation.basf.com.