P1702 fault code: what it means

P1702: Transfer box signal line communication error.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

wiring fault
transfer box module fault

P1702 by make

Land Rover

Transfer box signal line communication error.

Usual causes: wiring fault; transfer box module fault

Suzuki

TCM memory checksum error. TCM may need reprogramming or replacement.

Usual causes: TCM internal fault

What the repair usually costs

Transfer case oil changeNZ$80–NZ$200 · A$90–A$200

Not sure what P1702 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.