Transmission Range Sensor Circuit Intermittent
The P2804 code indicates an intermittent fault in the transmission range sensor (TRS) circuit. The TRS, also known as the neutral safety switch or manual lever position sensor, tells the PCM which gear the driver has selected. An intermittent circuit issue means the signal is lost or erratic, often due to a loose connection, damaged wiring, or a failing sensor. This can cause incorrect gear selection, starting problems, or transmission performance issues.
01. Most Common Causes
- Loose or corroded electrical connector at the transmission range sensor
- Damaged wiring or short circuit in the sensor circuit
- Faulty transmission range sensor (internal failure)
- Intermittent ground or power supply issue
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Transmission stuck in limp mode or fails to shift properly
- Engine starts only in Park or Neutral intermittently
- Erratic gear position display on the dashboard
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and record freeze frame data to capture conditions when the fault occurred.
Step 2: Visually inspect the transmission range sensor connector and wiring for damage, corrosion, or loose pins.
Step 3: Test the sensor's resistance and voltage signals according to manufacturer specifications using a multimeter.
Step 4: If no obvious issues, clear the code and perform a test drive to see if the code returns; if intermittent, wiggle the harness while monitoring the sensor signal.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can cause unpredictable transmission behavior, including sudden gear engagement or failure to shift, which may lead to an accident or further transmission damage.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, depending on whether it's a simple connector fix or sensor replacement. Parts cost around $20-$80, labor $50-$100.