HOW TO PROCEED WITH TROUBLESHOOTING HINT: This is a flowchart for vehicle pull. 
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Toyota Tundra Service Manual > Meter / Gauge System: Lost Communication with Front Camera Module (U023A)
DESCRIPTION The combination meter assembly communicates with the forward recognition camera via the CAN line. DTC Code DTC Detection Condition Trouble Area U023A When either of following conditions is detected: IG voltage 10.5 V or more No communication with forward recognition camera continues for ...
