P0795 on 2013-2015 Land Rover Range Rover Evoque: Software Fixes and Causes

What's Unique About the 2013-2015 Land Rover RANGE ROVER EVOQUE

The 2014-2015 Evoque was one of the early adopters of the ZF 9-speed (9HP48) automatic transmission. Like many new complex components, it experienced some initial 'teething problems'. Owners reported a range of issues from rough shifting to unexpected faults. In response, Land Rover released several software updates to the Transmission Control Module (TCM) to improve shift quality and resolve false diagnostic codes like P0795. Therefore, a software check is the critical first step for this code, which is different from many other vehicles where P0795 points directly to a failed solenoid.

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 or transmission warning light illumination
• "Gearbox Fault" message on the instrument cluster
• Harsh, erratic, or delayed shifting
• Transmission slipping or feeling like it's not holding a gear
• Vehicle entering 'limp mode' with limited power and gear selection
• Transmission overheating
• Vehicle won't move when placed in gear

Most Likely Causes

1. Transmission Control Module (TCM) Software Error 🔴 High Probability As documented in Land Rover TSB #SSM72164, early versions of the TCM software for the 9HP48 transmission were prone to flagging false diagnostic codes. The bulletin explicitly lists P0795-04 as being caused by a 'TCM SOFTWARE ERROR'. An earlier version, SSM71994, also confirms this and provides specific software levels to update to, such as 'EJ32-14C337-CAM.vbf' for the GTDi engine.
   How to confirm: A Land Rover dealer or a qualified independent shop with access to JLR's diagnostic system (TOPIx/SDD) can check the vehicle's service history and current software version to see if the TSB software update has been applied.
   Typical fix: Perform a TCM software update (reflash) to the latest version available from Land Rover, as instructed by TSB SSM72164.
   Est. part cost: $0-$0 (Service cost only)
2. Faulty Transmission Internal Wiring Harness 🟡 Medium Probability The ZF 9HP48 transmission family has known issues with internal wiring harnesses, which can cause solenoid circuit faults. While TSB LTB00916NAS5 cited in pass 1 refers to an engine issue, general wiring faults within the transmission are a known cause for solenoid codes. Vibration and heat can cause wires to chafe or connectors to fail.
   How to confirm: This requires accessing the transmission's internal components after ruling out software. Diagnosis involves checking the harness for continuity and physical damage.
   Typical fix: Replace the transmission solenoid valve electrical harness. This is an internal component.
   Est. part cost: $150-$250
3. Low or Dirty Transmission Fluid ⚪ Low Probability All transmissions require clean fluid at the correct level to operate hydraulic circuits. While not specific to the Evoque, this is a universal potential cause for pressure-related transmission codes.
   How to confirm: Check the transmission fluid level and condition. This transmission does not have a traditional dipstick, so it must be checked by a technician from a fill plug on the transmission case, following a specific temperature-dependent procedure. 🎬 See how to properly check and replace transmission fluid.
   Typical fix: Perform a transmission fluid drain and fill, or a full fluid exchange, using the correct specification fluid (ZF-LifeguardFluid 9).
   Est. part cost: $200-$400
4. Failed Pressure Control Solenoid 'C' ⚪ Low Probability While the code points to this part, it's an uncommon cause on this specific vehicle due to the known software issues. However, the solenoid is still an electromechanical part that can fail. A failure is more likely after a software update has been performed and the code still returns.
   How to confirm: After a software update and fluid check, a technician can test the solenoid's electrical resistance and function directly. This requires removing the transmission pan and sometimes the valve body.
   Typical fix: Replace the faulty solenoid. Solenoids are often part of the valve body, which may be replaced as a complete unit.
   Est. part cost: $300-$800 (for valve body assembly)

Rare But Worth Checking

• Failing Auxiliary Battery: Multiple owner and repair shop reports indicate that a weak auxiliary battery, which supports the stop-start system and stabilizes vehicle electronics, can cause various electronic glitches, including spurious 'Gearbox Fault' messages. The unstable voltage can affect the TCM. This is a relatively inexpensive item to test and replace before proceeding with major transmission diagnostics.

Diagnosis Steps

1. Scan the Transmission Control Module (TCM) for P0795 and any other related codes. Note the specific suffix (e.g., -04).
2. Check and load test both the main and auxiliary batteries. 🎬 Watch: How a new auxiliary battery fixes transmission faults. A weak auxiliary battery is a known cause of spurious electronic faults on this platform.
3. Using the VIN, check with a Land Rover dealer or use a professional diagnostic system (TOPIx) to see if TSB #SSM72164 is open or has been previously completed for the vehicle.
4. If the software update has not been performed, this is the first and most critical step. Have the TCM software reflashed to the latest version.
5. After the update, clear the codes and perform the transmission adaptation procedure if required by the TSB.
6. Perform an extended test drive to see if the code returns.
7. If the code returns, have a technician check the transmission fluid level and condition. This is a sealed unit and requires a specific procedure.
8. If fluid and software are good, proceed with diagnosing the transmission's internal wiring harness and the pressure control solenoid 'C' itself, which involves removing the transmission pan for access.

