C15D9 fault code: what it means

C15D9: Quadra-Lift low air mass (Grand Cherokee). System is short of air, usually from a leak; FCA asks for air-mass and leak-down tests first.

Chassis (brakes, steering, suspension) · Costly if missed

Usual causes, most likely first

air spring or line leak
valve block leak
compressor weak

C15D9 by make

Jeep

Quadra-Lift low air mass (Grand Cherokee). System is short of air, usually from a leak; FCA asks for air-mass and leak-down tests first.

Usual causes: air spring or line leak; valve block leak; compressor weak

What the repair usually costs

Air suspension strut / air spring, each (Range Rover, Mercedes, Audi)NZ$930–NZ$3,580 · A$850–A$3,210

Not sure what C15D9 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.