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Home / DTC / P24F0 — Control Module Wake-up Circuit Low

P24F0 — Control Module Wake-up Circuit Low

Detailed page for trouble code P24F0.

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P24F0

Generic P — Powertrain

Control Module Wake-up Circuit Low

Brand: Generic
Type: P — Powertrain
Views: UK: 8 EN: 21 RU: 13
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Page language: EN

Causes

  • Blown fuse or tripped relay on wake/wiring circuit
  • Open, short to ground, or high resistance in wake-up wire or connector
  • Failed or intermittent connector pin contact (corrosion, bent pin)
  • Faulty wake source (e.g., BCM, body control module, ignition switch, telematics unit)
  • Control module internal input circuit failure
  • Low battery/insufficient system voltage or excessive voltage drop

Symptoms

  • No response from the affected control module on key-on or remote wake events
  • Vehicle may not perform functions controlled by the module until ignition is cycled or module is forced awake
  • Extended crank or no crank if a powertrain module fails to wake (depending on module)
  • One or more communication bus messages missing or modules show as not present on a scan tool
  • Interior electronics may not behave normally (e.g., locks, windows, remote start failures)

What to check

  • Connect a factory-level scan tool; confirm P24F0 stored and note freeze-frame data and counts
  • Check battery resting voltage and cranking voltage (should be ~12.6 V at rest, >9.6 V while cranking)
  • Verify related fuses and wake relays are intact and seated correctly
  • Inspect connectors and wiring in the wake signal path for damage, corrosion, bent pins, or water intrusion
  • Backprobe the wake input at the control module with ignition/key in OFF, ACC, and ON to observe changes
  • Check chassis and engine grounds for tightness and corrosion

Signal parameters

  • Wake-line behavior depends on vehicle architecture—consult service manual for exact values
  • Common wake-line types: 12 V switched wake: inactive ~0 V (or open), active ~9–14 V when request present
  • Logic-level or control-line wake (5 V logic): inactive ~0–0.5 V, active ~4–5 V
  • For CAN bus wake: bus idle ~2.5 V (CAN_H ~2.5 V / CAN_L ~2.5 V); wake/traffic shows CAN_H pulses up to ~3.5 V and CAN_L down to ~1.5 V
  • Use oscilloscope to capture waveform if intermittent: expect a clean transition/pulse when wake is commanded

Diagnostic algorithm

  1. Verify DTC: Clear codes, cycle ignition and attempt to reproduce; confirm P24F0 returns and capture freeze-frame.
  2. Battery and power: Measure battery resting voltage and check for excessive voltage drop during crank or wake attempts. Recharge/replace battery if weak.
  3. Fuses/relays: Locate and inspect fuses and relays for the module's wake circuit; replace if faulty.
  4. Visual inspection: Inspect wiring and connectors for the wake input path from the wake-source (ignition switch, BCM, telematics unit) to the affected module. Repair visible damage.
  5. Backprobe and measure: With a digital multimeter or oscilloscope, backprobe the module wake input connector while commanding a wake (key ON, remote request). Confirm expected voltage or waveform per service manual.
  6. Verify grounds: Check resistance from module ground pins to battery negative; clean/tighten ground connections as required.
  7. Isolate loads: Disconnect aftermarket devices or non-essential modules that may hold the line low. Re-test.
  8. Check upstream module: If the wake signal originates from another control module (BCM/IPC), verify that source module wakes and drives the wake line correctly. Scan for related communication or wake-source faults.
  9. Wiring continuity: If signal is low, disconnect both ends and check continuity and resistance of the wake conductor; repair open/high resistance or short-to-ground.
  10. Reprogram/replace: If wiring and upstream sources are good and signal never reaches the module, consider replacing the module input connector or the module itself only after confirming fault is not harness-related. Reprogram or update module software per manufacturer instructions.
  11. Final verification: Clear codes, perform full wake-cycle tests (remote, key, automatic wake scenarios) and confirm normal operation and no reoccurrence of P24F0.

Likely causes

  • Blown fuse or faulty wake relay for the module
  • Open or damaged wake-up wire between wake-source module and affected control module
  • Faulty connector (corroded pins or poor crimp) at the control module
  • Dead/weak battery or poor ground causing voltage drop on wake line

Fault status

⚠️ Status
Control module detected wake-up input at low voltage (no valid wake request). Module did not wake as expected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0100 U0101 U0121 U0073 P0562 P0563
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