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Home / DTC / P2505 — ECM/PCM Power Input Signal

P2505 — ECM/PCM Power Input Signal

Detailed page for trouble code P2505.

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P2505

Generic P — Powertrain

ECM/PCM Power Input Signal

Brand: Generic
Type: P — Powertrain
Views: UK: 23 EN: 34 RU: 30
AI status
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Page language: EN

Causes

  • Weak or discharged battery
  • Poor battery positive or ground connections (corrosion, loose terminals)
  • Blown main fuse or fusible link
  • Faulty ignition switch or power relay
  • Damaged or shorted wiring harness to ECM/PCM power input
  • Corroded or loose ECM/PCM connector pins

Symptoms

  • Check Engine Light (MIL) illuminated
  • Intermittent or no-start condition
  • Stalling or erratic engine operation
  • Loss of communication with ECM/PCM on scan tool
  • Electrical accessories may behave erratically
  • Possible multiple unrelated fault codes set

What to check

  • Verify battery state of charge with a reliable meter and perform a battery load test if needed
  • Inspect and clean battery terminals and cables; ensure tight connections
  • Check main fuses, fusible links and ECM/PCM power relays for continuity
  • Visually inspect wiring harnesses and connectors for damage, corrosion or loose pins at the ECM/PCM
  • Measure voltage at the ECM/PCM power input pin(s) with key ON and engine running
  • Check engine and chassis grounds for tightness and corrosion

Signal parameters

  • Battery voltage (Key OFF, engine off): typically 12.0–12.8 V (fully charged battery)
  • Battery voltage (Key ON, engine off): ~12.0–12.8 V (close to battery voltage)
  • Battery voltage (Cranking): should typically remain above ~9.0 V (varies by vehicle)
  • Charging voltage (engine running): typically 13.5–14.8 V
  • Acceptable voltage drop on power feed to PCM is small — typically less than 0.5 V from battery positive to PCM power pin with key ON

Diagnostic algorithm

  1. Retrieve freeze frame and history with a scan tool; note conditions when code set (battery voltage, RPM, temp).
  2. Verify battery voltage and health. If battery is weak, charge or replace before further testing.
  3. Inspect battery positive and negative terminals and clean/tighten as needed.
  4. Check main fuses, fusible links and ignition/run relays that supply power to the ECM/PCM; replace if open or high resistance.
  5. Backprobe the ECM/PCM power input pin(s). With ignition ON (engine off), confirm voltage is within expected range (near battery voltage).
  6. Crank the engine and observe voltage at the PCM — ensure it does not drop below the acceptable cranking threshold for the vehicle.
  7. Wiggle harness and connectors while monitoring voltage and live data to find intermittent opens/shorts.
  8. Inspect and test ground straps and engine/chassis grounds; repair any high-resistance grounds.
  9. If power feed voltage is low or intermittent, trace and repair wiring, connectors, switches or relays in the supply circuit. Repair corrosion, broken wires or replace faulty relays/fuses.
  10. If wiring and supply hardware check good, consider module fault; verify communications and output behavior, then consult manufacturer procedures for ECM/PCM bench testing or replacement. Replace ECM/PCM only after eliminating wiring and power/ground issues.
  11. Clear codes and perform a test drive to confirm the repair. If code returns, continue deeper module-level diagnostics or seek manufacturer-specific diagnostics/software updates.

Likely causes

  • Low battery voltage or poor battery connections
  • Blown or high-resistance main power fuse/fusible link
  • Loose or corroded ECM/PCM connector or ground strap
  • Wiring short to ground or open in power feed to the PCM
  • Intermittent ignition switch or power relay contact
  • Parasitic draw or heavy accessory load causing voltage sag

Fault status

⚠️ Status
ECM/PCM power input signal out of expected range (voltage supply issue detected).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0560 P0562 P0627 P0628 P0600
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