Powertrain, generic

P0E97 DC/DC Converter Voltage Sensor C Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

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.

Likely causes

Converter or power electronics software with too tight plausibility limits
Converter stuck in an error state after an incorrect wake-up
Drifting voltage measurement inside the converter

Symptoms

  • 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

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€50–1,500
Time0.3–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

dcdc voltage sensor cdcdc converterhybrid control module

Related codes

P0E96P0E98P0E99P0E9AP0E32P0E37

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.