P0980
Shift Solenoid C Control Circuit High
Powertrain Transmission Control Solenoid Control 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 C is receiving too much electrical voltage, like a water valve stuck in the open position. This prevents the solenoid from operating properly, disrupting gear changes.

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

The ECM monitors the control voltage supplied to Shift Solenoid C during commanded shifts. When voltage remains abnormally high (exceeding the expected duty cycle threshold), the ECU detects an open circuit, short to power, or wiring fault. The solenoid cannot respond to control signals when over-voltage persists.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Solenoid Control Voltage 0-12V PWM signal at commanded duty cycle Voltage remains above threshold or fails to modulate properly
Circuit Resistance 6-14 ohms (coil resistance) Shorted windings or open circuit detected
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Wiring harness connector
Inspect connector pins for corrosion, looseness, or bent terminals and clean or reseat the connection.
2
Shift Solenoid C
Remove and test solenoid resistance with multimeter; replace if resistance is outside 6-14 ohm range.
3
Transmission wiring harness
Check for pinched, damaged, or shorted wires along the harness route and repair or replace as needed.