P0A88 code meaning
14 Volt Power Module Current Sensor A Circuit Low
Powertrain system Generic code P0Axx codes Check engine light
What P0A88 means
P0A88 reports that the current sensor of the 14 V power module (DC/DC converter feeding the 12 V system) reads too low while the converter should be delivering power. GM documents it for the Accessory Power Module: in the 2013 eAssist tables the input current must stay below 0.5 A for 1.5 s within a 2 s window while calculated output power is 0.25 to 1.5 kW; the 2016 tables use 0.50 A or less in 640 of 800 samples, enabled only when the APM is on, the hood is closed and the 12 V target is reached. Both rate it Type B, two trips to MIL. A short to ground, an open signal line or a dead sensor are typical; P0A89 is the opposite high fault, P0A87 the plausibility check.
P0A88 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor1 to 4 hours
- Clears after repairAfter a drive cycle
Symptoms of P0A88
- MIL and hybrid/charging warning
- 12 V battery not charged properly
- Start/stop function may be disabled
Common causes of P0A88
- Most likelySensor signal shorted to ground or open
- PossibleCurrent sensor in the power module failed
- PossibleCorroded or loose module connector
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Pm14v current sensor aWiring harnessDcdc converter
What each part of P0A88 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| A | Area: hybrid propulsion. |
| 88 | The exact fault in that area. |
What to do next
- Note P0A88 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 P0A88
What does P0A88 mean?
P0A88 means "14 Volt Power Module Current Sensor A Circuit Low". P0A88 reports that the current sensor of the 14 V power module (DC/DC converter feeding the 12 V system) reads too low while the converter should be delivering power. It is a generic code, so it means the same on every make.
Is it safe to drive with P0A88?
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 P0A88 fail an emissions test?
Yes, it can. P0A88 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 P0A88 to fix?
Difficulty: workshop only. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will P0A88 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.