18000/P1592/005522 - Altitude Sensor / Boost Pressure Sensor: Implausible Correlation
Possible Symptoms

Malfunction Indicator Light (MIL) active
Limp Mode active

Possible Causes

Ground Spots corroded
Wiring from/to Boost Pressure Sensor (G31) faulty
Boost Pressure Sensor (G31) faulty

Possible Solutions

Check/Clean Ground Spots
Check/Replace Wiring from/to Boost Pressure Sensor (G31)
Check/Replace Boost Pressure Sensor (G31)

Special Notes

When found in 2.0l TDI-PPD, check for matching TSB/TPI (i.e. VW TPI 2012601).
Check/Clean Ground Spots
Check/Replace Wiring Harness for Boost Pressure Sensor (G31) and Intakt Air Temperature Sensor (G42)
Check/Update Engine Control Module Software/Firmware


TSB - 2012601
Engine doesn't work, entries 18000, 05522, 08825 or 00665 Release date:
11-Apr-2009
Customer statement / workshop findings
The engine has no performance, the engine warning light is on and the following
entry is logged in the engine control unit:
• 05522 P1592 altitude sender signal/boost pressure sensor - implausible ratio
• 18000 P1592 altitude sender signal/boost pressure sensor - implausible ratio
• 08825 P2279 air leak in intake system
• 00665 P0299 below boot pressure control limit
Technical background
Transfer resistance in the engine wiring loom.
Production change
Gradual introduction of an optimised engine wiring loom
Part number Designation
1KD 971 658
Adapter wiring loom
Proceed as follows:
• Check whether the complaint is present. Switch on the ignition, select the
function 01 self-diagnosis on and check in the measured value block 10 whether
there is a deviation of over 50 mbar in display field 2 and 3.
The measured pressure values depend on the altitude and the weather. Tolerance
range up to an altitude of about 300 m.
If there is an increased deviation, proceed as follows:
Clean earth points
Fit wiring loom (part number 1KD 971 658)
Update the software of the engine control unit