Network, generic (extended)
U351F High Voltage System Interlock Circuit E Low
Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modePossible
U351F reports a low reading on interlock loop E, the usual result when a plug in that loop is separated or one of its wires is grounded. The US standard FMVSS 305a explains the hurry: a high-voltage connector that can be pulled without tools may, as one permitted option, bring its live parts to 60 V DC or less within one second of separation. The interlock gives the early signal for that; Texas Instruments describes the follow-up of stopping traction, opening the power relays and discharging the DC-link capacitors. No maker documents U351F. Expect abrupt loss of drive power and no restart until loop E reads normal.
Likely causes
High-voltage plug with interlock in loop E pulled or backed out
Loop E wire chafed through to ground
Interlock pin pushed back in its housing
Symptoms
- Abrupt loss of drive power, often with a stop-safely message
- Vehicle cannot be restarted in ready mode
- Charging aborted or impossible
Repair estimate
DifficultyHardWorkshop job
Parts and labour€60–1,200
Time0.5–4 h
Typical range across vehicles; the real cost depends on what the testing finds.
Parts involved
hvil loop ehvil wiring
Related codes
References: law.cornell.edu, ti.com.