P2751
Intermediate Shaft Speed Sensor C Circuit No Signal
Automatic transmission
Generic OBD-II
Medium
What it means
P2751 means the transmission controller is receiving no signal from intermediate shaft speed sensor C. This sensor reports how fast an internal shaft is turning, which the controller uses to time shifts and confirm gear ratios. Losing it typically causes harsh shifting or a protective limp mode. It is a transmission-side fault and does not affect starting the engine.
Medium
Can I keep driving? Drivable, but expect harsh shifts or limp mode because the controller has lost a speed reference it uses to time gear changes.
Common symptoms
What you'll notice
- Check-engine light on
- Harsh, delayed, or erratic shifts
- Transmission stuck in one gear (limp mode)
- Incorrect-gear-ratio codes may set alongside this one
Common causes
Most likely first
- Failed intermediate shaft speed sensor CLikely
- Open circuit or break in the sensor wiringCommon
- Corroded or loose connector at the sensor or TCMCommon
- Debris on the sensor tip or a damaged reluctor/tone ringLess often
- Faulty TCM (least likely)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and check for companion speed-sensor or ratio codes.
- Inspect the sensor connector and wiring for an open circuit or corrosion.
- Check the sensor tip and reluctor ring for debris or damage.
- Measure the sensor's signal or resistance and confirm supply and ground.
- Replace the speed sensor if it produces no signal; otherwise repair the wiring. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P2751?+
Short trips are usually okay, but without this speed signal the transmission may shift roughly or lock into limp mode. Get it repaired before extended driving to avoid strain on the transmission.
Can I just clear P2751?+
It will return until the sensor or its wiring is repaired. Clearing does not restore the missing speed signal.
Related codes
Often seen with P2751
Read & clear P2751 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