P1108 Barometric Pressure Circuit High Input

What does P1108 mean on a Honda?

P1108 — Barometric Pressure Circuit High Input. This Honda-enhanced code applies to Civic, Accord, CR-V, Pilot, Odyssey.

Common causes of P1108

• Open signal wire driving the BARO reading high
• Failed BARO/MAP sensor stuck at high voltage
• Poor ground connection at the sensor or ECM
• Short to reference voltage in the signal circuit

How to fix P1108

1. Read BARO data on an HDS scan tool at key-on engine-off
2. Backprobe signal, reference, and ground at the sensor connector
3. Repair open or shorted wiring and clean ground terminals
4. Replace the sensor only if voltage stays high with a proven-good circuit
5. Clear codes and confirm BARO tracks local weather-station pressure