Code P0224 indicates an intermittent signal from the 'B' circuit of the throttle position sensor (TPS) or accelerator pedal position sensor (APP). This means the powertrain control module (PCM) has detected erratic, missing, or out-of-range voltage readings from the secondary sensor track, which is used as a cross-check for the primary sensor. The fault is not continuously present, making it a sporadic electrical issue.
The sensor itself has an internal intermittent open or short circuit, often due to wear or contamination of the resistive track. This is the most common cause.
Chafed, broken, or pinched wires in the sensor circuit can cause intermittent open or short circuits, especially when the engine moves or the harness is flexed.
Poor contact at the sensor connector due to corrosion, bent pins, or a loose connection can create an intermittent signal.
Moisture, dirt, or oil ingress into the connector can cause intermittent shorting or high resistance between terminals.
An internal PCM fault is a rare possibility, but can cause intermittent signal processing issues. This should only be considered after all other causes are ruled out.
It is not recommended. The vehicle may enter limp mode, limiting speed and acceleration, and the intermittent fault could become permanent, leaving you stranded.
No. While a faulty sensor is a common cause, wiring issues and poor connections are also frequent. Proper diagnosis is needed to avoid replacing a good sensor.
Clearing the code may temporarily restore normal operation, but the underlying intermittent fault will likely return. It is better to diagnose and repair the root cause.
Almost never. PCM failure is extremely rare for this code. Replacing the PCM without first checking the sensor, wiring, and connectors is a costly mistake and often does not fix the problem.