The P229B: Fuel Pressure Regulator 2 Exceeded Control Limits – Pressure Too High code is triggered when Fuel Pressure Regulator 2 is unable to maintain the expected pressure, causing the fuel pressure to exceed the control limits. This issue can stem from a malfunctioning pressure regulator, blockages, or other issues within the fuel system that cause excessive pressure.
P229B – Quick Overview
Code | Information |
---|---|
Meaning | P229B: Fuel Pressure Regulator 2 Exceeded Control Limits – Pressure Too High |
Is it serious? | Yes, high fuel pressure can lead to over-fueling, increased emissions, poor engine performance, and potential damage to the injectors and engine components. |
Possible causes | – High fuel pressure with regulator 2 – Faulty regulator or fuel system issues – Blockages or faults in the fuel system |
How to diagnose? | – Test fuel pressure regulator 2 – Measure fuel pressure and compare to limits – Inspect the fuel system for faults |
P229B Meaning
The P229B: Fuel Pressure Regulator 2 Exceeded Control Limits – Pressure Too High code indicates that Fuel Pressure Regulator 2 is allowing the fuel pressure to rise above the control limits set by the ECM. This may lead to poor engine performance, excessive fuel consumption, and potential damage to components. The causes could include a malfunctioning pressure regulator, blockages in the fuel lines, or problems with the fuel return system.
Step-by-step diagnostic guide
Action | Description | Tools Needed |
---|---|---|
Check for Other Codes | Use an OBD-II scanner to determine if other related fault codes are present. This will provide additional information on potential issues affecting the fuel system. | OBD-II Scanner |
Measure Fuel Pressure | Use a fuel pressure gauge to measure the actual pressure at Fuel Pressure Regulator 2. Compare these readings with manufacturer specifications to see if the pressure is indeed too high. | Fuel Pressure Gauge |
Test the Fuel Pressure Regulator 2 | Inspect and test Fuel Pressure Regulator 2 using a diagnostic tool. Observe if the regulator can adjust properly and ensure that it is responding to ECM commands as expected. | Diagnostic Tool, Multimeter |
Inspect Fuel Lines for Blockages | Check the fuel lines for any blockages or restrictions. A blocked line can cause a buildup of pressure, leading to excessive fuel pressure at the regulator. | Flashlight, Hand Tools |
Inspect Fuel Return Line | Inspect the fuel return line for obstructions or kinks that could prevent fuel from properly returning to the tank, thereby causing high pressure. | Flashlight, Hand Tools |
Verify Fuel Pump Operation | Ensure the fuel pump is functioning correctly and is not delivering too much pressure. An overactive fuel pump could be causing pressure to exceed control limits. | Diagnostic Tool, Multimeter |
Test Electrical Connections | Inspect the wiring and connections to Fuel Pressure Regulator 2 for signs of damage, loose connections, or corrosion. Faulty electrical connections could affect the regulator’s ability to function correctly. | Flashlight, Multimeter |
Check Fuel Pressure Sensor for Calibration | Test the fuel pressure sensor that provides feedback to the ECM. A faulty sensor could cause the ECM to miscalculate pressure, potentially leading to incorrect adjustments by the regulator. | Diagnostic Tool |
Replace Faulty Components if Necessary | If the pressure regulator, return line, or any other components are identified as faulty, replace them with OEM parts to ensure correct functionality and avoid further issues. | Replacement Parts, Hand Tools |
Clear the Code and Test Drive | After repairs, clear the P229B code using an OBD-II scanner. Perform a test drive, monitoring fuel pressure and system performance to verify that the problem has been corrected. | OBD-II Scanner, Vehicle Owner’s Manual |
Recheck for Codes | After the test drive, re-scan the vehicle to confirm that the P229B code has not returned. If the code persists, further diagnostics focusing on the ECM and other fuel system components may be necessary. | OBD-II Scanner |

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Hi, I am Juraj “Yuri” Lukacko. I got frustrated by unhelpful and scammy mechanics, so I decided to learn everything about car diagnostics myself. I test dozens of new car diagnostic tools every month along with learning new strategies to fix and customize cars. About Juraj Lukacko (Yuri)