P0A86 code meaning
14 Volt Power Module Current Sensor A Circuit
Powertrain system Generic code P0Axx codes Check engine light
What P0A86 means
The 14 volt power module is the DC/DC converter that feeds the 12 V network of a hybrid or electric vehicle from the high-voltage battery; GM calls it the Accessory Power Module (APM). Current sensor A measures the current flowing through this converter. P0A86 is the general circuit code for that sensor, used when the controller recognises a fault in the sensor circuit without classifying it as low, high, implausible or intermittent (P0A87 to P0A8A). No manufacturer documents this code publicly; GM's published tables for the same APM input sensor use only the low/high codes P0A88 and P0A89. With an untrustworthy current reading the hybrid controller may limit or switch off the converter, so the 12 V battery can run down over time.
P0A86 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 P0A86
- Hybrid or charging system warning lamp on
- 12 V battery discharges, low-voltage warnings
- Possibly no other noticeable change in driving
Common causes of P0A86
- Most likelyCurrent sensor inside the 14 V power module faulty (usually not replaceable separately)
- PossibleDamaged wiring or corroded connector between module and hybrid controller
- Less likelySoftware fault in the module or hybrid controller
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 P0A86 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. |
| 86 | The exact fault in that area. |
What to do next
- Note P0A86 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 P0A86
What does P0A86 mean?
P0A86 means "14 Volt Power Module Current Sensor A Circuit". The 14 volt power module is the DC/DC converter that feeds the 12 V network of a hybrid or electric vehicle from the high-voltage battery; GM calls it the Accessory Power Module (APM). It is a generic code, so it means the same on every make.
Is it safe to drive with P0A86?
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 P0A86 fail an emissions test?
Yes, it can. P0A86 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 P0A86 to fix?
Difficulty: workshop only. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will P0A86 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.