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Home / DTC / P2507 — ECM/PCM Power Input Signal Low

P2507 — ECM/PCM Power Input Signal Low

Detailed page for trouble code P2507.

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11,855generic
22,491specific
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Code

P2507

Generic P — Powertrain

ECM/PCM Power Input Signal Low

Brand: Generic
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Weak or discharged battery
  • Corroded/loose battery terminals or ground connections
  • Blown fuse or fusible link supplying the PCM
  • Faulty ignition switch or relay that feeds PCM power
  • Damaged wiring or connector to the PCM power input
  • Parasitic draw or poor charging system output

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • No-crank or no-start (if voltage very low)
  • Intermittent stall or unexpected shutoff
  • Erratic engine behavior, misfires, or limp-home mode
  • Loss of some electrical accessories or abnormal sensor readings
  • Battery warning lamp or charging system warnings

What to check

  • Read and record freeze-frame and live data with a scan tool; note bus voltage and any related codes
  • Measure battery voltage with key OFF and with key ON (KOEO) and while cranking
  • Inspect battery terminals and cable ends for corrosion and tightness
  • Check ground straps between engine, chassis, and negative battery terminal for secure connection and continuity
  • Verify fuses and fusible links that supply PCM power are intact and have good contact
  • Check ignition switch output/relay supplying PCM power for correct operation

Signal parameters

  • Key OFF, battery resting: ~12.4–12.8 V (typical)
  • Key ON (IGN ON, engine off): PCM power input ≈ battery voltage (within ~0.2–0.5 V)
  • While cranking: system voltage normally remains above ~9.0–10.0 V on healthy batteries; sustained below ~8–9 V may trigger faults
  • Voltage drop on power feed or ground should be
  • Open/high resistance at ground: >1 ohm suggests suspect connection

Diagnostic algorithm

  1. Connect a scan tool, confirm P2507 is present, and review freeze-frame data and related codes (e.g., system voltage codes).
  2. Measure and record battery voltage with engine off, key on, and while cranking. Recharge/replace battery if below specification.
  3. Visually inspect and clean battery terminals, cable ends, and main grounds. Tighten connections to spec.
  4. Check fuses and fusible links for the PCM power feed; wiggle test and measure voltage at both sides of the fuse under key ON.
  5. With key ON, back-probe the PCM power input terminal and confirm it reads battery voltage. If low, trace wiring to the ignition switch/relay and measure at intermediate points.
  6. Perform voltage drop tests: negative (battery negative to PCM ground) and positive (battery positive to PCM power pin) while turning key ON and during cranking. Repair any excessive drop.
  7. Inspect PCM connector for bent pins, corrosion, or water intrusion. Repair or replace damaged connector/wiring as needed.
  8. Test charging system output (alternator/regulator) to ensure it maintains system voltage when engine running; repair charging faults.
  9. If wiring, grounds, fuses, ignition switch, and charging system check good and low-voltage condition persists, consider PCM internal fault and consult manufacturer procedures before replacing PCM.
  10. Clear codes, perform road test/functional checks, and confirm the fault does not return.

Likely causes

  • Low battery resting voltage or voltage drop under load
  • High-resistance ground at engine/chassis ground points
  • Open or high-resistance fuse/fusible link on PCM feed circuit
  • Intermittent ignition switch contact not supplying accessory/IGN voltage
  • Corroded or damaged connector pins at PCM
  • Alternator not charging properly causing system voltage sag

Fault status

⚠️ Status
PCM detected its power input/IGN-switched supply voltage below the expected threshold and set DTC P2507. This indicates the module may be receiving insufficient voltage and requires inspection of battery, power feed, grounds, fuses, ignition switch/relay, and wiring.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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Code

P2507

LAND ROVER P — Powertrain

Power input signal of the engine control module / module power train control

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Weak or discharged battery
  • Corroded/loose battery terminals or ground connections
  • Blown fuse or fusible link supplying the PCM
  • Faulty ignition switch or relay that feeds PCM power
  • Damaged wiring or connector to the PCM power input
  • Parasitic draw or poor charging system output

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • No-crank or no-start (if voltage very low)
  • Intermittent stall or unexpected shutoff
  • Erratic engine behavior, misfires, or limp-home mode
  • Loss of some electrical accessories or abnormal sensor readings
  • Battery warning lamp or charging system warnings

What to check

  • Read and record freeze-frame and live data with a scan tool; note bus voltage and any related codes
  • Measure battery voltage with key OFF and with key ON (KOEO) and while cranking
  • Inspect battery terminals and cable ends for corrosion and tightness
  • Check ground straps between engine, chassis, and negative battery terminal for secure connection and continuity
  • Verify fuses and fusible links that supply PCM power are intact and have good contact
  • Check ignition switch output/relay supplying PCM power for correct operation

Signal parameters

  • Key OFF, battery resting: ~12.4–12.8 V (typical)
  • Key ON (IGN ON, engine off): PCM power input ≈ battery voltage (within ~0.2–0.5 V)
  • While cranking: system voltage normally remains above ~9.0–10.0 V on healthy batteries; sustained below ~8–9 V may trigger faults
  • Voltage drop on power feed or ground should be
  • Open/high resistance at ground: >1 ohm suggests suspect connection

Diagnostic algorithm

  1. Connect a scan tool, confirm P2507 is present, and review freeze-frame data and related codes (e.g., system voltage codes).
  2. Measure and record battery voltage with engine off, key on, and while cranking. Recharge/replace battery if below specification.
  3. Visually inspect and clean battery terminals, cable ends, and main grounds. Tighten connections to spec.
  4. Check fuses and fusible links for the PCM power feed; wiggle test and measure voltage at both sides of the fuse under key ON.
  5. With key ON, back-probe the PCM power input terminal and confirm it reads battery voltage. If low, trace wiring to the ignition switch/relay and measure at intermediate points.
  6. Perform voltage drop tests: negative (battery negative to PCM ground) and positive (battery positive to PCM power pin) while turning key ON and during cranking. Repair any excessive drop.
  7. Inspect PCM connector for bent pins, corrosion, or water intrusion. Repair or replace damaged connector/wiring as needed.
  8. Test charging system output (alternator/regulator) to ensure it maintains system voltage when engine running; repair charging faults.
  9. If wiring, grounds, fuses, ignition switch, and charging system check good and low-voltage condition persists, consider PCM internal fault and consult manufacturer procedures before replacing PCM.
  10. Clear codes, perform road test/functional checks, and confirm the fault does not return.

Likely causes

  • Low battery resting voltage or voltage drop under load
  • High-resistance ground at engine/chassis ground points
  • Open or high-resistance fuse/fusible link on PCM feed circuit
  • Intermittent ignition switch contact not supplying accessory/IGN voltage
  • Corroded or damaged connector pins at PCM
  • Alternator not charging properly causing system voltage sag

Fault status

⚠️ Status
PCM detected its power input/IGN-switched supply voltage below the expected threshold and set DTC P2507. This indicates the module may be receiving insufficient voltage and requires inspection of battery, power feed, grounds, fuses, ignition switch/relay, and wiring.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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