What Does P2507 Mean?
The PCM has detected its main power supply voltage is below the minimum acceptable threshold. Insufficient voltage to the engine control module prevents proper operation and may cause module shutdown or erratic engine behavior.
Safety Warning
Engine may stall without warning or fail to start, potentially stranding occupants. If stalling occurs while driving, loss of power steering and reduced brake assist create serious safety concerns.
Common Causes
35%
High resistance or corrosion in PCM power supply wiring or connectors
30%
Undercharging condition from failed alternator or weak battery
20%
Blown fuse, corroded fuse holder, or damaged fusible link
10%
Faulty ignition switch providing insufficient voltage
5%
Poor ground connection at PCM causing voltage reference issues
Diagnostic Steps
1
Step 1: Measure voltage directly at PCM power supply pins; should match battery voltage within 0.5V
2
Step 2: Perform voltage drop test from battery positive to PCM power pins (should be less than 0.2V)
3
Step 3: Test charging system output and battery condition to ensure adequate source voltage
4
Step 4: Inspect and clean all connectors in PCM power supply circuit; check for overheated terminals
5
Step 5: Verify all PCM ground circuits have less than 0.1V drop to battery negative terminal
Estimated Repair Cost
$100 - $1,400
Parts + labor, varies by vehicle and location
The PCM has detected its main power supply voltage is below the minimum acceptable threshold. Insufficient voltage to the engine control module prevents proper operation and may cause module shutdown or erratic engine behavior.
The most common cause of P2507 (ECM/PCM Power Input Signal Low) is: High resistance or corrosion in PCM power supply wiring or connectors
Typical repair costs for P2507 range from $100 to $1,400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Engine may stall without warning or fail to start, potentially stranding occupants. If stalling occurs while driving, loss of power steering and reduced brake assist create serious safety concerns.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2507 to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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