Signal voltage from the EVAP fuel tank pressure sensor is below the minimum threshold, typically under 0.1 V. The ECU detects a short to ground or sensor failure.
Common causes
Short to ground in signal wire
Corroded or damaged connector
Failed pressure sensor
Reference voltage loss
Symptoms
MIL illuminated
EVAP monitor fails
No driveability impact
Severity
Low — does not affect driveability but prevents emissions monitoring.