P0A8714 Volt Power Module Current Sensor A 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
- This code means the current sensor of the 14 V power module (DC/DC converter, GM: APM) delivers values that are electrically valid but implausible. GM's 2016 eAssist tables (hybrid control processor HPC1) describe a stuck-in-range test: once per key cycle, while the high-voltage contactors are open and then move to precharge, the converter should be off, so the averaged input current must be near zero. If the average is 0.50 A or more, P0A87 sets as a Type B code, so the MIL comes on after two failed trips. The test is skipped while P0A88 or P0A89 is active. Unlike those circuit low/high codes, the wiring is usually intact here; a sensor with offset drift is the typical finding.
- What you may notice
- MIL on after two drive cycles
- Usually no driveability change
- Possible reduced 12 V charging if the converter is limited
- Likely causes
- LikelyCurrent sensor zero-point drift inside the power module
- PossibleConverter actually conducting current when it should be off (internal module fault)
- RareGround or reference fault distorting the sensor signal
- 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: €100 – €1,800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.