P2746 code meaning
Intermediate Shaft Speed Sensor B Circuit Range/Performance
Powertrain system Generic code P27xx codes Check engine light
What P2746 means
P2746 means the sensor B signal exists but does not make sense. GM's 2023/24 dual-clutch TCM uses it for the clutch 2 speed sensor: with that clutch fully closed and no microslip, its speed must equal engine speed, and a gap of 150 rpm or more for 1.1 s sets the code; further tests compare it with the speed derived from the output shaft and watch synchronizer speed during gear engagement (above 200 rpm for 50 ms). GM lists it as Type A, so the MIL comes on at the first failure. Ford's 2024 summary bundles three checks of sensor B here: dropouts (800 rpm lost within 10 ms, ten times), noise (2,500 spikes of 300 rpm within 50 ms) and a mismatch with gear and other sensors lasting 2.5 s.
P2746 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 6 hours
- Clears after repairAfter a drive cycle
Symptoms of P2746
- Check engine light, often immediately
- Jerky clutch engagement or erratic shifts
- Limp-home mode or one half of the gearbox disabled
Common causes of P2746
- Most likelyMetal debris on the sensor tip or incorrect air gap to the reluctor
- PossibleInterference or poor shielding causing signal spikes
- PossibleSlipping clutch making the speed comparison fail
- Less likelyDamaged or loose reluctor ring on the shaft
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Intermediate shaft speed sensor bTone wheel
What each part of P2746 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 7 | Area: transmission. |
| 46 | The exact fault in that area. |
What to do next
- Note P2746 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2746
What does P2746 mean?
P2746 means "Intermediate Shaft Speed Sensor B Circuit Range/Performance". P2746 means the sensor B signal exists but does not make sense. It is a generic code, so it means the same on every make.
Is it safe to drive with P2746?
Drive gently and only to a workshop. With P2746 the car can go into limp mode (reduced power) to protect itself.
Will P2746 fail an emissions test?
Yes, it can. P2746 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2746 to fix?
Difficulty: hard. A typical repair takes 1 to 6 hours of work. This is a job for a workshop.
Will P2746 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.