P2747 - Intermediate Shaft Speed Sensor B Circuit No Signal
The P2747 code indicates that the Powertrain Control Module (PCM) has detected no signal from the intermediate shaft speed sensor B. This sensor monitors the rotational speed of the intermediate shaft (also known as the countershaft) in the transmission. The signal is critical for proper shift timing and transmission operation. A loss of signal can lead to erratic shifting, harsh engagement, or transmission malfunction.
1. Most Common Causes
- Faulty intermediate shaft speed sensor B
- Damaged or corroded wiring/connector to sensor B
- Open or short circuit in the sensor circuit
- Faulty PCM (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Erratic or harsh shifting
- Transmission may go into limp mode
- Reduced fuel economy
3. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm P2747 and check for other related codes.
Step 2: Visually inspect the sensor B wiring and connector for damage, corrosion, or loose connections.
Step 3: Test sensor B resistance and voltage using a multimeter; compare to manufacturer specifications.
Step 4: If sensor and wiring are okay, test the circuit continuity from sensor to PCM.
Step 5: Replace sensor B if faulty; clear codes and test drive.
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 go into limp mode, potentially causing further damage.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on vehicle make and model.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.