Each shift solenoid is responsible for certain actions inside the transmission, like pushing clutch packs or gears into place. It accomplishes those actions by directing the flow of pressurized transmission fluid down the right channel. If the ECU detects an unusually low voltage signal coming from the shift solenoid E control circuit, it will save a P0985 DTC.
How Serious is the Code?
If the ECU detects a low voltage signal coming from the shift solenoid E (i.e. the number five solenoid), it means that the solenoid isn’t responding properly, and that will result in a number of transmission problems. So a P0985 diagnostic trouble code is very serious.
Symptoms of a P0985 include:
- Gear changes are abrupt and harsh
- Transmission may not shift into gear
- Transmission fluid is too low or too dirty
- Damaged wiring and/or connectors
- Broken shift solenoid
How to Diagnose the Code?
The process of diagnosing a P0985 OBDII trouble code, should begin with an examination of the level and condition of the transmission fluid. Dirty transmission fluid can actually hinder the operation was solenoid, so the transmission should be serviced immediately, if the level and condition is not up to spec. The wiring and connectors along the transmission wiring harness will also need to be carefully examined. If no broken wires or broken/corroded connectors are found, then the shift solenoid E should be checked.
What Repairs Will Fix P0985?
- Service the transmission
- Replace or repair damage wiring/connectors
- Replace shift solenoid
- P0984 – Shift Solenoid “E” Control Circuit Range/Performance
- P0986 – Shift Solenoid “E” Control Circuit High