What Does P2748 Mean?
The transmission control module is detecting an intermittent signal from intermediate shaft speed sensor B that cuts in and out during operation. This indicates a loose connection, damaged wiring with intermittent continuity, or a sensor failing internally.
Common Causes
40%
Loose or corroded connection at intermediate shaft speed sensor B connector
30%
Damaged wiring harness with intermittent short or open circuit
20%
Failing sensor with intermittent internal connection or coil breakdown
10%
Excessive vibration causing intermittent sensor mounting or reluctor ring movement
Diagnostic Steps
1
Step 1: Perform wiggle test on sensor connector and wiring while monitoring live data for signal dropouts
2
Step 2: Inspect connector pins for corrosion, bent terminals, or improper seating; clean and secure connection
3
Step 3: Check sensor mounting bolts for proper torque and verify sensor is not loose in housing
4
Step 4: Test drive vehicle over various road conditions while data logging sensor B signal to capture intermittent fault
5
Step 5: Inspect wiring harness routing for areas of chafing against sharp edges or heat sources; repair or reroute as needed
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
The transmission control module is detecting an intermittent signal from intermediate shaft speed sensor B that cuts in and out during operation. This indicates a loose connection, damaged wiring with intermittent continuity, or a sensor failing internally.
The most common cause of P2748 (Intermediate Shaft Speed Sensor B Circuit Intermittent) is: Loose or corroded connection at intermediate shaft speed sensor B connector
Typical repair costs for P2748 range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Intermittent transmission shifting problems will occur unpredictably, potentially causing sudden loss of power or unexpected gear changes while driving. This creates dangerous situations in traffic or during acceleration.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2748 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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