P1635 fault code: what it means

P1635: IMA battery condition monitor (BCM) module problem. Battery state cannot be read; IMA disabled.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

battery condition monitor module
IMA battery fault

P1635 by make

Honda

IMA battery condition monitor (BCM) module problem. Battery state cannot be read; IMA disabled.

Usual causes: battery condition monitor module; IMA battery fault

What the repair usually costs

EV battery pack replace (Tesla / Kona / Ioniq / MG / BYD, genuine)NZ$22,110–NZ$47,100 · A$21,240–A$45,230

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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.