Code
P212E
Generic
P — Powertrain
Throttle Position Sensor/Switch G Circuit Intermittent
AI status
Completed
Completed
100%
Causes
- Damaged, corroded or loose wiring/connector at TPS (intermittent open/short)
- Poor or intermittent ground or 5V reference to the TPS
- Faulty throttle position sensor/switch G (internal intermittent)
- Connector contamination, bent pins, or water intrusion
- Intermittent short to battery voltage or to ground in harness
- Faulty ECM (rare) or intermittent ECM connector pin
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Intermittent throttle response, hesitation or surging
- Reduced engine power or limp mode on some vehicles
- Inconsistent idle speed or stalling under certain conditions
- Possible poor acceleration or driveability complaints that come and go
What to check
- Read freeze frame and stored data with a scan tool; record conditions when fault set
- Check live TPS signal on scan tool while slowly opening and closing throttle
- Visually inspect TPS connector and wiring for damage, corrosion, or loose pins
- Perform a wiggle test on harness and connector while monitoring live data for dropouts
- Backprobe signal, 5V reference, and ground with a DVOM or oscilloscope
- Inspect and test related grounds and power feeds for continuity and voltage
Signal parameters
- Reference voltage at TPS: ~5.0 V ±0.25 V (with key on, engine off)
- Signal voltage closed throttle: typically ~0.2–1.0 V (manufacturer-specific)
- Signal voltage at wide open throttle: typically ~4.0–4.8 V
- Signal should change smoothly and monotonically with throttle opening (no spikes/dropouts)
- Signal circuit resistance: open/short check should show continuity to ECM pin per service manual
- Oscilloscope: clean analog ramp with no flat spots, jumps or intermittent loss of signal
Diagnostic algorithm
- Connect a scan tool, read codes, note freeze frame and PID data when fault occurred.
- Monitor TPS G live data while operating throttle slowly. Look for inconsistent readings, sudden drops, or jumps.
- Visually inspect the TPS connector and wiring for chafing, pin corrosion, bent pins, or moisture. Repair any damage.
- Perform a wiggle test: with a helper watching the live PID, wiggle harness and connector to reproduce intermittent behavior.
- Backprobe the sensor: verify reference 5V supply, sensor ground, and signal voltage. Compare to expected signal parameters.
- If signal intermittency persists, use an oscilloscope to observe waveform for glitches or noise. Confirm linear ramp with throttle movement.
- Check continuity and resistance of signal, reference and ground circuits from sensor to ECM. Repair any open or high-resistance circuits.
- If wiring and connectors test good, replace the TPS/switch G with an OEM or equivalent unit and retest.
- If new sensor does not cure the issue, inspect ECM connector and pins for damage and test ECM input circuit per factory procedures.
- Clear codes and perform a thorough road/drive cycle to confirm repair; verify code does not return.
Likely causes
- Wiring harness damage or chafed insulation near moving components (most common)
- Corroded/loose connector pins at the TPS
- Failing TPS with internal intermittent contact
- Poor sensor ground or 5V reference circuit
- Intermittent ECU input circuit (least common)
Fault status
Status
P212E - Throttle Position Sensor/Switch G Circuit Intermittent: Intermittent fault detected in TPS G signal circuit (open/short/dropout).
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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