P00FD code meaning
Battery B State of Charge Performance
What P00FD means
'Battery B' here is not a hybrid high-voltage battery (those have codes from P0B27) but, in the only documented use by FCA/Stellantis, the 12 V auxiliary battery of the start-stop system. When the engine restarts automatically, a relay separates main and auxiliary battery so that the auxiliary one keeps the control units stable while the main battery cranks. The engine module sets P00FD if the auxiliary battery is disconnected on the first start, drops below about 8 V during an auto-start, or repeatedly falls below 10.3 V (counter reaches ten). Start-stop is then disabled; often it follows a jump start or many short trips. Whether the MIL comes on is not stated in the sources.
P00FD at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyEasy, DIY possible
- Typical labor0.3 to 1.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P00FD
- Start-stop out of service, 'Service Start/Stop' message
- Engine does not crank once
- 'Service Shifter' message with electronic gear selector
Common causes of P00FD
- Most likelyAuxiliary battery discharged or aged
- Most likelyLoose or corroded positive or ground connections at either battery
- Possible150 A fuse or fuse array in the power distribution centre open or poorly contacting
- Less likelyBattery separation relay stuck
- Less likelyMain battery faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Auxiliary batteryPower control relayBattery cablesFuses
What each part of P00FD means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 0 | Area: fuel and air metering and auxiliary emission controls. |
| FD | The exact fault in that area. |
What to do next
- Note P00FD 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 P00FD
What does P00FD mean?
P00FD means "Battery B State of Charge Performance". 'Battery B' here is not a hybrid high-voltage battery (those have codes from P0B27) but, in the only documented use by FCA/Stellantis, the 12 V auxiliary battery of the start-stop system. It is a generic code, so it means the same on every make.
Is it safe to drive with P00FD?
P00FD does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P00FD fail an emissions test?
P00FD is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P00FD to fix?
Difficulty: easy. A typical repair takes 0.3 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P00FD clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.