P1603 fault code: what it means

P1603: Engine stall history (Lexus): the engine stalled at some point and the ECM logged it.

Engine and gearbox (powertrain) · Keep an eye on

Usual causes, most likely first

fuel delivery fault
dirty throttle body or idle problem
weak battery or poor earths

P1603 by make

Lexus

Engine stall history (Lexus): the engine stalled at some point and the ECM logged it.

Usual causes: fuel delivery fault; dirty throttle body or idle problem; weak battery or poor earths

Suzuki

TCM has trouble codes stored: read the transmission codes.

Usual causes: transmission fault codes in the TCM

Toyota

Engine stall history (Toyota): the engine has stalled at some point and the ECM has logged it. Check other codes and freeze frame for the cause.

Usual causes: fuel delivery fault (pump, filter); dirty throttle body or idle problem; weak battery or poor earths

What the repair usually costs

CVT / e-CVT replacement with remanufactured unit (hybrid SUV)NZ$9,450–NZ$12,590 · A$9,170–A$12,540
12 V battery replace, standard flooded (small / medium car)NZ$190–NZ$330 · A$170–A$310
12 V battery replace, standard flooded (SUV / ute / 4WD)NZ$290–NZ$500 · A$270–A$460
Throttle body clean and idle relearnNZ$90–NZ$190 · A$100–A$200

Not sure what P1603 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.