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Home / DTC / P24F1 — Control Module Wake-up Circuit High

P24F1 — Control Module Wake-up Circuit High

Detailed page for trouble code P24F1.

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P24F1

Generic P — Powertrain

Control Module Wake-up Circuit High

Brand: Generic
Type: P — Powertrain
Views: UK: 15 EN: 22 RU: 16
AI status
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Page language: EN

Causes

  • Short to battery or other power source on the wake-up/wake-line
  • Shorted or damaged wiring harness or connector (insulation chafing, pin contact)
  • Faulty control module or module wake driver transistor
  • Incorrect aftermarket device or accessory wiring tying into wake circuit
  • Intermittent connection or corrosion at connector or ground
  • Faulty body control module (BCM) or power control module generating incorrect logic level

Symptoms

  • Modules fail to enter sleep (battery drain / parasitic draw)
  • Unexpected module wake-ups or inability to sleep
  • Intermittent or lost communication with other modules
  • Battery parasitic discharge or low battery after park
  • Related warning lights or erratic electrical behavior

What to check

  • Use a scan tool to read live data and freeze frame, confirm P24F1 active and which module logged it
  • Check battery voltage and condition before diagnostics
  • Visually inspect wiring and connectors for the wake circuit, look for pin damage, corrosion, or aftermarket splices
  • Back-probe the wake wire and measure voltage with key off and key on (see signal parameters)
  • Check for DTCs in other modules that indicate communication/wake issues
  • Disconnect suspected aftermarket devices and re-test

Signal parameters

  • Wake line expected voltage when module asleep: typically
  • Wake line expected voltage when awake: approximately battery voltage (~9–16 V depending on system) or a logic high per manufacturer spec
  • Fault condition: wake line reads near battery voltage when it should be low (e.g., >2–4 V and often near 12 V)
  • Typical wake line impedance to ground when asleep: high (kΩ range); a low-ohm reading may indicate a short to battery or stuck driver

Diagnostic algorithm

  1. Confirm the fault with a scan tool, record freeze-frame data and note which module reported P24F1.
  2. Check battery voltage and charging system; ensure stable supply before further tests.
  3. Inspect harness and connectors for the suspected module and trace the wake-up circuit for visible damage or aftermarket taps.
  4. With ignition off, back-probe the wake wire at the module connector and measure voltage. If voltage is high when it should be low, suspect a short to battery or stuck driver.
  5. Isolate the circuit: disconnect the module connector and measure the wake wire voltage at the harness side. If voltage drops to low, the module is likely the source; if still high, the short is upstream.
  6. Wiggle testing: with harness disconnected and ignition in appropriate state, gently move harness to find intermittent shorts or opens. Do not simulate loads that could damage circuits.
  7. If a short to battery is present on the harness side, visually and sniff-test for insulation damage, repair harness or connector as required, then clear codes and retest.
  8. If the harness is OK and the wake line only reads high when the module is connected, consult module replacement/repair procedures and verify updates for known software issues before replacing the module.
  9. After repair, erase codes, cycle ignition and verify the module enters sleep/wake normally and no parasitic drain remains.

Likely causes

  • Wake-up wire shorted to ignition or constant battery feed
  • Damaged connector pins allowing battery voltage onto the wake line
  • Faulty module output transistor stuck on (internal short)
  • Aftermarket alarm/remote start incorrectly wired to wake circuit

Fault status

⚠️ Status
Control module detected the wake-up circuit voltage is higher than the allowable threshold when the module should be in sleep/low-power state. Possible short to battery, faulty wake driver, or wiring/connector fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

Similar codes

P0563 P0562 U0100 P0600 U0121
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