KNOWN FAULT · Porsche

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

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

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.

Sources from the original database

Anonymous answer, no personal data.

How much does it cost to repair this fault?

No verified estimate; ask the garage for a quote.

A rough figure from the original database, not an up-to-date quote.

How is it checked?

Ask the garage to read the PTM fault memory and, if those two codes appear together, to reprogram it before replacing drivetrain parts.

What are the symptoms?

Yellow message on the instrument cluster reporting an all-wheel drive system fault and that only rear-wheel drive is available.

Which cars and years does it affect?

Brands: Porsche
Engine / equipment: Porsche Cayenne (9YA/9YB) with the 8-speed automatic gearbox and all-wheel drive
Period mentioned: 2019–2026 (US model years)

Which fault codes appear?

Find garages near you and, before you say yes, check whether the quote is reasonable.

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