P0990
UniversalTransmission Fluid Pressure Sensor/Switch E Circuit High indicates that the Powertrain Control Module (PCM) has detected a higher-than-expected voltage reading from the Transmission Fluid Pressure Sensor/Switch E circuit.
High SeverityThis code signifies that the vehicle's computer is receiving an abnormally high electrical signal from the transmission fluid pressure sensor E. This usually means the sensor or its wiring is faulty, preventing the transmission from accurately determining its internal fluid pressure, which can affect gear shifts.
⚠️ Before You Begin (Safety First)
Always ensure the vehicle is safely supported on jack stands if working underneath. Disconnect the battery before performing any electrical repairs to prevent accidental short circuits or electrical shocks. Allow the engine and transmission to cool down before handling any components to avoid burns.
Common Symptoms
- Check Engine Light illuminated
- Harsh or erratic shifting
- Transmission slipping
- Transmission may enter limp mode
- Delayed engagement of gears
- Poor fuel economy
Common Causes
- Faulty Transmission Fluid Pressure Sensor/Switch E
- Open or short in the sensor circuit wiring
- Corroded or loose electrical connectors
- Internal transmission mechanical failure (less common but possible)
- Faulty Powertrain Control Module (PCM) (rare)
Frequently reported on: Chevrolet Silverado (2007-2013), Ford Explorer (2002-2010), Dodge Grand Caravan (2008-2015), Honda Accord (2003-2007), Nissan Altima (2007-2012)
Diagnostic Steps
- Connect an OBD-II scanner to verify the code and check for any other related codes.
- Visually inspect the wiring harness and connectors for the transmission fluid pressure sensor E for any signs of damage, corrosion, or loose connections.
- Test the voltage at the transmission fluid pressure sensor connector to ensure it is within specifications (refer to service manual).
- If accessible, remove and test the resistance of the transmission fluid pressure sensor E using a multimeter. Compare readings to manufacturer specifications.
- If the sensor is confirmed faulty, replace it following the vehicle's service manual procedures.
- Clear the code and test drive the vehicle to ensure the repair is successful.
👨🔧 When to Call a Professional
If the vehicle experiences severe shifting problems, goes into limp mode, or displays other significant drivability issues, it is highly recommended to consult a professional mechanic immediately to prevent further transmission damage.
Commonly Asked Questions
Can I drive with a P0990 code?
It is not recommended to drive for an extended period with this code. While your vehicle might still operate, prolonged driving could lead to further transmission damage due to improper shifting or fluid pressure regulation.
What is 'Transmission Fluid Pressure Sensor/Switch E'?
This sensor monitors the hydraulic pressure within the transmission at a specific point ('E' circuit). The Powertrain Control Module (PCM) uses this information to manage gear shifts and ensure smooth operation.
Is it expensive to fix P0990?
The cost to fix P0990 can vary. If it's just a faulty sensor and it's easily accessible, the repair might be relatively inexpensive. However, if it involves extensive transmission disassembly or a wiring issue, costs can be higher.
Can a low transmission fluid level cause P0990?
While a low transmission fluid level can cause various transmission issues, a 'Circuit High' error for a pressure sensor usually points to an electrical problem with the sensor or its wiring, rather than fluid level directly. Always check fluid level as part of diagnosis, but it's not the primary suspect for this specific code.
Do I need special tools to diagnose P0990?
You will need an OBD-II scanner to read the code. A multimeter is essential for testing the sensor's electrical circuit and the sensor itself. Depending on the sensor's location, you might need specific wrenches or sockets.