Power Steering Pressure Sensor/Switch Range/Performance
The P0551 code means the vehicle's onboard diagnostic system has detected: Power Steering Pressure Sensor/Switch Range/Performance. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- $60 - $250 (parts and labor)
Best-selling code reader on Amazon. Reads and clears check engine codes on any 1996+ vehicle. Under $30.
Essential for diagnosing sensor codes, checking voltage, and testing circuits. Under $15 and pays for itself on the first job.
Affiliate links — we earn a commission at no extra cost to you.
What Are the Symptoms of P0551?
- Engine idle fluctuates when turning steering wheel
- Occasional stalling during parking maneuvers
- Idle speed compensation not matching steering load
- Power steering feels inconsistent
- Check engine light on
What Causes P0551? (Most Likely First)
- PSP sensor giving inaccurate or out-of-range readings Very High
- Intermittent connection at PSP sensor connector High
- Power steering system issue affecting pressure readings Moderate
- Air in power steering system causing pressure fluctuations Moderate
- Worn power steering pump producing inconsistent pressure Low
Can I Still Drive with P0551?
Yes, but fix soon. P0551 is rated low severity. It is not an immediate stop-driving fault, but it will not clear itself — book the repair rather than ignoring the light.
Frequently Asked Questions
Can I drive with code P0551?
Yes, you can drive. The engine may occasionally stumble or stall during parking maneuvers. Be prepared to feather the gas pedal when turning the wheel at low speeds to prevent stalling.
What does range/performance mean for the PSP sensor?
It means the PCM is receiving readings from the PSP sensor that do not match expected values for current driving conditions. The sensor may be reading pressure that does not correlate with steering wheel position or engine load.
Can air in the power steering system cause this code?
Yes. Air in the hydraulic power steering system causes pressure fluctuations and foamy fluid, which can produce erratic PSP sensor readings. Bleed the system by turning the wheel lock to lock multiple times with the engine running and the fluid reservoir cap off.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P0551?
-
Monitor PSP sensor reading with scan tool while turning wheel -- should change smoothly with steering input
-
Compare PSP reading at rest versus full lock -- should show clear pressure increase
-
Check power steering fluid for air bubbles (foamy fluid indicates air in system)
-
Bleed power steering system by turning wheel lock to lock 10-15 times with engine running
-
Replace PSP sensor if readings are erratic or do not correlate with steering input
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
Which Vehicles Commonly Get P0551?
- 2006-2015 Honda Civic
- 2007-2016 Nissan Sentra
- 2005-2014 Ford Focus
- 2008-2017 Chevrolet Cruze
- 2004-2013 Toyota Corolla
Explore More
Was this helpful?
Send this to whoever is fixing the car — your mechanic, or the person asking what the light means.