What Does the P0990 Code Mean?
The P0990 code specifically refers to a high circuit condition in the Transmission Fluid Pressure Sensor/Switch “E”. This means that the Engine Control Module (ECM) or Transmission Control Module (TCM) has detected an abnormal voltage level in the transmission fluid pressure circuit.
What Causes the P0990 Code?
Several factors can trigger the P0990 code:
- Transmission Control Module (TCM) failure
- Transmission fluid level is low
- Transmission fluid pressure sensor failure
- Wiring issue in the sensor circuit
What Are the Symptoms of the P0990 Code?
When the P0990 code is present, you may experience several symptoms, including:
- Transmission may not shift properly
- Increased fuel consumption
- Delayed or harsh shifts
How Serious Is the P0990 Code?
The P0990 code is considered urgent as it indicates significant malfunctions that could lead to severe damage to the vehicle or pose a safety risk to the driver and passengers. Immediate attention is necessary.
How to Diagnose the P0990 Code
To diagnose the P0990 code, follow these steps:
- Use an OBD-II scanner to confirm the presence of the P0990 code and check for any additional codes.
- Inspect the transmission fluid level and condition; top off or replace as necessary.
- Examine the wiring and connectors for any signs of damage or corrosion.
- Test the transmission fluid pressure sensor for proper function.
- Check the Transmission Control Module (TCM) for faults.
Common Repairs for the P0990 Code
Common repairs to address the P0990 code may include:
- Replacing the transmission fluid pressure sensor
- Repairing or replacing damaged wiring or connectors
- Refilling or flushing the transmission fluid
- Replacing the Transmission Control Module (TCM) if necessary
How Much Does It Cost to Fix the P0990 Code?
The cost to repair the P0990 code can vary significantly based on the underlying issue. Generally, repairs may range from $100 to $1,500, depending on whether a simple wiring fix, sensor replacement, or TCM replacement is needed.
Can I Fix the P0990 Code Myself?
While some aspects of diagnosing and fixing the P0990 code can be handled by DIY enthusiasts, such as checking fluid levels and inspecting wiring, more complex issues like sensor replacement or TCM diagnostics may require professional assistance. It’s crucial to understand the risks of delaying repairs and the potential for further damage.
