P2D97Starter/Generator Phase Z Current Sensor Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2D97 is the last of the three low codes: the Z-phase current sensor of the starter/generator reports a value under the bottom of its valid window. Because the machine both drives the engine and charges, its phase current is signed, so a low fault stands for an impossible negative reading or a collapsed output, not for a weak current. Z is no mere placeholder: Mazda's bulletin 01-004-25 for its integrated starter generator lists the stator driver circuits in a U-V-W group and a separate X-Y-Z group. No manufacturer documents P2D97 publicly. In GM's eAssist analogue the low codes trip below -440 A after roughly 42 ms, Type B. Suspect a grounded signal lead or a lost sensor supply. High side: P2D94; X and Y low: P2D95, P2D96.
- What you may notice
- Warning lamp or MIL, typically after the fault has repeated on a second trip
- Electric boost and recuperation reduced or switched off
- No automatic engine stop, or restarts via the conventional starter
- Likely causes
- LikelyPhase Z sensor signal lead shorted to ground or to the machine housing
- PossibleSensor supply interrupted by an open wire or a pushed-back terminal
- PossiblePhase Z current sensor output stuck at the bottom of its range
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €150 – €2,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.