KNOWN FAULTS · Porsche

Known faults for the Porsche Cayenne (9Y0).

2017–2026 · Petrol / Plug-in hybrid

Sources are not verified in real time and no entry confirms that your car is affected.

3 known faults with sources

Engines: 3.0 V6 (Petrol) · S 2.9 V6 / Turbo 4.0 V8 (Petrol) · E-Hybrid (Plug-in hybrid)

Applies if: Third-generation Cayenne; confirm by VIN which campaigns apply.

Fuel in the charcoal canister and other campaigns on the Cayenne IIIFuel system

Engine / equipment: Porsche Cayenne III (9Y0)
Period mentioned: 2017 onwards
Symptoms: Engine misfires or backfires in the intake after refuelling; a leak from a quick connector in the fuel line; a rear centre seat belt that does not restrain properly.
Possible cause described: Documented recalls: on 2018 cars, fuel could reach the charcoal canister through the vent line if the nozzle is inserted at an angle or not fully, creating a flammable mixture in the intake (filler pipe and canister are replaced); a leaking quick connector on the fuel line; the rear centre buckle on cars built from 14/9/2017 to 8/3/2018. The German guide does not yet have reliable fault data for this generation.
Check for the garage: Check the recalls by VIN; insert the nozzle straight and fully when refuelling.
Cost cited in the source: No verified estimate; ask the garage for a quote.A rough figure from the original database, not an up-to-date quote.

Engines: 3.0 V6 (Petrol) · S 2.9 V6 / Turbo 4.0 V8 (Petrol) · E-Hybrid (Plug-in hybrid)

Applies if: US bulletin (Technical Information 381/26) for the Cayenne 9YA/9YB with the 8-speed automatic gearbox and all-wheel drive (G1G).

"All-wheel drive system malfunction" message and rear-wheel drive only, caused by the PTM control unit software (Cayenne 9Y)Transmission

Engine / equipment: Porsche Cayenne (9YA/9YB) with the 8-speed automatic gearbox and all-wheel drive
Period mentioned: 2019–2026 (US model years)
Symptoms: Yellow message on the instrument cluster reporting an all-wheel drive system fault and that only rear-wheel drive is available.
Possible cause described: The all-wheel drive control unit (PTM) stores codes C12BEF6 (internal control unit monitoring) and C133700 (forced PSM activation) at the same time; Porsche fixes it by reprogramming the PTM control unit (Technical Information 381/26).
Check for the garage: Ask the garage to read the PTM fault memory and, if those two codes appear together, to reprogram it before replacing drivetrain parts.
Cost cited in the source: No verified estimate; ask the garage for a quote.A rough figure from the original database, not an up-to-date quote.

Engines: 3.0 V6 (Petrol) · S 2.9 V6 / Turbo 4.0 V8 (Petrol) · E-Hybrid (Plug-in hybrid)

Applies if: US bulletin (Technical Information 168/18) for the 2018–2019 Cayenne 9YA with an LG 12 V battery.

Flat battery and "Battery low, service necessary" message caused by the battery sensor software (Cayenne 2018–2019)Electrical and electronic systems

Engine / equipment: Porsche Cayenne (9YA) with an LG 12 V battery
Period mentioned: 2018–2019
Symptoms: The 12 V battery runs flat and the yellow battery low message appears on the instrument cluster.
Possible cause described: A battery sensor with software older than version 1000 can, together with other factors, cause a high standby current (over 1 A) after charging. Porsche says to reprogram it from the gateway control unit (Technical Information 168/18).
Check for the garage: Before replacing the battery, ask the garage to check the battery sensor software level in the gateway control unit and, if it is below 1000, to reprogram it.
Cost cited in the source: No verified estimate; ask the garage for a quote.A rough figure from the original database, not an up-to-date quote.