Intermediate Shaft Speed Sensor B Circuit Range/Performance
The Intermediate Shaft Speed Sensor B circuit is detecting a signal that is outside the expected range or performance parameters. This sensor monitors transmission shaft speed to optimize shifting, and a fault prevents the transmission control module from properly controlling gear changes and engine performance.
What You Might Notice
- Hard or rough shifting between gears
- Multiple warning lights on the dashboard
- Poor overall driveability and acceleration
- Erratic engine speed fluctuations
- Transmission stuck in limp mode or safe mode
Most Common Causes
- 1
Defective Intermediate Shaft Speed Sensor
The sensor itself may be damaged, worn out, or producing an out-of-range signal. This is the most common cause of P2746.
- 2
Wiring or Connector Issues
Broken, corroded, or loose wires and connectors between the speed sensor and transmission control modules can interrupt the signal circuit.
- 3
Low or Dirty Automatic Transmission Fluid
Contaminated or insufficient ATF can affect sensor operation and overall transmission function, causing false signal readings.
- 4
Internal ECM or TCM Malfunction
A faulty engine or transmission control module may misinterpret sensor signals or fail to process them correctly.
How to Diagnose It
- 1
Check Defective Intermediate Shaft Speed Sensor — The sensor itself may be damaged, worn out, or producing an out-of-range signal. This is the most common cause of P2746.
- 2
Check Wiring or Connector Issues — Broken, corroded, or loose wires and connectors between the speed sensor and transmission control modules can interrupt the signal circuit.
- 3
Check Low or Dirty Automatic Transmission Fluid — Contaminated or insufficient ATF can affect sensor operation and overall transmission function, causing false signal readings.
- 4
Check Internal ECM or TCM Malfunction — A faulty engine or transmission control module may misinterpret sensor signals or fail to process them correctly.
How to Fix It
- 1
Inspect and Replace Speed Sensor
Locate the intermediate shaft speed sensor, inspect it for damage or corrosion, and replace if faulty. This typically resolves the code when the sensor is the root cause.
- 2
Check and Repair Wiring
Inspect all wiring and connectors between the speed sensor and transmission control module for damage, corrosion, or loose connections. Repair or replace damaged wiring.
- 3
Service Transmission Fluid
Perform a transmission fluid and filter change to remove contamination and ensure proper fluid level. This can improve sensor operation if fluid condition is the issue.
- 4
Diagnose Control Module
If other fixes do not resolve the code, have the transmission control module (TCM) and engine control module (ECM) scanned with advanced diagnostics to rule out internal electronic faults.
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