P2542 on 2013-2015 Land Rover LR2: Fuel Pressure Sensor Circuit High Causes & Fixes

What's Unique About the 2013-2015 Land Rover LR2

For the 2013-2015 LR2 and its platform-mate, the 2012-2015 Range Rover Evoque, which both use the 2.0L turbocharged four-cylinder (GTDi) engine, this code has a well-documented, non-hardware cause. Land Rover issued Technical Service Bulletin #SSM72531 specifically identifying that a "sub-optimal PCM software calibration" could falsely trigger code P2542, often along with P008A and P008B. This makes a software glitch the primary suspect, a unique situation compared to other vehicles where this code almost always points to a failed sensor or wiring.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle.

Symptoms You May Notice

• Check Engine Light is on
• Rough idle
• Hesitation during acceleration
• Loss of engine power
• Engine may take longer than usual to start (hard start)
• Engine may stall unexpectedly
• Reduced fuel economy

Most Likely Causes

1. Outdated Powertrain Control Module (PCM) Software 🔴 High Probability Land Rover issued TSB #SSM72531 for the 2.0L GTDi engine in the LR2 and Evoque, stating the cause is a 'sub-optimal PCM software calibration'.
   How to confirm: A Land Rover dealer or qualified shop must use a JLR-approved diagnostic tool to check the vehicle's VIN against service campaign Q511. If the campaign is open, the software update is required.
   Typical fix: Update the PCM to the latest software calibration as per the service campaign.
   Est. part cost: $0 (if under campaign)
2. Faulty Low-Pressure Fuel Sensor 🟡 Medium Probability If the software has been updated and the code persists, the sensor itself can fail. A Jaguar Land Rover TSB for a related code (P008B) on the same engine family notes that a faulty sensor can send a constant high voltage signal (approx. 4.75v) with the engine running.
   How to confirm: Using a scan tool, observe the low-pressure fuel sensor voltage (PID: Fuel rail pressure - Low range sensor). A reading stuck near 5.0 volts with the key on, engine off, indicates a fault. Disconnecting the sensor should cause the voltage to drop; if it does, the sensor is bad. If it remains high, the wiring is shorted to power.
   Typical fix: Replace the low-pressure fuel sensor. 🎬 See this walkthrough for repairing the low pressure sensor circuit
   Est. part cost: $50-$150
3. Wiring or Connector Issue ⚪ Low Probability Engine bay heat and vibration can cause wiring to chafe, break, or corrode, creating a short to power that triggers a 'circuit high' code. The sensor is located near the high-pressure fuel pump, an area with significant heat.
   How to confirm: Visually inspect the wiring harness and connector for the low-pressure fuel sensor for damage, melting, or corrosion. Perform a continuity test and check for a short to voltage on the signal wire between the sensor connector and the PCM.
   Typical fix: Repair the damaged wiring or clean/replace the connector.
   Est. part cost: $5-$50

Rare But Worth Checking

• Faulty Powertrain Control Module (PCM): In rare cases, the PCM itself can have an internal fault, causing it to misinterpret the sensor's signal. This should only be considered after all other possibilities (software, sensor, wiring) have been exhaustively ruled out.

Diagnosis Steps

1. Scan the PCM for all stored trouble codes. Note if P008A or P008B are present with P2542, as this strongly points to the TSB.
2. Contact a Land Rover dealer or qualified independent shop with the vehicle's VIN to determine if service campaign Q511 (related to TSB #SSM72531) is open or has already been completed.
3. If the software is not up-to-date, have the PCM reprogrammed. This is the most probable fix and should be done first.
4. If the software is current, proceed with hardware diagnosis. Locate the low-pressure fuel sensor. On the 2.0L GTDi, it is typically on the fuel line leading to the high-pressure fuel pump.
5. With the ignition on (engine off), use a scan tool to read the live data for the low-pressure fuel sensor. A reading near 5.0V indicates a circuit high fault.
6. Disconnect the sensor's electrical connector. If the voltage reading on the scan tool drops (and a 'circuit low' code may appear), the sensor is internally shorted and must be replaced.
7. If the voltage remains high after disconnecting the sensor, there is a short to voltage in the signal wire. Inspect the wiring harness between the sensor and the PCM for damage, chafing, or melting.
8. If wiring and software are confirmed to be good, replace the low-pressure fuel sensor. Be sure to relieve fuel pressure before removal.
9. After any repair, clear the codes and perform a drive cycle to ensure the fault does not return.

