Hi all, brand new here and decided to post after researching several codes on a 2006 Range Rover Sport I was looking into purchasing. We already own one Range Rover Sport but are still new to Land Rovers. We love our sport so much that we decided to get a second used one for me as my wife drives our other one. We found one we really liked at a BMW dealership of all places. Before we made the 1.5 hr trip to view it the dealer called to say that the suspension in the rear was down and was making a dragging sound and the car was being sold as is. I asked him to put the car in off road mode and raise it to see if it would raise. After walking him through how to do it he said the following: System Fault Special Programs Unavailable, When I tried to check for faults, I got HDC Fault, here are some codes that came up, P0441, P0101, P0442, U0167, P0633, P0620, P0579.
I looked these up for anyone else out there who may be encountering the same problems (found below). I'll provide an update on Tuesday as I will be dialoguing with our Landrover shop to see what the likely cause is before we actually purchase it, currently thinking it could be anything from needing a new battery or alternator, to a compressor (not likely), or scrapping the corrosion off of fuse number 26 next to the battery. Just a few thoughts. Anyone else have these problems? Looking forward to being a regular member and sharing our joys and foibles on this Range Rover journey.
Trouble Code:
System:
Subsystem:
P0441 - (ASE)
Powertrain
Auxiliary Emission Controls
DTC Description: Evaporative Emission (EVAP) System Incorrect Purge Flow
Analysis: The Evaporative Emissions (EVAP) canister pressure did not decrease adequately during a purging cycle or the pressure remained lower than expected once the purge cycle ended. The Powertrain Control Module (PCM) detected no flow or an incorrect flow through the system during the test. The system has then failed the flow test, the Malfunction Indicator Light (MIL) is illuminated, and the P0441 fault code is set.
Process Synopsis:
The vapor pressure sensor and the purge and vent valves are used to test the Evaporative Emissions (EVAP) system for problems. The Valves are alternately opened and closed such that vent valve/canister valve is closed and then opens the switching valve to increase the vacuum on the system. Once the vacuum reaches a preset level as measured by the vapor pressure sensor it closes the switching/purge valve. Time intervals and vapor pressure levels are compared to predetermined values to determine whether the flow through the system meets the levels expected or not.
Likely Causes:
Evaporative Emissions (EVAP) Vapor Lines Clogged, Cracked, Damaged, Disconnected, Loose, or Leaking:
-- Vapor line from Purge Solenoid Valve to Manifold Vacuum Reservoir.
-- Vapor line from Canister Purge Solenoid to Charcoal Canister
-- Vapor line from Charcoal Canister to Check Valve
-- Vapor line from Check Valve to Fuel Vapor Valves
-- Fuel Tank Vapor Lines
Component Leaks:
-- Damaged, Cross threaded, very loosely installed, or missing fuel filler cap => Check Gas Cap, tighten until it clicks
-- After-market Evaporative Emissions (EVAP) hardware, such as fuel filler cap, etc., that do not conform to required specifications
Wrong filler cap, Gas Cap => If the cap has been replaced, it may not be the correct cap for the vehicle.
Evaporative Emissions (EVAP) system component seals leaking:
-- Fuel Tank filler neck or sending unit O-ring leak.
-- Fuel Tank is cracked or damaged such that it is leaking.
-- Fuel Tank overfill check valve is cracked or damaged
-- Canister or Seal Damaged and Leaking
Evaporative Emissions (EVAP), Canister Purge Valve, or Vent Solenoid Valve Issues:
-- Vent or Purge Valve power supply circuit is open (No power reaching circuit from battery) => Check Fuses to Actuator, Ignition, Engine, etc.
-- Vent or Purge Valve solenoid control circuit is open (No power reaching control circuit)
-- Vent or Purge Valve solenoid control circuit is shorten to Electrical Ground (GND), Chassis
-- Vent or Purge Valve solenoid control circuit is shorten to (B+), (Vehicle Power (VPWR) [Battery Voltage])
-- Vent or Purge Solenoid Valve is Damaged or Failing
Vapor Switching Valve (VSV) or Canister Control Valve (CCV) Sensor Issues:
-- Vapor Pressure sensor Damaged or Malfunctioning
-- Vapor Pressure sensor circuit is open (No power reaching control circuit)
-- Vapor Pressure sensor circuit is shorten to Electrical Ground (GND), Chassis
Evaporative Emissions (EVAP) component failure:
-- Canister Purge Valve, solenoid, not opening => Possibly damaged or stuck, and leaks
-- Evaporative Emissions (EVAP) canister purge valve stuck closed, but leaks
-- Evaporative Emissions (EVAP) Vacuum Switch is damaged or malfunctioning
-- Charcoal canister is clogged, or loaded with fuel or moisture.
