What Does P2505 Mean?
The engine control module has detected a general fault with its main power supply input circuit. This indicates the PCM is receiving an incorrect or unstable voltage signal from its primary power source.
Safety Warning
Vehicle may experience sudden stalling without warning, creating serious accident risk. Loss of engine power in traffic or at highway speeds is extremely dangerous.
Common Causes
30%
Corroded or loose connections at PCM power supply connector
25%
Faulty ignition switch or ignition switch circuit
20%
Blown fuse or damaged fusible link in PCM power circuit
15%
Damaged wiring harness between power source and PCM
10%
Failed PCM internal power supply circuit
Diagnostic Steps
1
Step 1: Inspect all fuses and relays related to PCM power supply; verify proper voltage at fuse output
2
Step 2: Check PCM connector for corrosion, bent pins, or moisture; clean and secure connections
3
Step 3: Measure voltage at PCM power pins with key on and engine running (typically pin specifications in service manual)
4
Step 4: Test ignition switch output voltage in run and crank positions for proper operation
5
Step 5: Check for voltage drops across PCM power and ground circuits (should be less than 0.1V)
Estimated Repair Cost
$100 - $1,500
Parts + labor, varies by vehicle and location
The engine control module has detected a general fault with its main power supply input circuit. This indicates the PCM is receiving an incorrect or unstable voltage signal from its primary power source.
The most common cause of P2505 (ECM/PCM Power Input Signal) is: Corroded or loose connections at PCM power supply connector
Typical repair costs for P2505 range from $100 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may experience sudden stalling without warning, creating serious accident risk. Loss of engine power in traffic or at highway speeds is extremely dangerous.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2505 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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