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Home / DTC / P262B — Control Module Power Off Timer Performance

P262B — Control Module Power Off Timer Performance

Detailed page for trouble code P262B.

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P262B

Generic P — Powertrain

Control Module Power Off Timer Performance

Brand: Generic
Type: P — Powertrain
Views: UK: 13 EN: 16 RU: 13
AI status
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Page language: EN

Causes

  • Low or weak vehicle battery voltage during/after key‑off
  • Poor or corroded ground(s) at the control module
  • Open, shorted or intermittent power/ignition wiring to the control module
  • Parasitic current draw from accessories or aftermarket devices
  • Faulty ignition switch or ignition relay not releasing properly
  • Control module internal fault or corrupted software/calibration

Symptoms

  • DTC stored in powertrain/electronics module memory
  • Excessive battery drain or dead battery after vehicle sits
  • Modules or accessories remain powered after ignition OFF
  • Delayed module sleep or modules repeatedly wake up
  • Illumination of warning lamps related to module communication or power

What to check

  • Read stored freeze frame and all related DTCs with a capable scan tool
  • Check battery voltage and state of charge (at rest and during the event)
  • Inspect and verify module power and ground connectors for corrosion, damage, or looseness
  • Check for technical service bulletins (TSBs) related to power‑off timer or module software
  • Perform a parasitic draw test to measure current when vehicle is supposed to be asleep
  • Monitor CAN/bus activity and module power pin voltages during key‑off to observe sleep/wake behavior

Signal parameters

  • Battery voltage at module with ignition OFF: typically ~12.2–12.8 V (depends on battery charge)
  • Parasitic current draw when asleep: typically
  • Ground resistance at module ground:
  • Power‑off timer entry/exit time: should fall within manufacturer specified range (typically seconds to minutes; consult OEM spec)
  • CAN bus activity: should go quiet once modules enter sleep (no continual traffic)

Diagnostic algorithm

  1. Connect a scan tool, record freeze frame and all related DTCs; note time stamp and conditions when DTC set.
  2. Check battery state: measure resting voltage and perform a battery load test. Recharge or replace battery as needed before continuing diagnosis.
  3. Visually inspect harness, power/IGN fuses, relays, connectors, and module grounds for corrosion, looseness or damage; repair any issues and retest.
  4. With ignition OFF, monitor battery current draw (parasitic draw test). If draw is high, isolate circuits by removing fuses/relays one at a time to identify the circuit keeping the vehicle awake.
  5. Backprobe or measure control module Vbatt and ground while reproducing the event (turn OFF ignition and observe power‑off timer behavior and voltages). Log VIN/scan tool data if possible.
  6. Monitor CAN and module wake/sleep messages during the power‑off sequence; identify modules that are not entering sleep.
  7. Remove/disable suspected aftermarket accessories; repeat tests to confirm they are not causing wake events.
  8. If wiring, grounds, and battery are good and parasitic draw is ruled out, check for available software updates or TSBs and perform a module reflash if directed by OEM.
  9. If software update does not resolve and all external circuits test good, consider module bench testing or replacement per OEM procedure.
  10. Clear codes and retest across multiple key‑off cycles to verify repair. Document all findings.
  11. (Safety note: avoid shorting battery terminals or connector pins; isolate circuits before disconnecting modules when instructed by manufacturer procedures.)

Likely causes

  • Low battery voltage or poor battery state of charge
  • Bad or high‑resistance ground(s) at the control module
  • Parasitic drain from an aftermarket accessory or failed module output
  • Faulty ignition switch or power relay not switching to off
  • Internal control module fault or calibration/software bug

Fault status

⚠️ Status
Stored when the control module's power‑off timer operation is outside manufacturer limits—indicates abnormal module power/sleep behavior requiring electrical/system diagnostics.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0562 P0563 P0600 P0601 P0606 P0620
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