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P0791-M
Output speed sensor circuit malfunction (MANUAL transmission - same numeric code P0791, monitored by ECM)
Output speed sensor circuit malfunction (MANUAL transmission - same numeric code P0791, monitored by ECM)
Applies to: 2.1 / 2.5 / 3.0 V6 petrol (AJ-V6), 2001-2009 · MIL trips: N · Warning: None · Default action: None · Drive cycle: Drive vehicle above 16 km/h (10 mph) for 15s · Pin: EN16-026 · Confidence: Official - Jaguar published data
Common causes
- Output speed sensor power supply circuit: open circuit, short circuit
- Transmission to ECM output speed sensor circuits: open circuit, short circuit, high resistance
- Output speed sensor failure
Quick checks
- Scan access: JAG (WDS/IDS only)
- Reproduce: Drive vehicle above 16 km/h (10 mph) for 15s
- Prefer official/field-verified path before guessing sensors
Typical fixes
- On manual cars this sensor reports to the ECM, not a TCM
- Check supply and signal wiring
- Replace the gearbox output/vehicle speed sensor