P0866 — TCM Communication Circuit High

Powertrain (engine/transmission)

TCM Communication Circuit High

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Can I drive with P0866?

You can usually drive home and book an inspection within a few days.

Frequently asked questions

What does fault code P0866 mean?

P0866 means TCM Communication Circuit High.

Can I keep driving with P0866?

You can usually drive home and book an inspection within a few days.

Related fault codes

• P0860 — Gear Shift Module Communication Circuit
• P0861 — Gear Shift Module Communication Circuit Low
• P0862 — Gear Shift Module Communication Circuit High
• P0863 — TCM Communication Circuit
• P0864 — TCM Communication Circuit Range/Performance
• P0865 — TCM Communication Circuit Low
• P0867 — Transmission Fluid Pressure Sensor
• P0868 — Transmission Fluid Pressure Low
• P0869 — Transmission Fluid Pressure High

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