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2016 Range Rover Sport Supercharged 86K miles. (Out of Warranty) is showing the following Code: PCM-Engine Petrol V6

P0089-64 (E8) Fuel Pressure Regulator 1 Performance -Algorithm based failure-signal plausibilty failure.



What is the real cause of this code?


Is it the Fuel Pump?

OR the Low Pressure and/or High Presure sensor(s)?

Software Update?

How to update the software using GAP Diagnostic?
 

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Discussion Starter #2
The Check Engine Light disappeared for a day and a half and returned today. I overfilled the tank and it went away. When I hit 75%, the Check Engine Light reappears.
 

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2016 Range Rover Sport Supercharged 86K miles. (Out of Warranty) is showing the following Code: PCM-Engine Petrol V6

P0089-64 (E8) Fuel Pressure Regulator 1 Performance -Algorithm based failure-signal plausibilty failure.



What is the real cause of this code?


Is it the Fuel Pump?

OR the Low Pressure and/or High Presure sensor(s)?

Software Update?

How to update the software using GAP Diagnostic?

P0089-64Fuel Pressure Regulator 1 Performance - Signal plausibility failureNOTES:

  • Monitor description. The command signal to the fuel pump driver module is above a threshold
  • This DTC is set when the powertrain control module has detected plausibility failures.


  • Fuel system leakage from the fuel tank and lines
  • Low pressure fuel pump failure

  • Check for fuel system leakage from the fuel tank and lines both internal and external of the fuel tank
  • Using the Jaguar Land Rover approved diagnostic equipment, clear the DTCs and retest
  • Check and install a new low pressure fuel pump as required
 
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bill2019
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