Transmission Fluid Pressure Sensor/Switch Circuit High
The P0995 code indicates that the Powertrain Control Module (PCM) has detected a voltage signal from the transmission fluid pressure sensor or switch that is higher than the expected range. This sensor monitors hydraulic pressure within the transmission to ensure proper shift timing and line pressure. A high circuit condition typically points to a short to voltage, faulty sensor, or wiring issues. This can lead to harsh shifts, slipping, or transmission damage if not addressed.
1. Symptoms You Will Notice
- Check Engine Light illuminated
- Harsh or erratic shifting
- Transmission slipping or delayed engagement
- Reduced fuel economy
2. Most Common Causes
- Faulty transmission fluid pressure sensor
- Short to voltage in sensor wiring or connector
- Damaged or corroded connector pins
- Internal transmission problem causing high pressure
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and record freeze frame data.
Step 2: Visually inspect the sensor and wiring for damage, corrosion, or loose connections.
Step 3: Using a multimeter, check the sensor signal voltage at the PCM connector; compare to manufacturer specs.
Step 4: Test the sensor resistance and compare to specifications; replace if out of range.
Step 5: If wiring and sensor are okay, check for internal transmission issues like a stuck pressure regulator valve.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as high transmission pressure can cause internal damage. You may experience harsh shifts or slipping. Have it diagnosed promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and sensor replacement, but can be higher if wiring repairs or internal transmission work is needed.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.