U043E: Invalid Data Received From Vacuum Sensor A
Standardized SAE J2012 code · U04xx — Invalid data received
What does U043E mean?
A receiving module detected implausible data from vacuum sensor A (typically brake booster vacuum). Pressure values fail plausibility checks against engine load and are rejected.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Common causes
- High Module internal fault or sensor input drift
- Medium Software version mismatch after replacement
- Low Gateway module routing CAN messages incorrectly
Likelihood is a general estimate across vehicles; your make and model may differ.
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U043E in the community
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