P2779
Downshift Switch Circuit Range/Performance
P2779 is an OBD-II diagnostic trouble code meaning: Downshift Switch Circuit Range/Performance. Common causes: downshift switch malfunction, open or short circuit in wiring. Estimated repair cost: $17–89.
Symptoms
- Inability to downshift
- Incorrect operation of the low gear mode
- Turning on the emergency mode of the gearbox
- Check Engine Light or Transmission Malfunction Is On
- Reduced vehicle dynamics when driving downhill
Causes
- Downshift switch malfunction
- Open or short circuit in wiring
- Contact problems or terminal oxidation
- Transmission control module (TCM) malfunction
- Problems with the control unit software
How to Fix
- Check the downshift switch for malfunctions
- Check the integrity of the wiring and the condition of the contacts
- Diagnose the transmission control module (TCM)
- If necessary, replace or reprogram the control unit
Related codes
Error P2779 by Vehicle Brand
FAQ
What does the P2779 code mean?
P2779 is an OBD-II diagnostic trouble code that indicates: Downshift Switch Circuit Range/Performance
What causes a P2779 error code?
The most common causes of P2779 include: Downshift switch malfunction; Open or short circuit in wiring; Contact problems or terminal oxidation; Transmission control module (TCM) malfunction.
How do I fix a P2779 diagnostic trouble code?
To fix P2779: Check the downshift switch for malfunctions. Check the integrity of the wiring and the condition of the contacts. Diagnose the transmission control module (TCM). For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P2779?
Yes, but get it checked soon
How much does it cost to fix P2779?
The estimated repair cost for P2779 is $17–89. Actual cost depends on your vehicle, location, and labor rates.
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