Transmission Range Sensor Circuit Low
The P2802 code indicates that the Powertrain Control Module (PCM) has detected a low voltage condition in the transmission range sensor circuit. This sensor, also known as the neutral safety switch or transmission position switch, tells the PCM which gear the transmission is in (Park, Reverse, Neutral, Drive, etc.). A low circuit voltage can be caused by a faulty sensor, damaged wiring, poor electrical connections, or a short to ground. This condition can lead to incorrect gear selection, starting issues, or transmission performance problems.
1. Most Common Causes
- Faulty transmission range sensor
- Damaged or corroded wiring/connectors
- Short to ground in the sensor circuit
- Low battery voltage or charging system issue
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Transmission stuck in one gear or fails to shift
- Engine starts only in Park or Neutral (or not at all)
- Incorrect gear display on dashboard
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and note freeze frame data.
Step 2: Inspect the transmission range sensor and its wiring for damage, corrosion, or loose connections.
Step 3: Test the sensor's voltage and resistance per manufacturer specifications.
Step 4: Check battery voltage and charging system to rule out low voltage issues.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving with a faulty transmission range sensor can cause erratic shifting, starting problems, or transmission damage. Have it diagnosed and repaired promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the vehicle and whether the sensor or wiring needs replacement.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.