KNOWN FAULTS · Porsche

Porsche Cayenne (9Y0) S 2.9 V6 / Turbo 4.0 V8 common problems.

2017–2026 · Petrol

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

6 known faults with sources

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.

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.

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.

Applies if: US bulletin (162/26) for the Cayenne S, GTS and Turbo E-Hybrid with the 4.0 V8 from model year 2024; in Europe, ask the dealer.

"Coolant too low" message and traces on the water pump: a little is normal (Cayenne and Panamera V8 from 2024)Cooling

Engine / equipment: Porsche Cayenne and Panamera with the 4.0 twin-turbo V8 (S, GTS and Turbo E-Hybrid)
Period mentioned: 2024–2026 (US model years)
Symptoms: The "Coolant too low" message appears or coolant loss is seen, and the workshop finds small traces in the leakage chamber of the water pump.
Possible cause described: The water pump lip seal is lubricated by coolant and can let out up to 3 ml every 100 operating hours: that is normal and not grounds for complaint. The level can also drop after insufficient bleeding or a previous repair. Porsche explains it in its technical information 162/26.
Check for the garage: Ask them to check the whole circuit for leaks, confirm the bleeding was done properly and document the leak point with photos before replacing the pump.
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.

Applies if: US bulletin (477/26) for the Cayenne from model year 2024 with PCCB front brakes; in Europe, ask the dealer.

Squealing ceramic front brakes (PCCB) when braking (Cayenne from 2024)Brakes

Engine / equipment: Porsche Cayenne (9YA/9YB) with PCCB ceramic front brakes
Period mentioned: 2024–2026 (US model years)
Symptoms: The front brakes squeal when braking at different speeds.
Possible cause described: The modified suspension design compared with the previous Cayenne can create natural frequencies that cause the noise (about 610 Hz). Porsche replaces the front calipers and pads with an improved version, fitted in production from 23/6/2026 (technical information 477/26).
Check for the garage: Ask the workshop to compare the noise with the Porsche sound file; only if it matches are the calipers and pads replaced according to information 477/26.
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.

Applies if: US bulletin (SY 80/26) for the Cayenne from model year 2024 with the large panoramic roof; in Europe, ask the dealer.

Squeaks or creaks from the panoramic roof area (Cayenne from 2024)Bodywork

Engine / equipment: Porsche Cayenne (9YA/9YB) with the large panoramic roof
Period mentioned: 2024–2026 (US model years)
Symptoms: Squeaks or creaks from the panoramic roof area when using it or while driving.
Possible cause described: The rubber parts of the roof module dry out or the roof trim panel clips move. Porsche fixes it by lubricating the roof seals and adding felt to the trim panel clips (workshop manual SY 80/26).
Check for the garage: Ask the workshop to rework the roof and the trim panel according to SY 80/26.
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.