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P0791
System
Powertrain (Transmission)
Benötigter Scanner
Full-system scanner (engine, ABS, SRS, transmission, service resets)

Intermediate Shaft Speed Sensor Circuit Malfunction

Understand P0791, common causes, and the right TOPDON scanner to diagnose it.

Intermediate shaft speed sensor circuit fault on multi-shaft automatics.

Häufige Symptome

  • Harsh shifts
  • Trans limp
  • Incorrect ratio codes

Typische Ursachen

  • Failed ISS sensor
  • Wiring in transmission
  • Internal tone ring damage

Welchen Scanner brauchen Sie?

Full-system scanner (engine, ABS, SRS, transmission, service resets)

Nutzen Sie Live-Daten und Freeze Frame, bevor Sie Teile tauschen. ABS-, SRS- und U-Codes erfordern meist einen Vollsystem-Scanner.

Diagnose-Tipps

  • Freeze Frame erfassen, wenn der Code erstmals gesetzt wird
  • Code erst nach Behebung der Ursache löschen
  • Auf verwandte pending codes prüfen
  • Batteriespannung über 12,4 V prüfen, bevor Sie Sensoren verdächtigen

Empfohlene TOPDON Scanner

Häufig gestellte Fragen

What does P0791 mean?
P0791 indicates intermediate shaft speed sensor circuit malfunction. Intermediate shaft speed sensor circuit fault on multi-shaft automatics.
Can I diagnose P0791 with a basic code reader?
P0791 may set in the engine module, but related diagnostics often benefit from an enhanced or full-system scanner with live data and freeze frame.
Which TOPDON scanner do I need for P0791?
Full-system scanner (engine, ABS, SRS, transmission, service resets) See recommended tools on this page.
Is it safe to drive with P0791?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.