Reference meaning
What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
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A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Scan worksheet →Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
P1778STEP MOTOR
Manufacturer communications
3Original wording in English
KIA
TSB: 6 SPD A/T SOLENOID REPLACEMENT – MULTIPLE DTCS - THIS BULLETIN PROVIDES INFORMATION RELATING TO THE REPLACEMENT OF VARIOUS SHIFT SOLENOIDS ON 6-SPEED AUTOMATIC TRANSAXLES WITH DTCS P0741, P0743, P0748, P0753, P0758, P0763, P0768, P0773, P1778 AND P2709. REPLACE THE SOLENOIDS IF CURRENT OR HISTORY CODES ARE PRESENT; DO NOT R…
NISSAN
IF YOU CONFIRM: The vehicle has slower-than-normal acceleration from a stop at times and/or the customer describes the vehicle has slower-than-normal acceleration from a stop at times and/or the MIL is ON with DTC P1778 (STEP MOTOR) stored in Engine and/or Transmission. ACTION: Refer to the REPAIR FLOW CHART on Page 2 of this bu…
NISSAN
IF YOU CONFIRM The vehicle has slower than normal acceleration from a stop at times, and/or the customer describes the vehicle has slower than normal acceleration from a stop at times, and/or The MIL is ON with DTC P1778 (STEP MOTOR) stored in Engine and/or Transmission. and/or Only for Sentra without ABS; MIL is ON with DTC P07…
Check vehicle applicability
45A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Code meaning and manufacturer information
Original wording in English · Historical directory labels; manufacturer applicability has not been established for every entry.
Transmission Reverse I/P Circuit Malfunction
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.