Bobcat D7571 (75-71) Fault Code: Battery Voltage Out of Range Low
Also shown on the panel as 75-71 · Also called Battery Voltage Out Of Range Low, Drive Battery Voltage Out of Range Low
Battery Voltage Out of Range Low · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
D7571 sets when the Bobcat drive controller sees less than 9.1 volts on the unswitched battery power supply while the key switch is in run/enter. When it sets, drive functions are disabled. It shows on the panel as 75-71 and is self resetting once voltage returns to normal.
High severity. Drive functions are disabled the moment this code sets, which can leave the machine unable to move. It is not an immediate engine or fire hazard, but a machine that loses drive unexpectedly on a slope, near traffic, or on a jobsite hazard is a real safety concern, so treat it as stop-soon rather than ignore-it.
What does Bobcat error code D7571 mean?
D7571 is a low-voltage fault on the machine's main unswitched battery feed, the power that goes to the drive controller directly off the battery rather than through the key switch. When that voltage drops below 9.1 volts while the key is on, the controller assumes it can't reliably run the drive system and shuts drive functions off as a protective measure.
This is fundamentally an electrical supply problem, not a drive motor or hydraulic pump problem. The controller itself is healthy enough to detect the fault and report it, but something upstream, whether it's the battery, the alternator, a fuse, a wire, or a corroded connector, isn't delivering steady power.
Because the code disables drive, operators may notice the machine simply won't travel even though other systems seem to respond. This is the controller protecting itself and the machine, not a random glitch.
What triggers a Bobcat D7571 code?
The drive controller sets D7571 when it measures less than 9.1 volts on the unswitched battery supply while the key switch is in the run/enter position. The code is self resetting once the voltage condition clears.
Common causes of D7571
- A blown or failing fuse feeding the drive controller. Depending on model and harness revision this is referred to as FC1 fuse 4, FRC1 fuse 6, or Fuse 10.
- Supply wire 1250 or 1260 shorted to ground or open, cutting or reducing the power reaching the controller.
- Ground wire 2470 or 2490 open, which can cause voltage readings to be unstable or low even if the battery itself is fine.
- A weak, discharged, or failing battery unable to hold voltage under load.
- A failing alternator not keeping the battery charged during operation.
- A fault inside the drive controller itself.
- Moisture, corrosion, or pushed-back pins in the drive controller connectors, alternator connector, main frame harness, or SJC harness connectors.
- Intermittent wiring or connection issues that aren't present at the time of testing, which can include loose connections, corrosion, pushed-back pins, the controller, the wire harness, or a combination of these problems.
How to troubleshoot Bobcat D7571: first checks
- Check the battery terminals and cables for corrosion, looseness, or damage, and confirm the battery holds a solid charge under load.
- Inspect the relevant fuse (FC1 fuse 4, FRC1 fuse 6, or Fuse 10 depending on model) for continuity and proper seating in its holder.
- Trace supply wire 1250 and 1260 for chafing, shorts to ground, or open circuits between the battery and the drive controller.
- Check ground wire 2470 and 2490 for a clean, tight connection; a poor ground can mimic a low-voltage fault.
- Inspect the drive controller connector, alternator connector, main frame harness connectors, and SJC harness connectors for moisture, corrosion, or pins that have pushed back out of their sockets.
- With the key on, verify actual voltage at the drive controller's unswitched supply and compare against the 9.1 volt threshold; note whether the reading is steady or drops intermittently.
- If the fault isn't present during testing, treat it as intermittent and focus on loose connections, corrosion, and pushed-back pins as the most likely repeat offenders.
How the code clears
D7571 is self resetting. Once the unswitched battery supply voltage rises back above the low threshold and stays stable, the controller clears the code on its own and restores drive functions. No separate clearing step, reset procedure, or scan tool command is listed for this code.
Affected models and serial ranges
D7571 appears in our records across 16 Bobcat models. Match your machine by model and serial number.
| Model | Serial ranges |
|---|---|
| S510 | SN A3NJ11001-99999, SN A3NK11001-99999, SN ATZC11001-ATZC99999 |
| S530 | SN A7TV11001-99999, SN ATZD11001-99999 |
| S550 | SN A3NK11001-A3NL99999, SN A3NM11001-99999 |
| S570 | SN A7U711001-799999, SN A7U811001-899999 |
| S590 | SN ANMN11001-99999, SN ANMP11001-99999 |
| S630 | SN A3NT12370-99999, SN A3NU11001-11111, SN A3NU11112-99999 |
| S650 | SN A3NV11001-13098, SN A3NV13099-99999, SN A3NW11001-11248 |
| S750 | SN A3P211001-299999 |
| S770 | SN A39511001-99999, SN A3P411001-99999 |
| T550 | SN A7UJ11001-AJZV12276 |
| T590 | SN ALJU11001-999999, SN B37811001-999999, SN B3Z711001-999999 |
| T630 | SN A7PU11001-11663, SN A7PU11664-99999 |
| T650 | SN A3P012214-099999, SN A3P111242-199999 |
| T750 | SN ANKA11001-A99999 |
| T770 | SN A3P811001-899999, SN A3P911001-999999 |
| T870 | SN A3PG11001-99999, SN A3PH11001-99999 |
Frequently asked questions
What does Bobcat code D7571 mean?
It means the drive controller detected the unswitched battery power supply dropping below 9.1 volts while the key switch was on. This disables drive functions until voltage is restored.
What is the panel display number for D7571?
On the machine's numeric panel display, this code appears as 75-71.
Why did my Bobcat suddenly lose drive with this code?
The controller disables drive as a protective response any time it sees the unswitched battery supply drop below 9.1 volts. This is intentional, not a random shutdown, and it points to a power supply or wiring issue rather than a drive motor failure.
Do I need a scan tool to clear D7571?
No. The code is self resetting once the voltage problem is corrected and the supply is stable above the threshold. No separate reset procedure is listed.
Which fuse should I check first for D7571?
Depending on the model and harness version, check FC1 fuse 4, FRC1 fuse 6, or Fuse 10. All three names refer to the fuse feeding the drive controller's unswitched supply on different Bobcat harness variants.
Could a bad ground cause this code instead of a bad battery?
Yes. Ground wire 2470 or 2490 being open can cause voltage readings at the controller to read low even if the battery and alternator are otherwise fine, so check grounds along with the battery and supply wiring.
Why does the code come and go instead of staying on?
Intermittent faults are common with this code and are usually tied to loose connections, corrosion, or pushed-back pins in the drive controller, alternator, main frame harness, or SJC harness connectors. If the fault isn't active during testing, focus your inspection there.