Each shift solenoid is responsible for certain actions within the transmission, such as engaging clutches or gears. It accomplishes these actions by directing the flow of pressurized transmission fluid into the correct channel. If the ECU detects an abnormally low voltage signal from the shift solenoid E control circuit, it will log a DTC P0985.
How severe is the code?
If the ECU detects a low voltage signal from shift solenoid E (i.e., solenoid number five), it means the solenoid is not responding correctly, which will result in a number of transmission problems. Therefore, a P0985 diagnostic code is very severe.
Symptoms
Symptoms of a P0985 include:
- Shifts are harsh and rough
- The transmission cannot shift into gear
Causes
- Transmission fluid is too low or too dirty
- Damaged wiring and/or connectors
- Faulty shift solenoid
How to diagnose the code?
The diagnostic process for a P0985 OBDII trouble code should begin with an inspection of the transmission fluid level and condition. Dirty transmission fluid can actually hinder solenoid operation, so the transmission must be serviced immediately if the level and condition do not meet specifications. The wiring and connectors along the transmission wiring harness will also need to be carefully inspected. If no broken wires or damaged/corroded connectors are found, then shift solenoid E must be checked.
What repairs will fix P0985?
- Service the transmission
- Replace or repair damaged wiring/connectors
- Replace the shift solenoid
Related Codes
P0984 – Shift Solenoid “E” Control Circuit Range/Performance
P0986 – Shift Solenoid “E” Control Circuit High