P1620 fault code: what it means

P1620: Map cooling thermostat control circuit signal high.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

faulty map thermostat
wiring fault

P1620 by make

BMW

Map cooling thermostat control circuit signal high.

Usual causes: faulty map thermostat; wiring fault

Mini

Map cooling thermostat control circuit signal high.

Usual causes: faulty map thermostat; wiring fault

Volvo

Check engine light requested by the throttle unit. Read throttle codes; usually the throttle body.

Usual causes: electronic throttle unit fault

What the repair usually costs

Electronic throttle body replaceNZ$470–NZ$1,290 · A$440–A$1,190

Not sure what P1620 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.