What Does P1584 Mean?
This code indicates an electrical short to ground in the transmission mount valve solenoid circuit. Active engine/transmission mounts use electronically controlled hydraulic valves to vary stiffness and dampen vibrations at different RPM ranges. When the PCM detects the solenoid control circuit is shorted to ground, it sets this code and the mount remains in a default state.
Common Causes
30%
Short to ground in the transmission mount solenoid control wiring
30%
Failed active transmission mount solenoid (internal short)
20%
Water intrusion or corrosion at the mount solenoid connector
15%
Chafed wiring harness near exhaust or transmission components
5%
PCM driver circuit failure
Diagnostic Steps
1
Locate the active transmission mount and its electrical connector; inspect for physical damage, oil contamination, and corrosion.
2
Disconnect the mount solenoid connector and measure solenoid resistance; compare to specification (typically 10–30 ohms).
3
With the solenoid disconnected, check the control circuit from the PCM side for continuity to ground—there should be none.
4
Inspect the wiring harness routing for chafing against the transmission case, exhaust heat shields, or frame components.
5
If the wiring is intact, replace the active transmission mount assembly and clear codes.
6
Road test and verify the mount switches stiffness at the appropriate RPM thresholds with no code return.
Estimated Repair Cost
$200 - $700
Parts + labor, varies by vehicle and location
This code indicates an electrical short to ground in the transmission mount valve solenoid circuit. Active engine/transmission mounts use electronically controlled hydraulic valves to vary stiffness and dampen vibrations at different RPM ranges. When the PCM detects the solenoid control circuit is s...
The most common cause of P1584 (Transmission mount valves Short to ground) is: Short to ground in the transmission mount solenoid control wiring
Typical repair costs for P1584 range from $200 to $700, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Not a direct safety hazard. The vehicle will exhibit increased vibration at idle or during certain RPM ranges, which can be uncomfortable and may accelerate wear on other drivetrain components over time.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1584 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission / Engine Mount Control
Difficulty
Type
Manufacturer
Recommended Tools
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