P0E98 code meaning
DC/DC Converter Voltage Sensor C Circuit Low
Powertrain system Generic code P0Exx codes Check engine light
What P0E98 means
P0E98 is set when the C voltage channel of a DC/DC converter is stuck at the lowest end of its range, typically because the measuring line is grounded or the sensing stage has lost its supply. No manufacturer documents P0E98 publicly. GM's 2025 tables (25OBDG03A) show the matching test on channels A and B of the 12 V stabiliser used for auto-starts: below 1 V in 320 out of 400 readings at a 12.5 ms rate gives P0E33 or P0E38, rated Type B. A third channel would be judged the same way. CARB calls for range monitoring of inputs like this. If the converter output itself is normal on the other channels, the fault lies in the C path. The high counterpart is P0E99.
P0E98 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyHard
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0E98
- MIL on, depending on the manufacturer's rating
- Converter output reduced or switched to a fallback value
- Start-stop or 12 V support may be disabled
Common causes of P0E98
- Most likelySensor C signal line shorted to ground
- PossibleMeasuring stage without supply or with an open signal path
- Less likelyInternal defect in the converter's measuring circuit
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Dcdc voltage sensor cWiring harnessDcdc converter
What each part of P0E98 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 98 | The exact fault in that area. |
What to do next
- Note P0E98 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0E98
What does P0E98 mean?
P0E98 means "DC/DC Converter Voltage Sensor C Circuit Low". P0E98 is set when the C voltage channel of a DC/DC converter is stuck at the lowest end of its range, typically because the measuring line is grounded or the sensing stage has lost its supply. It is a generic code, so it means the same on every make.
Is it safe to drive with P0E98?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P0E98 fail an emissions test?
Yes, it can. P0E98 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0E98 to fix?
Difficulty: hard. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P0E98 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.