Code
P1680
MINI
P — Powertrain
Electronic throttle control monitor level 2/3 - ADC processor fault
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AI status
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Causes
- Faulty electronic throttle body module (internal ADC or processor failure)
- Engine control module (ECM/PCM) internal fault or corrupted firmware
- Damaged wiring harness or connectors between throttle body and engine control module
- Poor or intermittent power supply (battery/charging) or ground to the throttle/ECM
- Water ingress, corrosion or contamination at throttle module or connectors
- Interference or communication faults on vehicle bus (CAN) affecting diagnostics
Symptoms
- Malfunction Indicator Lamp (MIL) or Engine light illuminated
- Reduced engine power / limp-home mode
- Unresponsive or erratic throttle response
- Poor idle, surging, or stalling under load
- Stored related throttle or communication DTCs
What to check
- Read all stored and pending DTCs and freeze frame data with a capable scanner
- Compare accelerator pedal position (APP) vs throttle position (TP) live data
- Inspect throttle body and ECM connectors for corrosion, bent pins, moisture
- Check battery voltage and charging system under load (12.0–14.5 V expected)
- Measure reference voltage (typically ~5 V) and ground at sensor connector
- Perform wiggle test on wiring harness while monitoring live data for dropouts
Signal parameters
- Accelerator pedal position sensor voltages (usually 2 independent sensors) — expect stable, proportional voltages with pedal movement
- Throttle position sensor / throttle angle voltage — smooth, proportional to throttle plate angle
- Reference supply voltage to sensors (~5 V) and ground continuity
- Raw ADC counts or sensor voltage ranges as reported by scan tool (no stuck or out-of-range values)
- CAN bus message integrity and signal presence for throttle/PCM messages
Diagnostic algorithm
- Connect an advanced scan tool, record freeze frame and all related codes; note mileage and conditions.
- Clear codes and attempt to reproduce. If code returns immediately, proceed with electrical checks.
- Visually inspect the throttle body, connectors and harness for damage, corrosion, water ingress or bent pins.
- With ignition ON (engine off), measure reference voltage at throttle/pedal sensor connector and verify proper ground continuity. Do not short circuits.
- Monitor live data: verify APP and TP signals change smoothly and correlate; check for intermittent/dropout during wiggle test of harness.
- Check battery/charging system voltage under load; low or unstable voltage can cause ADC faults.
- If wiring and supply are good, consult OEM service info for known software updates; perform module re-flash or relearn/calibration if available.
- If fault persists and diagnostics point to the throttle module, consider replacing the throttle body assembly or module. Reprogram/teach-in replacement parts per manufacturer procedure.
- If ECU internal failure suspected (multiple internal processor/ADC faults), follow manufacturer guidance — module replacement and programming may be required.
- After repairs, clear codes and verify proper operation under varied driving conditions; confirm no reoccurrence.
Likely causes
- Throttle body control module internal ADC failure
- Corroded or loose connector at throttle body (pin corrosion, bent pins)
- Faulty 5V reference or ground to the throttle/pedal sensors
- Software error requiring module reflash or calibration
- Intermittent wiring short to voltage or ground on sensor signal circuits
Fault status
Status
Electronic throttle control monitor level 2/3 — ADC processor fault detected in throttle control electronics (manufacturer-specific).
Repair difficulty: Hard
Diagnostic time: 1.5-4 hours
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