Transmission Range Sensor Circuit Intermittent
The P2804 code indicates an intermittent fault 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). An intermittent signal can cause erratic shifting, starting issues, or incorrect gear selection. The problem may be due to a faulty sensor, damaged wiring, or a poor electrical connection.
1. Most Common Causes
- Faulty transmission range sensor
- Damaged or corroded wiring/connectors
- Intermittent short or open in the circuit
- Low transmission fluid level
2. Symptoms You Will Notice
- Check Engine Light on
- Engine starts only in Park or Neutral intermittently
- Transmission stuck in limp mode or fails to shift
- Incorrect gear indication on dashboard
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Inspect the transmission range sensor connector and wiring for damage, corrosion, or loose pins.
Step 3: Test the sensor's resistance and voltage signals per manufacturer specs.
Step 4: Check transmission fluid level and condition.
Step 5: Clear codes and test drive to see if the code returns.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. The intermittent nature can cause sudden transmission issues, including getting stuck in gear or failing to shift, which may lead to unsafe driving conditions.
How much does it cost to fix?▼
Typically $50-$150 for a sensor replacement if DIY, or $100-$300 at a shop including labor. Wiring repairs may cost more.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.