P17F1 on Infiniti
Transmission Gear Engagement Failure
P17F1 on Infiniti vehicles indicates transmission gear engagement failure. Au7o has documented this code across 1 Infiniti model — most commonly on QX55. This transmission code sets when the control module determines that the transmission failed to properly engage a commanded gear or clutch, meaning the requested gear was not achieved or could not be confirmed. The computer monitors input and output speeds and clutch/solenoid feedback, and when the expected engagement doesn't happen it flags this fault, often putting the transmission into a protective fail-safe mode. It can cause slipping, no drive, harsh engagement, or failure to move in certain gears. On some CVT-equipped vehicles this code appears after valve body or transmission replacement when the unit's calibration data has not been properly loaded. Typical repair costs on Infiniti range from $200 to $8,000, depending on the specific model and root cause.
Common Causes of P17F1
- •Low or contaminated transmission fluid
- •Worn or failing internal clutches or bands
- •Faulty shift solenoid or pressure control solenoid
- •Valve body wear, sticking, or hydraulic leakage
- •Missing or incorrect calibration data after valve body/transmission service
- •Internal mechanical wear or damage in the transmission
- •Wiring or connector fault in the transmission control circuit
- •Faulty transmission control module
P17F1 on Infiniti by Model
Infiniti QX55(1 issue)
- CVT (Jatco Xtronic) Shudder, Hesitation and Overheating2022-2024
The QX55 pairs the torque-rich VC-Turbo engine with a Jatco Xtronic CVT. Owners and technicians report the classic Nissan/Infiniti CVT complaints: a rubber-band or 'revving' feel where engine RPM flares without corresponding acceleration, low-speed judder/shudder while slowing to a stop, hesitation and turbo lag off the line, and overheating under sustained load. CVTs are sensitive to the engine's low-end torque, and heat plus fluid breakdown accelerate internal wear. Judder trouble codes such as P17F0/P17F1 are associated with the family.
Looking for P17F1 on a different make?
View P17F1 across all makes →Frequently Asked Questions
What does P17F1 mean on Infiniti?▼
P17F1 stands for "Transmission Gear Engagement Failure." This transmission code sets when the control module determines that the transmission failed to properly engage a commanded gear or clutch, meaning the requested gear was not achieved or could not be confirmed. The computer monitors input and output speeds and clutch/solenoid feedback, and when the expected engagement doesn't happen it flags this fault, often putting the transmission into a protective fail-safe mode. It can cause slipping, no drive, harsh engagement, or failure to move in certain gears. On some CVT-equipped vehicles this code appears after valve body or transmission replacement when the unit's calibration data has not been properly loaded. On Infiniti specifically, this code is documented across 1 model.
What causes P17F1 on Infiniti vehicles?▼
Common causes on Infiniti: Low or contaminated transmission fluid, Worn or failing internal clutches or bands, Faulty shift solenoid or pressure control solenoid, Valve body wear, sticking, or hydraulic leakage, Missing or incorrect calibration data after valve body/transmission service. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P17F1 on a Infiniti?▼
Repair costs on Infiniti range from $200 to $8,000, depending on the specific model and root cause.
Which Infiniti models have P17F1 documented?▼
Au7o has documented P17F1 on 1 Infiniti model: QX55.