Code result
U3012
Control Module Improper Wake-up Performance
Moderate severity
What it means
The control module did not wake up cleanly from sleep mode — wake event timing or sequence outside spec.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Module internal fault
highOne of the most commonly reported causes for this code — check this first.
Wake signal noise or glitch
mediumA plausible cause — test and verify before replacing parts.
Gateway module routing CAN messages incorrectly
lowLess common, but worth ruling out after the more likely causes.
Related help
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