The P0828 trouble code indicates a problem with the up and down shift switch circuit being high.
P0828 Up and Down Shift Switch Circuit High
Code symptoms P0828.
1. Difficulty shifting gears.
2. Incorrect gear selection displayed on the instrument panel.
3. Harsh or erratic shifting.
4. Vehicle may not shift into the correct gear.
5. Check Engine Light (CEL) or Malfunction Indicator Lamp (MIL) may illuminate on the dashboard.
Causes of the code P0828.
1. Faulty up and down shift switch.
2. Wiring problems, such as shorts to power, open circuits, or damaged wiring harnesses, in the switch circuit.
3. Loose or corroded electrical connections at the switch or elsewhere in the circuit.
4. Issues with the transmission control module (TCM).
5. Mechanical problems with the gear selector mechanism.
Code Solutions P0828.
1. Use an OBD-II scanner to retrieve freeze frame data and any additional stored trouble codes. This data can provide insight into when and how the malfunction occurred.
2. Inspect the up and down shift switch and its wiring for signs of damage, corrosion, or loose connections. Replace or repair any damaged components or wiring as necessary.
3. Test the up and down shift switch for proper operation using a multimeter or switch tester. If the switch is faulty, replace it with a new one.
4. Check for proper voltage and ground signals at the switch connector with the key in the ON position. If voltage is high, check for shorts to power in the circuit. Repair any wiring issues if necessary.
5. If the vehicle is equipped with a TCM, perform a diagnostic scan to check for any fault codes related to the up and down shift switch circuit. Address any issues discovered during the scan.
6. If no issues are found with the switch, wiring, or TCM, consider inspecting the gear selector mechanism for any mechanical problems or obstructions that may be preventing proper gear selection.