What Does P0230 Mean?
The throttle/pedal position sensor/switch C circuit is providing an intermittent signal. This is the third redundant sensor in the electronic throttle control (drive-by-wire) system. The ECM uses multiple TPS/APP sensors for safety cross-checking, and intermittent readings from sensor C compromise this redundancy. The driver may experience momentary hesitation, reduced power mode activation, or a brief throttle response lag.
Common Causes
30%
Worn or dirty throttle position sensor C with intermittent contact on the resistive element
25%
Loose or corroded connector at the throttle body or accelerator pedal position sensor
20%
Intermittent wiring fault in the TPS/APP C signal circuit
15%
Accelerator pedal position sensor assembly wearing internally
10%
ECM connector issue or internal circuit fault
Diagnostic Steps
1
Monitor the TPS C and APP C PIDs in live data while slowly sweeping the throttle from closed to wide open. Look for any dropouts, spikes, or dead spots in the voltage trace.
2
Compare TPS C voltage to TPS A and TPS B at multiple throttle positions — they should track proportionally (some are inverse). Any deviation in C indicates the fault location.
3
Perform a wiggle test on the throttle body connector and accelerator pedal connector while monitoring the TPS C PID — a sudden change pinpoints the intermittent connection.
4
Inspect the throttle body bore for carbon buildup that could interfere with smooth throttle plate operation, causing erratic sensor readings.
5
If the APP (accelerator pedal) is the C sensor, check the pedal pivot and sensor mounting for looseness. A worn pedal assembly can cause intermittent sensor contact.
6
Measure the 5V reference voltage at the sensor connector — it should be rock-steady at 4.9–5.1V with no fluctuation during the wiggle test.
Estimated Repair Cost
$100 - $500
Parts + labor, varies by vehicle and location
The throttle/pedal position sensor/switch C circuit is providing an intermittent signal. This is the third redundant sensor in the electronic throttle control (drive-by-wire) system. The ECM uses multiple TPS/APP sensors for safety cross-checking, and intermittent readings from sensor C compromise t...
The most common cause of P0230 (Throttle/Petal Position Sensor/Switch C Circuit Intermittent) is: Worn or dirty throttle position sensor C with intermittent contact on the resistive element
Typical repair costs for P0230 range from $100 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Take seriously. The electronic throttle control system is safety-critical. While the redundant sensors provide backup, an intermittent sensor C reduces the safety margin. The ECM may enter reduced power mode. Do not ignore — diagnose promptly as throttle control faults can progress to a no-drive condition.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0230 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Electronic Throttle Control
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
