P0230
Throttle/Petal Position Sensor/Switch C Circuit Intermittent
Powertrain Speed/Idle Control Throttle Position Sensor 🟡 Moderate — Fix within a week
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What This Actually Means
In plain language — no jargon

The engine computer detects an intermittent electrical signal from the throttle position sensor (Circuit C), similar to a flickering light switch that randomly loses connection. This causes the ECU to lose confidence in pedal input readings.

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Symptoms You May Notice
3 known symptoms for this code
Check Engine Light (CEL) illuminated
Rough idle or hesitation during acceleration
Engine may stall or lack power intermittently
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ECU monitors the throttle position sensor's voltage signal (typically 0-5V on Circuit C) to determine pedal position. It expects a smooth, continuous voltage change as the driver adjusts the throttle. An intermittent signal—one that drops out, spikes, or becomes erratic—triggers this fault when the signal doesn't match expected acceleration patterns.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Circuit C Voltage 0.5-4.5V (linear sweep with pedal movement) Signal loss, spikes >5V, or inconsistent transitions
Signal Continuity Continuous electrical path with resistance <10 ohms Intermittent dropout or high resistance >1000 ohms
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Throttle pedal connector
Disconnect and reconnect the sensor plug to clean oxidation; reseat fully until it clicks.
2
Wiring harness (Circuit C)
Inspect the wire from sensor to ECU for cracks, pinches, or corrosion; repair or tape damaged sections.
3
Throttle Position Sensor (TPS)
Replace the sensor if wiring and connections are confirmed good and signal remains intermittent.