Engine code P0089 "fuel pressure regulator performance"

[thebruce]

Hey guys - I had this code on my 2016 LR4 for months and drove me nuts. The dealer and my indy couldn't figure out if it was the sensor or the low pressure fuel pump in the tank. The dealer replaced the sensor when I got the fuel flange but that didn't solve it. My indy tried updating the software, which was also mentioned as a fix. It was in fact the fuel pump in the tank. I replaced it and fault was gone. I did some junk grit in the bottom of the tank. I suspect some people get this fault after the dealer changes their flange because if they aren't careful they can get a bunch of crud falling in the tank.

I have a write up on replacing the pump. Did it myself. It wasn't fun but with proper instructions you can save yourself $1-2k. Pump was only like $150.

Best option is to have the dealer replace the pump when you get the flange recall service done. It's only like an extra 20 mins of work to replace the pump once the tank is out.

 

[NordicLR4dude]

The 2010–2016 Land Rover LR4 fuel tank flange recall (NHTSA 21V635) can trigger code P0089 (low fuel pressure) if the fuel pump, seal, or flange is damaged or improperly reinstalled during the repair. While intended to fix leaking flanges, this repair can lead to subsequent pump failure, requiring careful inspection of the flange seal and connector. [1, 2, 3, 4, 5]
Key Details on the Recall and P0089 Issue:

• Recall Scope: Covers 2010–2016 LR4 and 2010–2013 Range Rover Sport to fix a cracked fuel outlet flange that can leak fuel.
• Triggering P0089: The code, which indicates a low fuel pressure issue, often appears after the recall because the fuel pump or its associated electrical connector is damaged, or the new gasket fails, during the labor-intensive replacement process.
• Common Causes of Faults:
  • Faulty Seal: A misaligned or damaged seal during the flange replacement can cause fuel odor or pressure issues.
  • Weak Pump: The fuel pump may have been on the brink of failure, and the disruption during the recall repair causes it to fail completely.
  • Software/Module Issue: The P0089-64 code can be caused by a PCM software error, or a faulty fuel pump driver module, particularly if the filter was replaced during the recall, changing fuel pressures.
• Advice: If you experience this issue, check if the fuel pump gasket/seal was properly installed, as reported by other owners who had to return to the dealer. The repair is covered, so owners who paid for the fix out-of-pocket can apply for a