What Does P2749 Mean?
The transmission control module has detected an electrical problem in the intermediate shaft speed sensor C circuit. This sensor monitors the rotational speed of an intermediate shaft within the transmission to help the TCM determine proper shift timing and gear ratios.
Common Causes
35%
Faulty intermediate shaft speed sensor C
30%
Damaged or corroded wiring harness or connector to sensor C
20%
Short or open circuit in sensor wiring
10%
Failed transmission control module (TCM)
5%
Poor electrical ground connection
Diagnostic Steps
1
Step 1: Inspect sensor C connector and wiring for visible damage, corrosion, or loose connections
2
Step 2: Measure sensor C resistance and compare to manufacturer specifications
3
Step 3: Check voltage supply and ground circuits to sensor C with multimeter
4
Step 4: Test sensor signal output while rotating input shaft (transmission in neutral)
5
Step 5: If all circuits test normal, replace sensor C and retest
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
The transmission control module has detected an electrical problem in the intermediate shaft speed sensor C circuit. This sensor monitors the rotational speed of an intermediate shaft within the transmission to help the TCM determine proper shift timing and gear ratios.
The most common cause of P2749 (Intermediate Shaft Speed Sensor C Circuit) is: Faulty intermediate shaft speed sensor C
Typical repair costs for P2749 range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may experience harsh shifts, delayed engagement, or enter limp mode limiting speed. Safe to drive short distances to a repair facility.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2749 to identify the root cause.
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Quick Info
Category
Powertrain
System
Automatic Transmission
Difficulty
Type
Generic (SAE)
Recommended Tools
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