Intermediate Shaft Speed Sensor B Circuit Malfunction
The P2745 code indicates a problem with the intermediate shaft speed sensor B circuit. This sensor monitors the rotational speed of the intermediate shaft (also known as the layshaft) within the transmission. The Powertrain Control Module (PCM) uses this data to determine shift timing and torque converter lockup. A fault in this circuit can lead to erratic shifting, transmission slippage, or even limp mode. Common causes include a faulty sensor, damaged wiring, or a poor electrical connection.
01. Most Common Causes
- Faulty intermediate shaft speed sensor B
- Damaged or corroded wiring/connectors in the sensor circuit
- Transmission fluid contamination or low fluid level
- Internal transmission mechanical failure
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Harsh or erratic shifting
- Transmission slipping or delayed engagement
- Vehicle may enter limp mode
03. Step-by-Step Diagnosis
Step 1: Scan the vehicle for 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 up or replace if necessary.
Step 5: If all else is fine, replace the intermediate shaft speed sensor B.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances with this code, as it can cause transmission damage or unsafe driving conditions. Limp mode may limit speed and gear selection.
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.