Error Code P0553 is defined as Power Steering Pressure Sensor Circuit High Input, meaning there’s a problem with the Power Steering Pressure sensor circuit, likely caused by leaks or loose connections.
This error code is a generic trouble code, meaning it applies to all cars equipped with the power steering pressure system. This includes cars from but not limited to, Chrysler, Dodge, Infiniti, Jeep, Kia, Lexus, Mazda, Nissan, Toyota, etc. As with other generic codes, specifications on the definition, troubleshooting, and repairs for this, vary from one make and model to another.
Before electric and hydraulic-assisted steering wheels were invented, 2017 Ford Fiesta hatchback manufacturers use unassisted rack and pinion steering system. This made steering your cars difficult and inefficient, especially at low speed. Thus, the power steering system was invented.
Generally, a hydraulic-assisted system includes a belt driven power steering pump, box, and various hoses/lines or steering rack, and sensors. The PCM (powertrain control module, also known as ECM or engine control module in other 2017 Ford Fiesta hatchback makes) which acts as the central computer of your 2017 Ford Fiesta hatchback, works alongside with the power steering pressure (PSP) sensor to oversee the pressure within the system and adjust as needed.
Error Code P0553 is set when the PCM determines one or more conditions outside of specific desired range within the PSP sensor circuit. Both the PSP sensor and Steering Angle sensor sends voltage as an input signal to the PCM. The PCM then compares the two, and as long as they are in proportion to each other, there is no problem. When these two input voltage signals are not in accord with each other, then the code will appear, indicating a fault in the system.
Specifically, this code appears when the PCM has detected an electrical value that is HIGHER than the desired input within the circuit. In most cases, this code is a result of electrical problem. But there are times it could be caused by mechanical issue as well.
Other related error codes include:
Before making any diagnosis, make sure you verify and record the integrity of the battery and charging system.
First thing’s first, check the steering fluid level, add when necessary.
Next, check the parking space for any signs of leaks. If there’s any, check further. If the fluid is low, then make sure you check any mechanical leaks before you proceed on with the electronics.
Check the sensor itself, as fluid can leak to the sensor. Make sure the sensor is dry and has no signs of damage, especially leaks.
Note: This system uses high pressure that could potentially be harmful. Pinhole leaks can be really dangerous. If you’re not familiar with the hydraulic system, then you’ll be better off bringing your 2017 Ford Fiesta hatchback to a reputable repair shop.
Test the sensor. Refer to your 2017 Ford Fiesta hatchback service manual for the specifications. The sensor is usually mounted to the power steering pressure line, with hard aluminum or braided rubber lines and accessible under the hood.
Common leaks are found where the rubber meets the hard pressure line, making it difficult to spot the leak.
Find the electrical connector of the pressure sensor. Check for oil residues or soaking signs. If the connector is soaked with oil, then you have a major leak problem. Make sure you clean the oil before reconnecting. A connector showing signs of melting and corrosion must be fixed.
Note: Disconnect the battery before performing any electrical repairs.
Look for signs of physical damage. Usually, for this code, the sensor is exposed to harsh conditions. If the lines are properly fastened, then the sensor must be rubbing on something, which over time could cause an electrical problem of some sort. Make sure to fasten those lines, especially the line with the sensor mounted to it.
You can verify the integrity of the PSP sensor circuit(s). To rule out any problem with your wiring harness, you can disconnect the circuit at the sensor and the PCM. Refer to your 2017 Ford Fiesta hatchback service manual and use your multimeter to verify the right values.
If everything seems to be in good shape up to this point, and the code still persists, then it’s highly recommended that you take your 2017 Ford Fiesta hatchback to your dealer or a reputable repair facility for further advanced and more thorough diagnosis.
Depending on the diagnosis, common repairs for this code include:
The risks of stalling while driving is a serious problem associated with this code. This could present safety hazards and inconvenience. Those who are not experienced in manual steering will also have a hard time driving 2017 Ford Fiesta hatchback with this error code.