What causes a P2086 code?

P2086 can be triggered by several issues — see the verified probable causes and step-by-step diagnostics shared by mechanics and owners on OBDIY.

Can I drive with a P2086 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P2086 active.

Follow the step-by-step diagnostic on this page, then read the verified fixes contributed by other Heavy Truck owners — the answer marked "Verified Cause" worked for the original poster.

OBD-II

P2086

Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 1 Sensor 2

What it means

The Engine Control Module (ECM) has detected a voltage signal from the Bank 1 Sensor 2 EGT sensor that is outside of the expected operating parameters. This sensor typically monitors the temperature after the Diesel Oxidation Catalyst (DOC) or before the Diesel Particulate Filter (DPF).