P2746: Intermediate Shaft Speed Sensor B Circuit Range/Performance
The P2746 code indicates that the transmission control module (TCM) has detected an intermediate shaft speed sensor B signal that is out of the expected range or performance. This sensor monitors the rotational speed of the intermediate shaft inside the transmission. A range/performance issue means the signal is present but not within normal parameters, often due to a faulty sensor, wiring problems, or mechanical issues within the transmission.
1. Most Common Causes
- Faulty intermediate shaft speed sensor 'B'
- Open, short-to-ground, or short-to-power in the sensor circuit wiring or connectors
- Internal mechanical damage in the transmission (damaged intermediate shaft gears)
- Low transmission fluid level or contaminated fluid
- Internal TCM/PCM failure (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Harsh or erratic shifting
- Transmission slipping or failure to shift
- Reduced fuel economy
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and record freeze frame data.
Step 2: Inspect the sensor and wiring for damage, corrosion, or loose connections.
Step 3: Test sensor resistance and compare to manufacturer specifications.
Step 4: Check transmission fluid level and condition; top off or replace if necessary.
Step 5: If all else is normal, replace the intermediate shaft speed sensor B.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as the transmission may shift erratically or fail, potentially causing further damage.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for a sensor replacement, but can be higher if transmission repairs are needed.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.