P0770
Powertrain Codes
P0770 - KIA - Reduction Solenoid Valve System Fault
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light) - Transmission will not shift gears.
Possible Causes
- Low transmission fluid level - Dirty transmission fluid - Faulty reduction solenoid valve - Reduction solenoid valve harness or connectors - Reduction solenoid alve circuit is open or shorted
When Detected
The P0770 code is detected when the ECM detects an improper voltage drop when it tries to operate the solenoid valve.
Description
Reduction solenoid valve is turned ON or OFF by the Transmission Control Module (TCM) in response to signals sent from the park/neutral position (PNP) switch, vehicle speed and Engine Control Module (ECM) (throttle opening). Gears will then be shifted to the optimum position.