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Nissan Patrol 2010 P0090 Code: Engine Loss of Power and Diagnosis Steps

Model: nissan Fault Code: P0090 Posted: 2014-10-23 10:39

Hi everyone, I own a 2010 Nissan Patrol and am experiencing engine loss of power with the check engine light illuminated. The diagnostic trouble code displayed is P0090. I'm not familiar with what this code means, so I'd appreciate any guidance on its possible causes and how to resolve it. The vehicle has been checked for fuel pressure issues, and I've already replaced both the fuel pressure regulator and the fuel pump. However, the P0090 code persists without resetting. I'm now considering whether there might be an issue with the engine control module (ECM) or wiring circuits. Could someone please explain what the P0090 code indicates in a 2010 Nissan Patrol? What are the common causes, and is there a step-by-step procedure for diagnosing and fixing this issue?

Related fault codes
P0090
Comments (6)
Anonymous 2014-10-24 11:31

Check the official trouble code reference guide on this forum. The P0090 code typically relates to the fuel pressure regulator circuit, which may explain the engine power loss.

Anonymous 2014-10-29 08:20

I recently replaced both the fuel pressure regulator and fuel pump in my Nissan Patrol. After replacement, the P0090 code remained unchanged. I'm looking for a clear procedure to properly diagnose and resolve this issue—any guidance would be greatly appreciated. Thanks, Tareq Qasem.

Anonymous 2014-10-30 09:00

Verify the fuel regulator control circuit for continuity and proper signal transmission from the fuel pressure regulator to the engine control module (ECM).

Anonymous 2014-10-30 14:27

Thanks for the tip—I've completed the circuit testing. The wiring harness appears intact, with no issues between the regulator and ECM on the three-wire connection. However, after clearing the P0090 code, a new code appeared: P0087. I'm unsure how to proceed with this second issue—any advice would be helpful.

Anonymous 2014-10-31 06:57

Did you replace the fuel pressure regulator from an authorized dealer or after-market supplier? The source may affect compatibility and code behavior.

Anonymous 2014-10-31 07:35

I replaced it with a factory-original unit from the dealership. I'm still seeing the P0090 code even after replacement, which is puzzling. I've confirmed the wiring harness is intact and tested the fuel pump as well. At this point, I’m beginning to suspect an internal ECM issue—but I want confirmation before proceeding further.