The ECU decides when to command the gear change based on a number of sensor inputs, which includes data flowing from the intermediate shaft speed sensor labeled B. If there is an issue with the data coming from the ISS sensor, a P2745 DTC will be saved.
What Transmission Do I Have?
How Serious is the Code?
The P2745 diagnostic trouble code is bad, but not necessarily severe. You will experience a number of drivability problems, as it should be seen about as soon as possible.
Symptoms
Symptoms of a P2745 include:
- Delayed, harsh or erratic shifts
- Transmission not able to shift gears
- Limp Mode
- Speedometer failure
- Engine misfire
- Hesitation when accelerating
- Engine stalling
Causes
- Failed intermediate shaft speed sensor
- Failed transmission input speed sensor
- Failed transmission output speed sensor
- Broken, loose or corroded connectors
- Wiring damage or shorts
- Valve body or pressure related issues
- Failed solenoid
- Failed engine temperature sensor
How to Diagnose the Code?
Believe it or not, dirty or low transmission fluid can actually prevent the ISS sensor from reading an accurate speed. The wiring and connectors on the transmission wiring harness should also be checked for signs of damage. If no problems have been found, then the intermediate shaft speed sensor/ISS sensor will need to be tested. The output shaft speed sensor and engine temperature sensor may also need to be tested as well.
What Transmission Do I Have?
What Repairs Will Fix P2745?
- Replace intermediate shaft speed sensor
- Replace output speed sensor
- Replace input speed sensor
- Repair or replace damaged wiring and/or connectors
- Replace the engine temperature sensor
- Change transmission fluid and filter
- Flush transmission fluid
- Fix transmission fluid leaks
- Reprogram ECU/TCM
Related Codes
- P2746 – Intermediate Shaft Speed Sensor B Circ Range/Performance
- P2747 – Intermediate Shaft Speed Sensor B Circ No Signal
- P2748 – Intermediate Shaft Speed Sensor B Circ Intermittent
- P2749 – Intermediate Shaft Speed Sensor C Circ
- P2750 – Intermediate Shaft Speed Sensor C Circ Range/Performance
- P2751 – Intermediate Shaft Speed Sensor C Circ No Signal
- P2752 – Intermediate Shaft Speed Sensor C Circ Intermittent
