P0828 Fault Code

Up and Down Switch Input Circuit High

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0828 fault code indicates a problem with the up and down switch input circuit in a vehicle's transmission system. This circuit helps in detecting the position of the transmission range selector, which is crucial for proper gear shifting. An issue in this circuit could lead to improper functioning of the transmission, causing erratic shifting and affecting vehicle performance.

What are the symptoms of the P0828 code?

Symptoms associated with the P0828 fault code may include:

• Inability to shift gears smoothly
• Unexpected changes in gear when driving
• Transmission may get stuck in one gear
• Warning lights on the dashboard (such as the check engine light)
• Poor acceleration and overall vehicle performance.

What causes the P0828 code?

Common causes of the P0828 code include:

• Faulty up and down switch or associated wiring
• Short circuit or open circuit in the switch input line
• Poor connections at the switch or the transmission control module
• Malfunctioning transmission control module (TCM)
• Corroded connectors or damaged circuit paths.

How to fix P0828?

To fix the P0828 fault code, the following steps can be taken:

• Inspect the up and down switch for any visible damage or malfunction. Replace if necessary.
• Check wiring and connectors for shorts, opens, or corrosion. Repair or replace as needed.
• Use a scan tool to reset the fault codes after making repairs and test drive the vehicle to see if the code returns.
• If the problem persists, further diagnostic testing of the transmission control module may be required to ensure it is functioning correctly.