Transmission Range Sensor Not Learned
The P280A code indicates that the transmission range sensor (TRS) has not completed its learning procedure. This sensor tells the powertrain control module (PCM) which gear the driver has selected. When the sensor is not learned, the PCM cannot accurately determine the gear position, leading to potential shifting issues and safety concerns. This often occurs after replacing the sensor, transmission, or PCM, or after a battery disconnect.
01. Most Common Causes
- Transmission range sensor not calibrated after replacement
- Faulty transmission range sensor
- Wiring or connector issues in the sensor circuit
- PCM software needs update or relearn procedure
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Transmission may not shift properly or stuck in one gear
- Incorrect gear indication on dashboard
- Vehicle may not start or start in wrong gear
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to read the code and check for related codes.
Step 2: Inspect the transmission range sensor connector and wiring for damage or corrosion.
Step 3: Perform the transmission range sensor learn procedure using a scan tool or following manufacturer's instructions.
Step 4: If the code returns, test the sensor resistance and voltage per service manual.
Step 5: Replace the sensor if faulty, then repeat the learn procedure.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. The transmission may not shift correctly, potentially causing unsafe driving conditions or transmission damage.
How much does it cost to fix?▼
If only a relearn procedure is needed, cost is typically $50-$150 at a shop. Sensor replacement can add $100-$300 for parts and labor.