Upshift Switch Circuit Range/Performance
The P2775 code indicates that the powertrain control module (PCM) has detected an issue with the upshift switch circuit, specifically that the signal from the switch is out of the expected range or not performing correctly. This switch is typically located on the gearshift lever or steering wheel and signals the transmission to upshift. A faulty switch, wiring issues, or a malfunctioning PCM can cause this code.
01. Most Common Causes
- Faulty upshift switch
- Damaged wiring or connectors in the upshift switch circuit
- Corrosion or poor electrical connections
- Malfunctioning PCM
02. Symptoms You Will Notice
- Transmission fails to upshift when requested
- Check Engine Light illuminated
- Erratic shifting behavior
- Reduced fuel economy
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for other related codes.
Step 2: Visually inspect the upshift switch and its wiring for damage, corrosion, or loose connections.
Step 3: Test the upshift switch resistance and continuity with a multimeter according to manufacturer specifications.
Step 4: If the switch and wiring are okay, check for PCM software updates or replace the PCM if necessary.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally not recommended to drive with this code as it can cause erratic shifting and potential transmission damage. Have it diagnosed promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on whether the switch or wiring needs replacement.