P0E97DC/DC Converter Voltage Sensor C Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P0E97 is the plausibility code for the third voltage channel of a DC/DC converter: sensor C delivers an electrically valid value that does not agree with what the controller expects. Two makers document it. Audi names P0E9700 for the 2020-2021 Q5 and 2021 A7 plug-in hybrids, stored now and then by the J841 electronics of the electric drive, with symptom code 45146; the revised bulletin explains that the software ignored the tolerance of two capacitors, so the ratio between capacity A and B fell outside its limit, and new software (version 0102) cures it. Mercedes-Benz lists P0E9700 for the converter of the EQB and the G-Class after a faulty wake-up of that unit. Hard faults of sensor C are P0E96, P0E98 and P0E99.
- What you may notice
- MIL on, often without a noticeable driving fault
- 12 V battery or high-voltage warning messages in the cluster
- Fault entry appears sporadically and returns after clearing
- Likely causes
- LikelyConverter or power electronics software with too tight plausibility limits
- PossibleConverter stuck in an error state after an incorrect wake-up
- RareDrifting voltage measurement inside the converter
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €50 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.