Transmission Fluid Pressure Sensor Circuit High
The P0848 code indicates that the Powertrain Control Module (PCM) has detected a voltage signal from the transmission fluid pressure sensor 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.
01. Most Common Causes
- Faulty transmission fluid pressure sensor
- Short to voltage in sensor wiring or connector
- Damaged or corroded wiring harness
- Internal transmission problem (e.g., stuck valve)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Harsh or delayed shifts
- Transmission slipping or overheating
- Reduced fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Inspect wiring and connector for damage, corrosion, or shorts.
Step 3: Test sensor voltage and resistance with a multimeter; compare to specs.
Step 4: If sensor is faulty, replace it; if wiring is shorted, repair as needed.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving with a high circuit condition can cause erratic shifting and potential transmission damage. Have it diagnosed promptly.
How much does it cost to fix?▼
Typically $50-$150 for sensor replacement, plus diagnostic fees. Wiring repairs may cost more depending on severity.