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P1660 fault code: what it means

P1660: A/T to engine (FI) data line failure. Shifting and engine control interaction degraded.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

  1. wiring between PCM and TCM
  2. PCM or TCM fault

P1660 by make

Honda

A/T to engine (FI) data line failure. Shifting and engine control interaction degraded.

Usual causes: wiring between PCM and TCM; PCM or TCM fault

Not sure what P1660 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.