Shift Solenoid "E" Control Circuit Range/Performance
Diagnostic trouble code P0984 indicates that the powertrain control module (PCM) or transmission control module (TCM) has detected an out-of-range or performance issue within the control circuit for Shift Solenoid 'E'. The module sets this code when the electrical signal from the solenoid circuit does not match the expected parameters for the current driving conditions, suggesting a mechanical or electrical fault affecting gear shifts.
This code should be addressed promptly to avoid drivability issues. Ignoring it can lead to harsh shifting, transmission slipping, and potential internal transmission damage over time.
Common symptoms
- Illuminated Check Engine Light
- Harsh or delayed gear shifts
- Transmission slipping between gears
- Vehicle stuck in a specific gear (limp mode)
- Decreased fuel economy
Likely causes
- Low or contaminated transmission fluid
- Faulty Shift Solenoid 'E'
- Damaged, corroded, or loose wiring and connectors in the solenoid circuit
- Clogged transmission fluid filter or internal hydraulic blockages
- Faulty Transmission Control Module (TCM) or Powertrain Control Module (PCM)
What to check before replacing parts
Check the transmission fluid level and condition.
Look for: Fluid that is low, burnt, or heavily contaminated with debris indicates a fluid issue that could cause solenoid performance problems.
Inspect the wiring harness and connectors for Shift Solenoid 'E'.
Look for: Look for frayed wires, melted insulation, corrosion, or loose pins that could cause an intermittent or out-of-range electrical signal.
Test the resistance of Shift Solenoid 'E' using a digital multimeter.
Look for: Compare the measured resistance to the manufacturer's specifications; an open circuit or out-of-spec resistance indicates a faulty solenoid.
Command the solenoid on and off using a bidirectional scan tool.
Look for: Listen for an audible click from the solenoid and monitor the scan tool data to verify if the TCM is successfully controlling the circuit.
Check the transmission line pressure with a mechanical gauge.
Look for: Pressures that are lower or higher than specified can indicate internal hydraulic leaks, a failing pump, or a clogged valve body affecting solenoid operation.
This page explains the generic P0984 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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