GM Fault Code

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P068A

Random ECM Reset / Delayed Sleep

System

Electrical / Engine

Symptom

Random ECM Reset / Delayed Sleep

Diagnosis & fix steps

LOGIC: ECM / PCM Power Relay De-Energized Performance - Too Early. ACTION: Test main ECM power relay socket terminals for corrosion. Measure voltage drop across relay contacts under load, and verify battery permanent unswitched 12V supply line integrity.

Red Seal field insights

Memory Retention: The PCM expects continuous unswitched battery power to safely execute its key-off shutdown sequence (writing KAM parameters to EEPROM).

Same code keeps coming back?

That's a program problem, not a part problem. Book a 30-minute uptime review with Grant, a Red Seal Heavy Duty Technician.

Book an uptime review

Read before you touch anything

  • This is general reference information, not a repair manual. It is for trained, qualified technicians.
  • Fault codes, meanings and procedures vary by model, serial number and software version. Confirm the code and the procedure against the manufacturer's service manual before acting.
  • Follow the OEM service manual, torque specs and your site's safety procedures: lockout/tagout, block raised equipment, relieve hydraulic, fuel and air pressure, and let hot systems cool.
  • You use this information at your own risk. Adventure Mechanical and AM Fleet Integrity accept no liability for damage, injury, downtime or loss arising from its use.
  • Not affiliated with or endorsed by any manufacturer. Brand names are used only to identify the equipment a code applies to.

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