🔢
P0551 is a low-severity diagnostic code. Reading the freeze-frame data and any paired codes is the fastest way to narrow it down. See top-rated scanners on Amazon ↗
These are statistical causes across ALL vehicles - your exact car may rank differently
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🎯 Top Causes & Probability
55%
#1 - Most Likely
Failed Power Steering Pressure Switch / Sensor
The sensor screws into the high-pressure side of the steering pump or rack. Internal failure is the most common pattern.
🔨 Part
$25-$110
👨🔧 Labor
$50-$160
⚡ DIY Difficulty
Easy
30%
#2 - Check First
Wiring or Connector Damage
Sensor connector sits near oily areas. Power steering fluid leaks contaminate the pins and corrode the connector.
🔨 Part
$10-$45
👨🔧 Labor
$50-$140
⚡ DIY Difficulty
Easy
10%
#3 - Less Common
Low Power Steering Fluid / Air in System
Fluid level low enough to introduce air gives an erratic pressure reading. Top up first and bleed before assuming the sensor is bad.
🔨 Part
$8-$25
👨🔧 Labor
$0-$80
⚡ DIY Difficulty
Easy
🚗 Most Affected Vehicles
🚫 Is It Safe to Drive?
Yes. Steering still works mechanically. The engine may not raise idle when you turn the wheel, which can cause stalling at very low speed.
🔧 Step-by-Step Diagnosis
- Check power steering fluid level - 30 seconds. Low fluid causes false sensor codes.
- Inspect the sensor connector - Look for fluid contamination and corroded pins. Clean and reconnect.
- Test the sensor signal - With a scan tool, watch PSPS while turning the wheel at idle. Should change from low to high as you steer.
- Replace sensor if signal does not change - The sensor is a $25-$80 part on most Hondas.
❓ Frequently Asked Questions
Will P0551 cause stalling?
Sometimes. The PCM raises idle when you turn the wheel hard. Without the signal, idle can sag and stall at parking-lot speeds.
Is P0551 dangerous?
No. Steering still works. The only real risk is stalling at low speed, which is annoying but not unsafe.
Is this a sensor or a switch?
Most Hondas use a pressure switch (on/off). Some Toyotas and others use a variable pressure sensor. The diagnosis is similar.
Does it affect MPG?
Marginally. The idle stays slightly elevated all the time on some vehicles, which can drop MPG by 1%.
Will Honda warranty cover P0551?
Out of warranty on most. Some 2003-2007 Accords had a TSB for chronic P0551 failures.