P0985
Shift Solenoid E Control Circuit Low
Powertrain Transmission Control Solenoid Circuit 🟡 Moderate — Fix within a week
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What This Actually Means
In plain language — no jargon

The transmission control computer detected that Shift Solenoid E isn't receiving enough electrical power or has a broken circuit. Think of it like a light switch with a loose wire—the power can't reach the solenoid to make it work.

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Symptoms You May Notice
3 known symptoms for this code
Transmission stuck in one gear or limp mode
Harsh or delayed shifting between gears
Check Engine Light illuminated
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ECM monitors the voltage and current supplied to Shift Solenoid E during activation. It compares the measured solenoid coil resistance and circuit voltage against expected thresholds to detect open circuits, shorts to ground, or insufficient power delivery.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Solenoid Control Voltage 11-14V during activation Below 10V or no voltage detected
Circuit Resistance 4-8 ohms (coil nominal) Open circuit (infinite) or shorted condition
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Wiring connector and terminals
Inspect solenoid E connector for corrosion, loose pins, or water damage and clean with electrical contact cleaner.
2
Transmission harness
Check the wiring between the TCM and solenoid E for damaged insulation, pinches, or broken conductors using a multimeter.
3
Shift Solenoid E
Replace the solenoid if resistance testing shows an open circuit or if wiring checks pass but fault persists.