P2100 code meaning
Throttle Actuator A Control Motor Circuit/Open
Powertrain system Generic code P21xx codes Check engine light
What P2100 means
P2100 reports an electrical fault in the drive circuit of the first electronic throttle motor, usually an open line. Ford's 2012 summary uses it for an open circuit or a short to power or ground (no MIL, wrench lamp). GM's 2023 table 23OBDG07 checks the bank 1 H-bridge three ways: open load above 200 kOhm, driver overtemperature and short to ground below 0.5 Ohm, each in one trip. Ford's 2024 summary even uses P2100 as the base code for several throttle faults with failure-type bytes. Ducati reports P2100 for the front-bank throttle motor of its V4. The throttle springs to limp position, so the engine runs with little power. Wrong position is P2101; low/high circuit are P2102/P2103; the B actuator is P210A.
P2100 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2100
- Throttle held in limp position, very low power
- Engine or ETC warning lamp on
- Little or no response to the accelerator pedal
Common causes of P2100
- Most likelyMoisture or corrosion in the throttle body or ECU connector
- PossibleBroken or chafed motor wire between ECU and throttle body
- PossibleOpen winding or worn brushes in the throttle motor
- Less likelyDamaged H-bridge output stage in the engine control unit
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Throttle actuator motorThrottle body wiringECM
What each part of P2100 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 1 | Area: fuel and air metering. |
| 00 | The exact fault in that area. |
What to do next
- Note P2100 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 P2100
What does P2100 mean?
P2100 means "Throttle Actuator A Control Motor Circuit/Open". P2100 reports an electrical fault in the drive circuit of the first electronic throttle motor, usually an open line. It is a generic code, so it means the same on every make.
Is it safe to drive with P2100?
Drive gently and only to a workshop. With P2100 the car can go into limp mode (reduced power) to protect itself.
Will P2100 fail an emissions test?
Yes, it can. P2100 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 P2100 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2100 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.