Manual:LAND ROVER Range Rover Supercharged 2015Page:48915 / 73010



DTC P20E8 - REDUCTANT Pressure Too Low-Signal Above Allowable Range (SSM72610) — 2015 Land Rover Range Rover Supercharged Service Manual

DTC P20E8 - REDUCTANT Pressure Too Low-Signal Above Allowable Range (SSM72610)

WARNING: This page is about the Range Rover Base, which is a different variant/trim than selected.
Publication date: 2016-01-29
Reference number: SSM72610

DTC P20E8 - REDUCTANT PRESSURE TOO LOW-SIGNAL ABOVE ALLOWABLE RANGE

DTC P20E8 - REDUCTANT PRESSURE TOO LOW-SIGNAL ABOVE ALLOWABLE RANGE

TECHNICAL SERVICE BULLETIN

Reference Number(s): SSM72610, Date of Issue:  January 29, 2016
LAND ROVER: Discovery 4/L319; Discovery Sport/L550; Range Rover/L405; Range Rover Evoque/L538; Range Rover Sport/L494
SECTION: Engine

SERVICE INFORMATION

Symptom  403000 Exhaust System Concerns

ISSUE

Customers may report the engine management light (MIL) is illuminated with the possibility of a 'No engine restarts in xxx miles/km, diesel exhaust fluid dosing malfunction"  warning message displayed within the instrument cluster message centre and DTC's P20E8-84/85 and P2BAE/P2BAF stored in the PCM (Powertrain Control Module). 

NOTE: If other codes are stored in the PCM they must be investigated and resolved before following the advice detailed in this SSM.

CAUSE

The system has detected a pressure deviation in the DEF (Diesel Exhaust Fluid) injection system.

ACTION

Issue is most likely to occur during the first 1000miles/1600km but is entirely dependent on drive style and road conditions, so there is a possibility for higher mileage vehicles to experience the concern, particularly where the "No engine restarts in xxx miles/km, diesel exhaust fluid dosing malfunction" message is only present for one driving cycle.

Visually inspect the DEF tank, supply line and dosing module for any leaks/damage or loose electrical connectors, repair any faults identified. Proceed to the routine detailed below once faults have been repaired or if no fault is found.

Please complete the following routine, this will prime, purge and pressure test the DEF/SCR system:

  1. Start SDD session and enter service functions (DVD 143 Patch 3 onwards) 
  2. Under the powertrain section run the 'Diesel exhaust fluid prime and pressure test routine' and the 'Reset selective catalyst reduction quality monitor' 
  3. Once completed successfully, clear the DTC's.
    NOTE: Upon DTC clear, the warning changes to "No engine restarts in xxx miles, diesel exhaust fluid dosing malfunction" also make sure the engine MIL is off (when engine is running).
  4. Complete the following drive cycle making sure the DEF/SCR system monitor conditions are met:
    • Drive the vehicle at 'urban' speeds (<50mph) and light engine load
    • Drive for at least 15 minutes to ensure the exhaust reaches minimum temperature (100degC or 212degF) to trigger DEF/SCR pressure build up. Make sure the exhaust temperature remains under 300degC or 572degF (use data logger if required) 
    • The 'inducement' warning clears automatically once the monitoring has executed. This terminates the driving cycle.
    NOTE: If the engine MIL shows during the driving cycle, the malfunction has re-occurred, this will require further diagnosis on the DEF/SCR system. Please raise a TA for Help Desk and engineering to assist as and when appropriate
  5. Clear Faults/PCodes after the driving cycle, this clears up the DTC's P2BAE/P2BAF