P0606 fault code: what it means

P0606: Engine computer (ECM/PCM) processor has failed its self-test. Can cause stalling or limp mode.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

poor power or earth to the ECM
weak battery or charging fault
water in the ECM
internal ECM failure

P0606 by make

Haval

ECU internal processor fault.

Usual causes: faulty ECU; poor ECU power or earth; needs software update

Isuzu

ECM internal processor fault.

Usual causes: faulty ECM; poor ECM power or earth; needs reprogramming

Kia

Engine computer (ECM) processor self-test failed.

Usual causes: ECM internal fault; ECM software needing update; ECM power or earth supply fault

What the repair usually costs

Automatic transmission rebuild, 6-speed and up (sent to specialist)NZ$7,190–NZ$13,080 · A$6,190–A$11,830
DSG / dual-clutch mechatronic unit replacement (new or reman)NZ$4,300–NZ$7,160 · A$3,750–A$6,390
DSG mechatronic repair / rebuild (unit sent to specialist)NZ$2,070–NZ$4,800 · A$1,890–A$4,250
12 V battery replace, standard flooded (small / medium car)NZ$190–NZ$330 · A$170–A$310

Not sure what P0606 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.