Parts You'll Likely Need

• Low-Pressure Fuel Sensor (OEM #LR044707) — If the mandatory software update does not resolve the issue, the sensor itself is the next most likely component to have failed. This part number is associated with the 2.0L engine family.
  Trusted brands: Genuine Land Rover, Bosch (OEM supplier, P/N 0261545077), Motorcraft
  OEM price range: $100-$180
  Aftermarket price range: $45-$120

Related Codes That Often Appear With This One

• P008A — Stands for 'Low Pressure Fuel System Pressure - Too Low'. It is explicitly mentioned in TSB #SSM72531 as being caused by the same software issue.
• P008B — Stands for 'Low Pressure Fuel System Pressure - Too High'. It is also mentioned in TSB #SSM72531 as being caused by the same software calibration problem.

Technical Service Bulletins (TSBs) & Recalls

• SSM72531: Addresses rough idle, hesitation, and loss of power with DTCs P008A, P008B, and/or P2542, identifying the cause as a 'sub-optimal PCM software calibration' for the 2.0L GTDi engine in the LR2 and Range Rover Evoque. It advises checking the status of campaign Q511.
• JTB00413NAS2: While for a Jaguar with the same engine family, this TSB is highly relevant. It details how a failed low-pressure sensor can cause code P008B by sending a constant high voltage (4.1V key on, 4.75V engine running), providing specific diagnostic values.

Platform-Specific Known Issues

• A known software glitch is the primary cause for this code on 2013-2015 models, as documented in Land Rover Technical Service Bulletin SSM72531. Owners often report symptoms like rough idle and hesitation that are resolved with a PCM software update rather than a hardware replacement.
• The issue also affects the Range Rover Evoque (2012-2015) which shares the same 2.0L GTDi engine and PCM software.
🎬 Watch: Fixing the P008B code on a Range Rover Evoque

Mechanic-Grade Diagnostic Values

• Low-Pressure Fuel Sensor Voltage (Phase 1) — expected: ~3.0V (±0.15V). Failure: Readings outside this range during the first 30 seconds after a cold start suggest a fault in the low-pressure fuel system.
• Low-Pressure Fuel Sensor Voltage (Phase 2) — expected: ~2.3V (±0.15V). Failure: After the initial 30 seconds, engine speed should drop and the voltage should settle to this range. Failure to do so points to a fault.
• Low-Pressure Fuel Sensor Signal Voltage (General) — expected: 0.5V to 4.5V. Failure: A voltage reading stuck near 5.0V or at 0V indicates a circuit fault or failed sensor.
• Sensor Connector Reference Voltage — expected: ~5.0V. Failure: Significantly lower or no voltage at the reference pin of the sensor's connector points to a wiring or PCM issue.
• Low-Side Fuel Pressure (Mechanical Gauge) — expected: ~55 PSI. Failure: Pressure significantly above or below this value can indicate a mechanical issue with the pump or regulator, though P2542 is an electrical code.

Scan Tool Commands That Help

• JLR SDD / Pathfinder: Check/Update PCM Software Calibration — This is the mandatory first step for diagnosing P2542 on this vehicle, as per TSB SSM72531, to rule out the known software bug before any hardware is replaced.
• JLR SDD / Pathfinder: Powertrain - High pressure fuel pump test — While not directly for the low-pressure sensor, this function is used in related fuel system diagnostics to command and evaluate fuel pump performance, demonstrating the capabilities of the dealer tool.
• JLR SDD / Pathfinder: Powertrain - Powertrain control module unlock application — This service function may be required after certain software updates or module replacements to enable full functionality.

Wiring & Ground Locations

• Engine Control Module (ECM) — Located at the top center of the firewall in the engine compartment.. The wiring harness for the low-pressure fuel sensor runs from the sensor to the ECM. Knowing the ECM's location is critical for performing continuity tests or checking for damage along the harness path.
• Fuel Pump Driver Module — Located in the left front of the luggage compartment (cargo area).. This module controls the in-tank low-pressure fuel pump based on commands from the ECM. While not a direct cause of a 'circuit high' fault, its location is relevant for comprehensive fuel system diagnosis.

OEM Part Supersession History

• LR044707 (Land Rover) → Not applicable; this is the current number. It cross-references to other manufacturer part numbers. — This part is shared across multiple vehicle brands.
  Heads up: Cross-references include Bosch P/N 0261545077, Jaguar P/N C2Z22844, and Ford engineering P/N DW939G774BA. Ensure the physical connector matches, but these are generally direct replacements.

Model Year Variations Within This Range

• 2013-2015: The primary variation is the introduction of the 2.0L Turbocharged I4 (GTDi) engine for the 2013 model year, replacing the previous 3.2L I6. The TSB SSM72531 and the associated software fault are specific to this 2.0L engine. No significant variations affecting this specific fault have been documented within the 2013-2015 production run.