Parts You'll Likely Need

• TCM Software Update — This is a service, not a physical part. It is the most common and manufacturer-prescribed fix for this code on this vehicle, as per Land Rover's own technical bulletins.
  Trusted brands: Land Rover Dealer Service
  OEM price range: $150-$350
  Aftermarket price range: $0
• Transmission Internal Wiring Harness (OEM #68197332AA (aftermarket reference)) — If software and fluid are confirmed good, the internal harness is a likely culprit for an electrical fault before the solenoid itself. It is a known failure point on the 9HP48 family.
  Trusted brands: Mopar/Chrysler (shared part), Aftermarket
  OEM price range: $200-$300
  Aftermarket price range: $150-$200
• Transmission Valve Body Assembly — If a software update does not fix the issue and the solenoid is confirmed to be faulty, it is often replaced as part of the entire valve body assembly.
  Trusted brands: ZF (Original Equipment Manufacturer)
  OEM price range: $600-$900
  Aftermarket price range: $400-$700
• Transmission Fluid (OEM #ZF-LifeguardFluid 9) — Required if any internal transmission work is performed, or as a diagnostic step if the fluid is low or degraded. The 9-speed transmission requires this specific fluid.
  Trusted brands: ZF, Liqui Moly Top Tec ATF 1900
  OEM price range: $30-$50 per liter
  Aftermarket price range: $20-$35 per liter

Related Codes That Often Appear With This One

• P07E3-07 — Listed in TSB #SSM72164 as another code triggered by the same TCM software error.
• P0893-07 — Also listed in TSB #SSM72164 as being related to the same software fault.
• P1758-62 — Mentioned in the August 2015 version of TSB #SSM72164 as part of the group of codes caused by the TCM software issue.

Technical Service Bulletins (TSBs) & Recalls

• SSM72164: Addresses P0795 being caused by a TCM software error on 2014-2015 models with the 9HP48 transmission.
• SSM71994: An earlier version of the bulletin identifying P0795 as a flagged diagnostic code on the 9HP48 transmission.

Platform-Specific Known Issues

• TSB #SSM72164 (August 2015): States that on 2014-2015 Evoque and 2015 Discovery Sport models, codes P0795-04, P07E3-07, P0893-07, P07E0-07, and P1758-62 can be flagged due to a 'TCM SOFTWARE ERROR AND/OR ENGINE TORQUE ISSUE'. The prescribed action is to update the TCM software.
• TSB #SSM71994 (November 2014): An earlier bulletin noting that a small volume of 2014-2015 Evoques were flagging P0795-04, P07E3-07, or P0893-07 due to 'INTERNAL TRANSMISSION DIAGNOSTICS HAVE BEEN TRIGGERED'. The fix is a TCM software update and, if needed, running the transmission adaptation procedure.

Mechanic-Grade Diagnostic Values

• Pressure Control Solenoid Coil Resistance — expected: 1.8–2.2 ohms (for ZF9HP48 specific solenoids). General values for similar solenoids can range from 3.5 to 7 ohms.. Failure: A reading of infinite resistance (open circuit) or near-zero resistance (short circuit) indicates a failed solenoid coil.

Hidden / Shadow Codes Worth Checking

• P0795-04: This is a manufacturer-specific sub-code indicating the P0795 fault. Land Rover TSBs state this is caused by a 'TCM software error and/or engine torque issue'. (see via JLR SDD (Symptom Driven Diagnostics) or a compatible professional-level scan tool.)

Scan Tool Commands That Help

• JLR SDD: Transmission Adaptation Reset / Adaptation Clear — After performing a TCM software update or replacing transmission components. TSB #SSM71994 specifically recommends running this procedure after the software update.
• JLR SDD: Air Path Setup Routine — If P0795 returns after a TCM software update, this can be used to address the potential 'engine torque issue' mentioned in TSB #SSM72164. This routine resets the throttle valve and other air intake components, ensuring correct engine torque calculation, which is a critical input for the TCM.

Wiring & Ground Locations

• Transmission Control Module (TCM) — Located on top of the transmission case, next to the side cover.. The TCM is the source of the software fault and the control signals for the pressure control solenoid. Its connections and ground integrity are critical.
• Main Chassis Ground Point — A bolt on an engine mounting, located on the right-hand side of the engine bay just behind the windscreen washer filler cap.. A poor main ground can cause unstable voltage and unpredictable behavior in electronic modules like the TCM, potentially triggering false fault codes.

Model Year Variations Within This Range

• 2014-2015: These models use the ZF 9HP48 9-speed automatic transmission and are the specific subject of Land Rover TSBs #SSM71994 and #SSM72164 regarding the P0795 software fault. The 2013 model uses a 6-speed automatic and is not affected by this specific issue.