The P0828: Up and Down Shift Switch Circuit High refers to an issue where the voltage in the up and down shift switch circuit is higher than expected. This condition may prevent the transmission from properly interpreting shift inputs, leading to shifting issues.
P0828 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0828: Up and Down Shift Switch Circuit High |
| Is it serious? | Yes, high voltage can lead to improper gear shifts, affecting drivability and transmission performance. |
| Possible causes | – High voltage in up and down shift switch circuit – Faulty switch or wiring – Faulty transmission control module (TCM) |
| How to diagnose? | – Test up and down shift switch circuit for high voltage – Inspect wiring and connectors – Replace faulty components if needed |
P0828 Meaning
The P0828 code indicates that the up and down shift switch circuit is receiving a higher voltage than required. This could be caused by a faulty shift switch, wiring problems, or issues with the transmission control module (TCM). High voltage in the circuit may lead to erratic or improper shifting behavior.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for any other transmission-related codes that could provide further insight into the problem. | OBD-II Scanner |
| Inspect Up and Down Shift Switch | Visually inspect the up and down shift switch for signs of damage or malfunction. Ensure the switch operates properly and is not stuck. | Flashlight, Safety Gloves |
| Test Up and Down Shift Switch Circuit for High Voltage | Use a multimeter to test the voltage in the up and down shift switch circuit. Compare your readings with the manufacturer’s specifications to verify if the voltage is too high. | Multimeter |
| Inspect Wiring and Connectors | Check the wiring and connectors linked to the up and down shift switch circuit for signs of corrosion, damage, or loose connections. Repair or replace any faulty components as needed. | Multimeter, Flashlight |
| Test Transmission Control Module (TCM) | If the switch and wiring appear functional, test the transmission control module to ensure it is not causing the high voltage issue. | Diagnostic Tool, TCM Test Kit |
| Clear the Code and Test Drive | After repairs, clear the code using an OBD-II scanner and take the vehicle for a test drive to confirm that the issue is resolved. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | After the test drive, re-scan the vehicle to verify that the P0828 code has not returned. If it does, further diagnosis will be required. | OBD-II Scanner |
OBD-II scanner Buyer’s Guide
- Scanner features explained
- Different types of scanners
- Scanners for coding/odometer/ECU/checks
- Best picks + discount codes
I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko