Shift Solenoid "E" Control Circuit Low
The Powertrain Control Module (PCM) or Transmission Control Module (TCM) has detected that the voltage in the control circuit for Shift Solenoid 'E' is lower than the manufacturer's expected range. This typically indicates a short to ground in the wiring or an internal failure within the solenoid itself.
This code requires immediate attention as it can cause erratic shifting, transmission slipping, or force the vehicle into limp mode. Continued driving with this condition may lead to internal transmission damage or leave you stranded.
Common symptoms
- Illuminated Check Engine Light
- Harsh or delayed transmission shifting
- Transmission slipping between gears
- Inability to shift into specific gears
- Vehicle entering limp-home mode
Likely causes
- Short to ground in the Shift Solenoid 'E' wiring harness
- Faulty Shift Solenoid 'E'
- Corroded, loose, or damaged electrical connectors
- Low or severely contaminated transmission fluid
- Internal transmission valve body failure
- Faulty PCM or TCM (rare)
What to check before replacing parts
Check the transmission fluid level and condition.
Look for: Fluid that is very low, burnt, or heavily contaminated with metal shavings, which can cause solenoid malfunction.
Visually inspect the wiring harness and connectors for Shift Solenoid 'E'.
Look for: Chafed wires, melted insulation, or corroded pins that could cause a short to ground in the control circuit.
Use a digital multimeter to test the resistance of Shift Solenoid 'E'.
Look for: A resistance reading that falls outside the manufacturer's specified range, indicating a failed solenoid coil.
Test the control circuit wiring for a short to ground.
Look for: Continuity between the solenoid control wire and the chassis ground when disconnected from the control module.
Use a bi-directional scan tool to manually command Shift Solenoid 'E' on and off.
Look for: An audible click from the transmission; lack of a click confirms an electrical or mechanical failure of the solenoid or its circuit.
This page explains the generic P0985 definition and is general reference information, not a diagnosis for your specific vehicle. Actual causes, severity, and repairs vary by make, model, engine, and mileage — always confirm with a scan tool and a qualified technician before replacing parts.
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