Powertrain
generic / SAE
P06A3
Sensor Reference Voltage D Circuit Open
Modern ECUs supply 5 V reference rails to multiple sensors. Reference rail B is open - the ECU loses supply on every sensor connected to it (typically TPS B, MAP, or pressure sensors).
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number6 / A3
Possible causes
- Open in shared reference rail high
- Pin pushed back out of connector body low
- Cracked solder joint inside the module or sensor low
Symptoms
- Check engine light on
- Possible limp mode or no-start
- Multiple follow-up faults across modules
- Reset/relearn may be needed after repair
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 80–400 €
- Estimated time: 0.5–2 h
- Component: sensor reference voltage d
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012