-- Damaged/Failed Powertrain Control Module (PCM)
Trouble Code: P0442 - (ASE)
System:
Subsystem: Powertrain
Auxiliary Emission Controls
DTC Description: Evaporative Emission (EVAP) System Leak Detected (small leak)
Analysis: The Powertrain Control Module (PCM) monitors the complete Evaporative Emissions (EVAP) control system for presence of a small fuel vapor leak. The system failure occurs when a fuel vapor leak from an opening as small as 0.040 inch (1.016 mm) is detected by the Evaporative Emissions (EVAP) while running a loss monitor test.
This test occurs after the system achieves a proper vacuum, with engine running shortly after cold engine startup, with the Engine Coolant Temperature (ECT) Sensor reading a temperature of less than 90 degrees F, Fahrenheit, (32 degrees C - Centigrade), and with the vehicle at a steady speed. This trouble code occurs when the Powertrain Control Module (PCM) detects a small leak, vacuum decay, in the Evaporative Emissions (EVAP) system. The Malfunction Indicator Light (MIL) is illuminated when this fault code is set.
Process Synopsis:
The evaporative emissions system attempts to completely isolate fuel fumes that come from the fuel tank or any other fuel reservoir that in the past had to be vented to the air to prevent the gasses from building pressure in the air filled cavities above the standing fuel (i.e. air above the fuel in the fuel tank). These systems are completely sealed in newer vehicles to prevent the escape of fuel vapor into the atmosphere.
Likely Causes:
Component Leaks:
-- Damaged, cross-threaded or loosely installed fuel filler cap => Check Gas Cap, tighten until it clicks
-- After-market Evaporative Emissions (EVAP) hardware, such as fuel filler cap, etc., that do not conform to required specifications
Wrong filler cap, Gas Cap => If the cap has been replaced, it may not be the correct cap for the vehicle.
-- Small holes or cuts in fuel vapor hoses or tubes
-- Loose fuel vapor hose and tube connections to Evaporative Emissions (EVAP) system components
-- Fuel Tank is cracked or damaged such that it is leaking.
Evaporative Emissions (EVAP) system component seals leaking:
-- Evaporative Emissions (EVAP) canister purge valve leaking
-- Evaporative Emissions (EVAP) canister vent solenoid leaking
-- Fuel tank pressure sensor leaking
-- Fuel Vapor control valve tube assembly leaking
-- Fuel Vapor Vent valve assembly leaking
-- Fuel filler neck O-ring leak.
Evaporative Emissions (EVAP) component failure:
-- Canister Vent (CV) solenoid stays partially open on closed command (possibly sticking)
-- Fuel Tank pressure sensor is damaged, disconnected, or malfunctioning
-- Fuel Tank pressure sensor circuit is open or shorted to ground
-- Clogged, blocked, or restricted fuel tank vapor lines, or purge valve vapor lines.
-- Charcoal canister is clogged, or loaded with fuel or moisture.
-- Vacuum Switching Valve (VSV) circuit for the Canister Control Valve (CCV) is open or shorted to Ground.
Trouble Code: P0101 - (ASE)
System:
Subsystem: Powertrain
Fuel and Air Metering
DTC Description: Mass or Volume Air Flow A Circuit Range / Performance
Location:
Analysis:
Likely Cause:Flow A Out of Expected Range
Trouble Code: U0167 - (ASE)
System:
Subsystem:Network Communication
Fuel and Air Metering
DTC Description: Lost Communication With Vehicle Immobilizer Control Module
Location:
Analysis:
Likely Cause:
Trouble Code: P0633 - (ASE)
System:
Subsystem: Powertrain
Computer and Auxiliary Output Circuits
DTC Description: Immobilizer Key Not Programmed Engine Control Module (ECM) / Powertrain Control Module (PCM)
Location:
Analysis:
Likely Cause:
Trouble Code: P0620 - (ASE)
System:
Subsystem: Powertrain
Computer and Auxiliary Output Circuits
DTC Description: Generator Control Circuit
Location:
Analysis:
Likely Cause:
Circuit Issue
Trouble Code: P0579 - (ASE)
System:
Subsystem: Powertrain
Vehicle Speed Control, Idle Controls, and Auxiliary Inputs
DTC Description: Cruise Control Multi - Function Input A Circuit Range / Performance
Location:
Analysis:
Likely Cause:
Out of Expected Range