In most cases, no—P0847 indicates a fault in the transmission fluid pressure sensor/switch 2 circuit and should not be ignored. If the code appears, limit driving and arrange for a professional diagnosis and repair as soon as possible.
What is P0847?
P0847 is an OBD-II diagnostic trouble code that points to a problem in the Transmission Fluid Pressure Sensor/Switch 2 circuit. Depending on the vehicle, this sensor monitors hydraulic pressure in the transmission to help the transmission control module (TCM) manage gear shifts. A high circuit reading can trigger the vehicle’s protection modes, such as limp or limited shifting, to prevent potential damage.
Common causes
The following list covers typical reasons a P0847 code might be stored. The items are not a guarantee of failure in every vehicle, but they cover the most likely scenarios.
- Faulty transmission fluid pressure sensor or a defective sensor circuit
- Damaged or corroded wiring, connectors, or poor ground in the sensor circuit
- Transmission control module (TCM/ECM) software issues or a need for relearn
- Low, dirty, or degraded transmission fluid (ATF) affecting pressure readings
- Transmission pump failure or valve body/solenoid problems affecting pressure
- Intermittent electrical faults causing erratic sensor data
Note: While electrical or sensor faults are common, true hydraulic pressure problems can also trigger this code. A professional diagnostic should confirm the exact cause.
Symptoms you might notice
These are typical symptoms associated with problems that can trigger P0847. If you notice several of these together, avoid driving long distances and seek service promptly.
- Transmission slipping, harsh or delayed shifting
- Vehicle entering limp mode or staying in a single gear
- Check Engine or Transmission warning lights illuminated
- Erratic or unusual transmission behavior during acceleration
- Diagnostic trouble code P0847 stored in the TCM/ECM with accompanying data
Symptoms may also be caused by unrelated transmission faults, so a precise diagnosis is essential to determine the correct repair.
Is it safe to drive with P0847?
Generally, driving a vehicle with a P0847 code is not recommended for extended periods. Depending on the car, you may experience limp mode, limited gears, or unpredictable shifts, which can increase the risk of damage or unsafe driving conditions. If you must move the vehicle, drive slowly and avoid high speeds, aggressive acceleration, or demanding loads, and plan to tow it to a repair facility rather than relying on it for a long trip.
What should you do next?
To address a P0847 code, follow these steps to minimize risk and facilitate a proper repair.
- Safely pull over if you notice warning lights, abnormal shifting, or a sudden loss of transmission function.
- Check the transmission fluid level and appearance (color, odor) if it can be done safely with the engine off and on level ground; low or burnt-smelling ATF can indicate a problem.
- Look for obvious signs of leaks under the vehicle and check for ATF contamination or leaks around the transmission.
- Use a diagnostic tool to confirm P0847 and review live data from the transmission fluid pressure sensor to see if readings are plausible.
- Have the vehicle towed or transported to a qualified shop for a definitive diagnosis and repair; avoid driving long distances until the issue is resolved.
Summary: While some P0847 scenarios may be electrical or sensor-related and not immediately dangerous, the potential for transmission damage warrants professional inspection rather than extended driving.
Additional considerations
Because the exact meaning of P0847 can vary by make and model, consult your vehicle’s service manual or a dealer for model-specific guidance. A technician will typically verify the code with a scan tool, inspect the sensor wiring and connectors, test the sensor output, and check ATF level and quality. Repairs can range from sensor or wiring replacement to software updates or, in rare cases, more extensive transmission work.
Summary
P0847 signals a fault in the transmission fluid pressure sensor/switch 2 circuit and can affect shifting behavior. Do not ignore it. Safely stop if symptoms appear, have the vehicle checked promptly, and avoid long-distance driving until a qualified technician confirms the cause and performs the necessary repair. A timely diagnosis typically prevents further transmission damage and helps restore proper operation.