P0046 fault code: what it means

P0046: Turbo boost control circuit is not performing as expected; actual boost control does not match the command.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

split or disconnected vacuum hose to the turbo actuator
faulty boost control solenoid
sticking variable-vane or wastegate linkage
faulty electronic turbo actuator

P0046 by make

Ford

Turbo boost control range/performance: the turbo actuator is not reaching the position it was told to. Common on high-km Ranger/Everest 3.2.

Usual causes: worn or failing electronic turbo actuator; sticking turbo vanes from soot build-up; actuator wiring

Land Rover

Turbo boost control solenoid/actuator circuit range or performance. On 2.7 TDV6 and TDV8 the electronic turbo actuator cannot reach the commanded position.

Usual causes: boost leak or split inlet pipe confusing the boost control; faulty electronic turbo actuator; incorrect or poor-quality MAF sensor; wiring/connector fault at actuator

What the repair usually costs

MAF (mass air flow) sensor replaceNZ$170–NZ$660 · A$160–A$600
Turbocharger replacement (petrol)NZ$1,710–NZ$4,560 · A$1,560–A$4,240
Intercooler or boost hose replacementNZ$250–NZ$1,780 · A$250–A$1,710

Not sure what P0046 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.