P0968
Pressure Control Solenoid C Control Circuit / Open
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's pressure control solenoid C has a broken electrical connection or is not responding to commands. Think of it like a light switch that won't turn on—the wiring is there, but the circuit is open so electricity can't flow.

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Symptoms You May Notice
3 known symptoms for this code
Transmission shifting harshly or delayed shifts
Check Engine Light illuminated
Transmission slipping or limp mode engagement
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ECU sends a control signal to solenoid C to modulate transmission fluid pressure during gear changes. It monitors the solenoid's response by measuring voltage feedback and coil resistance. If the circuit is open, no current flows and the ECU detects zero resistance or no voltage drop.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Solenoid Coil Resistance 5-15 ohms Open circuit (infinite/very high resistance)
Control Signal Voltage 12V PWM signal present No voltage response or dropout
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Wiring harness connector to solenoid C
Inspect and reseat the connector; clean corrosion from terminals with dielectric grease.
2
Wiring and fuses in solenoid C circuit
Check for broken wires, loose splices, and blown fuses in the transmission control circuit.
3
Pressure Control Solenoid C
Replace the solenoid if wiring and connectors are intact and resistance reading is infinite.