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Technical Description of OBD-II Trouble Code
The circuit of the power steering pressure sensor is experiencing intermittent issues.
What does that signify?
This generic diagnostic trouble code (DTC) applies to all OBD-II vehicles equipped with a power steering pressure sensor, including vehicles from Infiniti, Nissan, Toyota, Lexus, Mazda, Dodge, Chrysler, Jeep, Kia, etc.
Before the invention of hydraulically and electrically assisted steering systems, manufacturers used an unassisted rack and pinion steering system. This made steering at low speeds extremely difficult and inefficient.
For this reason, the power steering system was invented. Generally, a hydraulically assisted system includes a belt-driven power steering pump, steering rack/box, and various hoses/lines and sensors. The Engine Control Module (ECM) or Powertrain Control Module (PCM) works with the power steering pressure sensor to monitor the pressure within the system and make adjustments accordingly.
The ECM illuminates the check engine light with the code P0554 and associated codes when it detects a condition or conditions outside of the desired range within the circuit of the power steering pressure sensor. Most of the time, this code is triggered by an electrical issue, but mechanical problems could also be the cause.
The code P0554, which indicates an intermittent malfunction within the sensor’s circuit, is one of five related codes: P0550, P0551, P0552, P0553, and P0554.
What is the severity of this DTC?
Given that it is possible for the power steering system to completely fail and still be able to drive the car, the severity of this issue is considered low. However, it is not advisable to ignore the problem for an extended period of time, as it may lead to more costly repairs in the future.
An example of a power steering fluid pressure switch/sensor:
What are some of the symptoms of the code?
Symptoms of a P0554 diagnostic code may include:
What are some of the common causes of the code?
Causes for this code may include:
What are some P0554 troubleshooting steps?
Make sure to check for technical service bulletins (TSBs) for your vehicle. Accessing a known fix can save time and money during the diagnosis process.
Tools
Some of the tools you may need when diagnosing or repairing the power steering circuits and systems include:
Safety Tips
NOTE: ALWAYS verify and record the integrity of your battery and charging system before further troubleshooting.
Basic Step #1
Start with the simplest checks. Verify the power steering fluid level and top up if necessary. Check your parking space for any signs of a leak. If a leak is present, further investigation is required. If the fluid level is low, it indicates a leak that needs to be repaired before proceeding with electrical diagnosis. Inspect the sensor itself for any signs of damage or leaks.
NOTE: These systems operate at high pressures, which can be dangerous. Pinhole leaks are hazardous. If you are not familiar with the dangers of working with hydraulic systems, it is recommended to take your vehicle to a reputable repair facility.
Basic Step #2
To rule out the sensor as the cause, it needs to be tested. Refer to your service manual for the required specifications. The sensor is typically mounted to a power steering pressure line, which can usually be accessed from under the hood.
NOTE: A common leak occurs where the rubber meets the hard pressure line. Sometimes, the rubber separates, causing a difficult-to-find leak.
Basic Tip #3
Inspect the electrical connector on the pressure sensor for any oil residue. If the connector is soaked in oil, it indicates a problem with the leak that needs to be addressed. Clean the oil before reconnecting. If the connector shows signs of melting or corrosion, it must be repaired.
NOTE: Always disconnect the battery before performing any electrical repairs.
Basic Step #4
Check for physical damage. In this case, the sensor is exposed to harsh conditions. If the lines are not properly fastened, the sensor may rub against something and eventually cause an electrical problem. Secure any loose lines, especially the one with the sensor mounted to it.
Basic Step #5
You may be able to verify the integrity of the power steering pressure sensor circuit(s). To eliminate any issues with the wiring harness, disconnect the circuit at the sensor and the ECM. Use a multimeter and refer to your service manual to ensure that all the desired values are within the specified range. If everything appears to be fine up to this point, it is recommended to take the vehicle to a reputable repair facility.
Professional Service
While we always recommend resolving this issue through mechanical means, if that is not possible, we offer the option to permanently delete this specific DTC. All other codes will continue to function. If you are interested in this option, please upload your ECU file to our portal.
