P2780
Downshift Switch Circuit Low
P2780 is an OBD-II diagnostic trouble code meaning: Downshift Switch Circuit Low. Common causes: open or short circuit in downshift circuit, downshift switch malfunction. Estimated repair cost: $17–89.
Symptoms
- Incorrect gear shifting
- Car won't downshift
- Check Engine light comes on
- The car goes into emergency gearbox mode
- Deterioration of vehicle dynamics
Causes
- Open or short circuit in downshift circuit
- Downshift switch malfunction
- Problems with the wiring harness or connectors
- Transmission control module (TCM) malfunction
- Corrosion of contacts in an electrical circuit
How to Fix
- Check the integrity of the wiring and connectors in the switching circuit
- Test the downshift switch
- Check the resistance of the switching circuit
- Scan TCM memory for other errors
- If necessary, replace the switch or repair the wiring
Related codes
Error P2780 by Vehicle Brand
FAQ
What does the P2780 code mean?
P2780 is an OBD-II diagnostic trouble code that indicates: Downshift Switch Circuit Low
What causes a P2780 error code?
The most common causes of P2780 include: Open or short circuit in downshift circuit; Downshift switch malfunction; Problems with the wiring harness or connectors; Transmission control module (TCM) malfunction.
How do I fix a P2780 diagnostic trouble code?
To fix P2780: Check the integrity of the wiring and connectors in the switching circuit. Test the downshift switch. Check the resistance of the switching circuit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P2780?
Limited driving only, diagnose soon
How much does it cost to fix P2780?
The estimated repair cost for P2780 is $17–89. Actual cost depends on your vehicle, location, and labor rates.
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