Transmission Pressure Circuit Solenoid Open or Short to Ground
The transmission pressure control solenoid has an electrical problem—either an open circuit (broken wire) or a short to ground (unwanted connection). It's like a light switch that's either stuck open or electrically damaged, preventing the transmission from controlling fluid pressure properly.
The ECM monitors the solenoid circuit voltage and resistance while commanding the pressure control solenoid on and off. It expects specific voltage and current draw; an open circuit shows no current flow, while a short to ground shows excessive current or zero voltage resistance.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Solenoid Circuit Voltage | 12V when energized, 0V when de-energized | No voltage change detected or continuous short |
| Solenoid Circuit Current | 0.5–2.0 amps typical draw | Zero amps (open) or excessive amps (short to ground) |
Code P1913 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, P1913 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.