P1786
Transmission System Second or Third Gear Fault
P1786 is an OBD-II diagnostic trouble code meaning: Transmission System Second or Third Gear Fault. Common causes: low or contaminated transmission fluid, shift solenoids malfunction. Estimated repair cost: $22–167.
Symptoms
- Incorrect gear shifting
- Delays when switching to second or third gear
- Power dips
- Increased noise during gearbox operation
- Switching to emergency mode
Causes
- Low or contaminated transmission fluid
- Shift solenoids malfunction
- Problems with the hydraulic block
- Wear of mechanical components of the gearbox
- Problems with electronic control (TCM)
How to Fix
- Check the level and condition of the transmission fluid
- Diagnose the gearshift solenoids
- Check the hydraulic unit for leaks and damage
- Inspect the mechanical components of the transmission
- Check electrical connections and wiring harness
Related codes
Error P1786 by Vehicle Brand
FAQ
What does the P1786 code mean?
P1786 is an OBD-II diagnostic trouble code that indicates: Transmission System Second or Third Gear Fault
What causes a P1786 error code?
The most common causes of P1786 include: Low or contaminated transmission fluid; Shift solenoids malfunction; Problems with the hydraulic block; Wear of mechanical components of the gearbox.
How do I fix a P1786 diagnostic trouble code?
To fix P1786: Check the level and condition of the transmission fluid. Diagnose the gearshift solenoids. Check the hydraulic unit for leaks and damage. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P1786?
Limited driving only, diagnose soon
How much does it cost to fix P1786?
The estimated repair cost for P1786 is $22–167. Actual cost depends on your vehicle, location, and labor rates.
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