Code result
U05C1
Invalid Data Received From Active Radiator Air Flow Control Module A
Moderate severity
What it means
A receiving module detected implausible data from active radiator air flow control module A. Active grille shutter or fan staging values fail plausibility checks and are rejected.
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 or sensor input drift
highOne of the most commonly reported causes for this code — check this first.
Software version mismatch after replacement
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
Get the full diagnosis
Add your vehicle and see step-by-step repair help, recalls, and TSBs in Wrenchify.
Diagnose U05C1 freeNo credit card required