U043EInvalid Data Received From Vacuum Sensor A
- Generic OBD-II code · Network
- How the car detects it
- Vacuum sensor A reports the vacuum in a brake booster or vacuum reservoir; U043E is meant for designs in which this sensor sends digital messages and a receiver judges them invalid. No manufacturer documents U043E publicly. GM's usual layout uses an analogue booster vacuum sensor with P-codes: bulletin 17-NA-314 for 2018 Enclave and Traverse traces a Service Power Brake Assist message and brake shudder to wrong readings from a faulty sensor circuit board, setting P0557 and C025E, and 16-NA-366 for 2014-16 Encore links a hard pedal and a constantly running vacuum pump to contamination in sensor, check valve and hose. Comparable effects are plausible with U043E: brake assist warnings, a longer running vacuum pump or start-stop held off. U013D is lost contact; sensor B has U043F.
- What you may notice
- Brake assist warning message
- Hard brake pedal or vacuum pump running often
- Likely causes
- PossibleFaulty sensor electronics giving wrong vacuum values
- PossibleOil or dirt in the sensor, check valve or vacuum hose
- RarePoor terminal tension at the sensor connector
- Repair
- Medium · Usually a job for a workshop.Typical cost: €40 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.