P1785
Transmission System First or Second Gear Fault Conditions
P1785 is an OBD-II diagnostic trouble code meaning: Transmission System First or Second Gear Fault Conditions. Common causes: shift solenoids malfunction, low or contaminated transmission fluid. Estimated repair cost: $33–167.
Symptoms
- Problems shifting into first or second gear
- The car jerks when changing gears
- The gearbox goes into emergency mode
- Increased engine speed when switching
- Check Engine light comes on
Causes
- Shift solenoids malfunction
- Low or contaminated transmission fluid
- Problems with the gearbox valve body
- Friction disc wear
- Malfunction of shaft speed sensors
How to Fix
- Check the level and condition of the transmission fluid
- Diagnose the operation of switching solenoids
- Check electrical connections and wiring
- Scan the transmission for additional errors
- If necessary, replace faulty gearbox components
Related codes
Error P1785 by Vehicle Brand
FAQ
What does the P1785 code mean?
P1785 is an OBD-II diagnostic trouble code that indicates: Transmission System First or Second Gear Fault Conditions
What causes a P1785 error code?
The most common causes of P1785 include: Shift solenoids malfunction; Low or contaminated transmission fluid; Problems with the gearbox valve body; Friction disc wear.
How do I fix a P1785 diagnostic trouble code?
To fix P1785: Check the level and condition of the transmission fluid. Diagnose the operation of switching solenoids. Check electrical connections and wiring. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P1785?
Do not drive — repair immediately
How much does it cost to fix P1785?
The estimated repair cost for P1785 is $33–167. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat