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 transmission shift timing and torque converter lockup. A loss of signal can cause erratic shifting, harsh engagement, or transmission slippage.
01. Most Common Causes
- Faulty intermediate shaft speed sensor B
- Open or shorted wiring in the sensor circuit
- Poor electrical connection at the sensor or PCM
- Damaged reluctor ring or tone wheel on the intermediate shaft
- Internal transmission mechanical failure
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Harsh or erratic shifting
- Transmission slipping or failure to shift
- Reduced fuel economy
- Transmission stuck in limp mode
03. Step-by-Step Diagnosis
Step 1: Connect a scan tool and verify the code P2747. Check for additional transmission-related codes.
Step 2: Inspect the wiring and connector for the intermediate shaft speed sensor B for damage, corrosion, or loose connections.
Step 3: Measure the sensor resistance and compare to manufacturer specifications (typically 200-1000 ohms).
Step 4: Check for AC voltage output from the sensor while rotating the intermediate shaft (if accessible) or during a road test.
Step 5: Inspect the reluctor ring for damage or debris. If no issues found, replace the sensor.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not recommended. Driving with a faulty intermediate shaft speed sensor can cause unpredictable transmission behavior, leading to potential accidents or further transmission damage.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the vehicle and shop rates. The sensor itself is usually inexpensive, but labor may vary if the sensor is difficult to access.