Code
P2107
HUMMER
P — Powertrain
Throttle Actuator Control (TAC) Module Internal Circuit
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UK: 28
EN: 33
RU: 30
AI status
Completed
Completed
100%
Causes
- Faulty TAC (throttle actuator) module internal electronics
- Corroded/damaged connector or wiring to the TAC module
- Low or unstable battery/charging system voltage during operation
- Water intrusion or contamination inside the throttle body/module
- Intermittent short to power or ground in the actuator circuits
Symptoms
- Check Engine/MIL illuminated
- Reduced engine power / limp-home mode
- Delayed or unresponsive throttle pedal
- Engine may stall or idle poorly
- Stored related throttle/pedal position DTCs (multiple codes)
- Possible audible clicking or abnormal noise from throttle body (rare)
What to check
- Read and record all stored and pending DTCs and freeze frame data with a scan tool
- Check vehicle battery voltage and charging system (engine off and cranking/ignition on)
- Inspect TAC/throttle body connector and harness for corrosion, bent pins, heat damage, water entry, or chafing
- Verify relevant fuses and power/ground circuits at the fusebox and module
- Check for related pedal position sensor codes (compare signals)
- Attempt a key-on self-test / relearn procedure as specified by manufacturer
Signal parameters
- Battery/ignition voltage (Key ON): ~11–14.5 V
- 5 V reference to throttle/pedal sensors: ~4.75–5.25 V
- Throttle position sensor voltages (closed to open): ~0.2–0.9 V (closed) up to ~4.0–5.0 V (wide open) depending on sensor type
- Actuator motor coil resistance: typically low ohms (manufacturer-specific) — expect continuity, not open circuit
- Actuator driver PWM duty cycle: 0–100% (varies with throttle command); frequency typically tens to a few hundred Hz
- Actuator current draw (during movement): small amps; watch for excessive stall current indicating mechanical bind or shorted coil
Diagnostic algorithm
- Retrieve all DTCs and freeze-frame data. Save for reference. Note if P2107 is the only code or appears with other throttle/pedal codes.
- Verify battery and charging system health. Recharge or replace battery if voltage is below specification or unstable.
- Visually inspect TAC/throttle body connector, wiring harness, and grounds for damage, corrosion, water intrusion, pin misalignment, or loose terminals. Repair any issues found.
- Check fuses and power feeds to the TAC module. With ignition ON, verify 12V supply and ground at the module connector using a DVOM.
- Verify 5V reference and sensor ground at the throttle/pedal sensors. Compare sensor voltages to expected idle and wide-open ranges using a scan tool or multimeter.
- With ignition OFF, check continuity/resistance of motor coils and internal actuator circuits per manufacturer values. Look for opens or shorts to ground/power.
- With a lab-quality scope or oscilloscope, observe the actuator control signals (PWM) from the TAC module while commanding throttle input with a scan tool. Look for missing, clipped, or abnormal waveforms.
- Wiggle test harness and connectors while monitoring live data for intermittent faults.
- If harness, power, and grounds test good but fault remains, attempt manufacturer-specified TAC reset/relearn or module reflash using dealer-level scan tool/software.
- If reflash/relearn fails and internal fault persists, replace the TAC/throttle body module assembly. After replacement, perform necessary relearn/calibration procedures and clear codes. Recheck for reappearance.
- If new module fails immediately or codes persist, consider upstream ECU/PCM faults or wiring short between TAC and ECM; perform further diagnosis or consult manufacturer guidance.
Likely causes
- Internal component failure inside the TAC module (failed driver circuitry or sensors)
- Broken or shorted motor coil or control traces inside throttle body
- Poor ground or 5V reference loss to the TAC module
- Damaged connector pins (bent, pushed out, corroded) causing intermittent contact
- Aftermarket or incorrect replacement throttle body/module not configured or incompatible
Fault status
Status
Throttle Actuator Control (TAC) Module Internal Circuit
Repair difficulty: Hard
Diagnostic time: 1.0-3.0 hours
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