Shift Solenoid B Control Circuit Low
The transmission control computer detects that Shift Solenoid B isn't receiving enough electrical power to operate properly. It's like a light switch that's not getting enough current to turn the light on.
The ECM monitors the voltage and current flowing through Shift Solenoid B's control circuit. When voltage drops below the minimum threshold needed to activate the solenoid coil, the ECU logs a fault. The circuit typically operates at 12V, and a significant voltage drop indicates resistance, wiring issues, or a failing solenoid.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Solenoid Control Voltage | 11-14V with proper current draw | Below 10V or insufficient current when commanded on |
| Circuit Resistance | 4-8 ohms coil resistance | Above 15 ohms or open circuit detected |
Code P0976 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P0976 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.