P2745
Intermediate Shaft Speed Sensor B Circuit
Automatic transmission
Generic OBD-II
Medium
What it means
P2745 means the TCM detected a fault in the "B" intermediate shaft speed sensor circuit — the sensor that reports rotational speed inside the transmission so it can time shifts correctly. Without a valid signal, shifts can be harsh or the transmission may go into limp mode. The engine still starts and runs; the causes are usually a wiring/connector fault or a failed sensor.
Medium
Can I keep driving? The engine starts and runs, but the transmission may shift harshly, hold a gear, or enter limp mode without a valid speed signal. Drive gently and get it checked.
Common symptoms
What you'll notice
- Check-engine light on
- Harsh or incorrect shifting
- Transmission stuck in one gear or in limp mode
- Speedometer or shift timing acting erratically
Common causes
Most likely first
- Open, short, or high resistance in the intermediate shaft speed sensor 'B' circuitLikely
- Corroded, loose, or damaged sensor connectorCommon
- Failed intermediate shaft speed sensorCommon
- Damaged sensor tone/reluctor ring or metal debris on the sensor tipLess often
- Chafed or broken wiring in the sensor harnessLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and inspect the sensor connector and wiring for damage or corrosion.
- Check the sensor tip for metal debris and inspect the tone ring.
- Measure the sensor's resistance and signal against spec.
- Replace the intermediate shaft speed sensor if it's out of spec, then clear the code.
- Road-test to confirm normal shifting and a stable speed signal.
FAQ
Quick answers
Is it safe to drive with P2745?+
Short, gentle trips may be okay, but without a valid speed signal the transmission can shift poorly or go into limp mode. Have it diagnosed before long drives.
Can I just clear P2745?+
It will clear, but a circuit or sensor fault returns quickly. Repair the wiring or replace the sensor instead of only resetting it.
Related codes
Often seen with P2745
Read & clear P2745 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX