P1601 — Electronic Throttle System fault — throttle motor / internal (Volvo 5-cyl ETM cluster)

What P1601 means

This is a manufacturer-specific code — its meaning depends on the vehicle’s make (see below).

What P1601 means on specific makes

Volvo CAUTION

Volvo throttle-unit internal fault. Part of the ETM-failure cluster on 5-cylinder Volvos; the throttle body's internal electronics report a bad signal. As with all Volvo P1xxx, the precise number maps to a native ECM-91xx code and varies by year.

1. Electronic Throttle Module internal failure ($200-500 / reman ~$150)
2. Throttle position sensor element worn
3. Wiring/connector
4. Carbon on throttle plate

Check first: Pull native Volvo codes; the ETM is the usual culprit on these years. Cleaning may help temporarily.

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