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P0228 is a diagnostic trouble code (DTC) for "Throttle/Pedal Position Sensor/Switch C Circuit High Input". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
Throttle/Pedal Position Sensor/Switch C Circuit High Input
P0228 is a generic OBD-II code which indicates that the throttle/pedal position sensor/switch C circuit has a high input problem causing the sensor input to the engine control module (ECM) to be higher than the expected voltage input compared to the redundant throttle position sensor A, or above specified range.
The ECM detects that the sensor circuit voltage is above the specified range for the sensor
Short 5 volt reference to the signal wire could cause low voltage to the ECM. This can be from external wiring problems, or from an internally shorted sensor
The Check Engine Light and Electronic Throttle Control (ETC) Light will be illuminated
The ECM goes into failure limp home mode; drive complaints may vary depending on manufacturer programming
The throttle is shut completely during stops to prevent excessive RPM’s
The throttle sets to a fixed position during acceleration to limit throttle opening
Uneven idle or jerking during braking, due to the closed throttle position
Limited acceleration due to very poor throttle response, or no response at all, during acceleration
Vehicle speed limited to 32 mph or less
Disabled cruise control
Scans codes and documents the freeze frame data in order to verify the problem
Clears the engine and ETC codes to verify whether the concern comes back
Does a visual check of the wiring and connections to the throttle body sensors for shorting or burned wires, which could cause a short to power
Checks scan data to see if sensor signal voltage is shorted to power, and follows pinpoint testing steps to find the short circuit
Disconnects and checks the sensor resistance to see if sensor short is internal
Follow these simple guidelines to prevent misdiagnosis:
Do a visual check of the wiring to the sensor to make sure they are not shorted in any way
Look for any problems with burnt or cut wiring to the sensor, or corrosion in the connections
Any problems with the throttle sensor cause the limp mode to be activated
The engine will go into limp home mode and systems will be limited, depending on the manufacturer
The vehicle speed will be limited to less than 35 mph
The engine will lack acceleration or have limited acceleration
The engine idle will be low and erratic when coming to a stop
The code P0228 is triggered when the signal getting to the ECM is higher than specified, and can be due to a short in the wire harness between the sensor and the ECM. This code is not used by most manufacturers and approved pinpoint tests should be followed.
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.