What Does P1450 Mean?
The powertrain control module has detected an open circuit in the wiring to the EVAP leak detection switching solenoid. This means no current flow is detected, indicating a broken wire, disconnected connector, or failed solenoid coil.
Common Causes
35%
Disconnected or corroded electrical connector at switching solenoid
30%
Failed switching solenoid with open coil winding
25%
Broken or chafed wiring harness between PCM and solenoid
10%
Blown fuse or failed relay in EVAP system power circuit
Diagnostic Steps
1
Step 1: Inspect electrical connector at DM-TL switching solenoid for corrosion, damage, or loose fit
2
Step 2: Measure resistance across switching solenoid terminals (typically 20-50 ohms when functional)
3
Step 3: Check for continuity in wiring from PCM connector to solenoid connector
4
Step 4: Verify power and ground supply to DM-TL module using wiring diagram
5
Step 5: Replace switching solenoid or repair wiring as needed based on test results
Estimated Repair Cost
$120 - $450
Parts + labor, varies by vehicle and location
The powertrain control module has detected an open circuit in the wiring to the EVAP leak detection switching solenoid. This means no current flow is detected, indicating a broken wire, disconnected connector, or failed solenoid coil.
The most common cause of P1450 (Diagnostic Module Tank Leakage (DM-TL) Switching Solenoid Open Circuit) is: Disconnected or corroded electrical connector at switching solenoid
Typical repair costs for P1450 range from $120 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to operate. Will only affect emissions system diagnostics and may prevent EVAP monitor from completing.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1450 to identify the root cause.
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Quick Info
Category
Powertrain
System
Evaporative Emissions System
Difficulty
Type
Manufacturer
Recommended Tools
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