What Does P1389 Mean?
The PCM is not receiving voltage from the Auto Shutdown (ASD) relay output circuit. This relay powers critical fuel and ignition components, and lack of voltage feedback indicates a power supply issue.
Safety Warning
Engine may not start or may stall unexpectedly. Vehicle may be inoperable. Critical safety issue if stalling occurs while driving.
Common Causes
35%
Faulty ASD relay with burned contacts or coil failure
25%
Blown fuse in ASD relay output circuit
20%
Open circuit or damaged wiring from ASD relay to PCM sense circuit
12%
Poor connection at relay socket or corroded terminals
8%
PCM internal sense circuit failure
Diagnostic Steps
1
Step 1: Locate and inspect ASD relay in power distribution center; check fuses related to relay output
2
Step 2: With key on, listen or feel for relay click; test relay coil and contact resistance
3
Step 3: Measure voltage at relay output terminal with key on (should have battery voltage)
4
Step 4: Backprobe PCM connector at ASD sense circuit and verify voltage present during cranking
5
Step 5: Test continuity from relay output through wiring harness to PCM sense terminal
Estimated Repair Cost
$50 - $800
Parts + labor, varies by vehicle and location
The PCM is not receiving voltage from the Auto Shutdown (ASD) relay output circuit. This relay powers critical fuel and ignition components, and lack of voltage feedback indicates a power supply issue.
The most common cause of P1389 (No Auto Shutdown (ASD) Relay Output Voltage At PCM) is: Faulty ASD relay with burned contacts or coil failure
Typical repair costs for P1389 range from $50 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Engine may not start or may stall unexpectedly. Vehicle may be inoperable. Critical safety issue if stalling occurs while driving.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1389 to identify the root cause.
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Quick Info
Category
Powertrain
System
Power Distribution and Engine Management
Difficulty
Type
Manufacturer
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