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P1600 fault code: what it means

P1600: Serial communication problem between ECM and TCM. Automatic shifting may go into fail-safe.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

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

P1600 by make

Suzuki

Serial communication problem between ECM and TCM. Automatic shifting may go into fail-safe.

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

Not sure what P1600 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.