The intermediate shaft speed sensor/ISS sensor tells the ECU when to change gears, based on how fast the intermediate shaft is spinning. If this sensor is not performing properly, then a P2746 DTC will be saved.
What Transmission Do I Have?
How Serious is the Code?
If your vehicle has a P2746 diagnostic trouble code, it means that you will likely experience a number of drivability problems. Some of the transmission problems commonly associated with a P2746 DTC include delayed shifts, harsh shifts and limp mode.
Symptoms
Symptoms of a P2746 include:
- Delayed shifts
- Harsh shifts
- Erratic shifts
- Transmission gets stuck in a gear
- Limp Mode
- Engine misfire
- Hesitation when accelerating
- Engine stalls when coming to a stop
- Non-functioning speedometer
Causes
- Intermediate shaft speed sensor failure
- Transmission input speed sensor failure
- Output speed sensor failure
- Shorts or other wiring damage
- Broken, loose or corroded connectors
- Valve body or pressure related issues
- Faulty shift solenoid
- Engine temperature sensor failure
How to Diagnose the Code?
When diagnosing a P2746 OBDII trouble code, it’s important to check the level and condition of the transmission fluid. The wiring and connectors on the transmission wiring harness should also be checked. Manufacturer TSBs and software updates should be researched to see if there’s a known issue with a solution for this problem. If no problems have been found up to this point, the intermediate shaft speed sensor/ISS sensor should be tested, along with possibly the output shaft speed sensor, the engine temperature sensor and solenoids.
What Transmission Do I Have?
What Repairs Will Fix P2746?
- 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
- P2745 – Intermediate Shaft Speed Sensor B Circ
- 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
