P0A89 code meaning
14 Volt Power Module Current Sensor A Circuit High
Powertrain system Generic code P0Axx codes Check engine light
What P0A89 means
P0A89 is set when the current sensor of the 14 V power module reports more current than the converter can physically carry. GM's eAssist tables show how: in 2013 the APM input current reading had to exceed 22.5 A for 1.5 s while calculated output power was 1.5 kW or less; in 2016 the limit is 45.25 A or more in 200 of 250 samples (about 5 s) with the APM commanded on and 9 to 32 V supply. Both versions classify it Type B, so the MIL lights after the second failing trip. Typical causes are a signal short to voltage or an internal sensor fault. P0A88 is the low counterpart, P0A87 the in-range plausibility test, and the APM output sensor has its own codes (P0C9E/P0C9F).
P0A89 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 P0A89
- MIL and hybrid/charging warning
- Converter output limited, 12 V voltage drops
- Start/stop function may be disabled
Common causes of P0A89
- Most likelySensor signal shorted to supply voltage
- PossibleCurrent sensor in the power module failed
- Less likelyOpen sensor ground pulling the signal high
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 P0A89 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. |
| 89 | The exact fault in that area. |
What to do next
- Note P0A89 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 P0A89
What does P0A89 mean?
P0A89 means "14 Volt Power Module Current Sensor A Circuit High". P0A89 is set when the current sensor of the 14 V power module reports more current than the converter can physically carry. It is a generic code, so it means the same on every make.
Is it safe to drive with P0A89?
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 P0A89 fail an emissions test?
Yes, it can. P0A89 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 P0A89 to fix?
Difficulty: workshop only. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will P0A89 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.