P0828: Up and Down Shift Switch Circuit High
The P0828 code indicates that the Powertrain Control Module (PCM) has detected a high voltage condition in the up/down shift switch circuit. This switch, typically located on the gearshift lever or steering wheel, allows the driver to manually shift gears in vehicles with manual shift mode. A high voltage reading suggests a short to power, a faulty switch, or a wiring issue, which can prevent proper gear selection and affect transmission operation.
01. Most Common Causes
- Faulty up/down shift switch
- Short to voltage in the shift switch circuit
- Damaged wiring or connector
- Corrosion in the switch or connector
- Faulty PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Inability to manually shift gears
- Transmission stuck in a single gear
- Erratic shifting behavior
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for additional codes.
Step 2: Visually inspect the shift switch and wiring for damage, corrosion, or loose connections.
Step 3: Test the shift switch circuit voltage with a multimeter; compare to manufacturer specifications.
Step 4: If voltage is high, disconnect the switch and check if voltage drops; if so, replace the switch.
Step 5: If voltage remains high, repair the short to power in the wiring harness.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended as the transmission may not shift properly, potentially causing unsafe driving conditions or further damage.
How much does it cost to fix?▼
Typically $50-$150 for diagnosis and repair, but costs can vary depending on the specific cause and labor rates.