Limp mode / G31 sensor / wiring (000568 / P0238)

greid

New member
Joined
May 5, 2019
Messages
1
Just posting this here in case anybody else in the future has the same problem and can avoid some of my headaches.

The glow plug warning light started flashing and my car went into limp mode on Wednesday morning. Plugged in VCDS and got:

000568 - Manifold Pressure / Boost Sensor (G31)
P0238 - 000 - Signal too High - Intermittent
Freeze Frame:
Fault Status: 00100000
Fault Priority: 2
Fault Frequency: 1
Reset counter: 255
Mileage: 205201 km
Time Indication: 0
Date: 2052.14.01
Time: 07:34:47

Freeze Frame:
RPM: 1748 /min
Speed: 23.0 km/h
Voltage: 14.14 V
Absolute Pres.: 1009.8 mbar
Absolute Pres.: 2601.0 mbar
Temperature: 9.9°C
Temperature: 23.4°C

I replaced the G31 sensor (about £40 for an aftermarket one from ECP) but the code / warning light persisted. Following Ross-Tech's advice I looked into the wiring and doing some reading it seems this is a common fault on lots of VAG motors due to the routing of the harness from this sensor back to the ECU. So common in fact that VW produce a repair harness for this purpose - the part number is 1KD 971 658 and costs £36.18 inc VAT.

This is a 4-wire harness that runs directly from the G31 sensor back to the 94 pin connector on the ECU under the wipers.

I'm not sure what engine code the repair harness is designed for but the pin numbers marked on the wires indicated for the ECU don't match those on my car, which is the CBBB engine code. My pins are as follows:

Brown -> 66
Yellow -> 30
Purple -> 83
Grey/Black -> 17

Replaced the connectors at the ECU with the ones from the wiring harness (you'll need the right tools to disengage the locking pins etc) and problem solved.

Hope this helps someone else. Nice to be able to accelerate again!
 

Keithuk

Super Moderator
Staff member
Joined
Jun 4, 2012
Messages
18,939
Location
Stoke on Trent UK
First posts normally go in introductions else you could get a free fix and we never see you again!!!

You made 2 post with the same text I've deleted the other one.

VAG Error Code: 16622/15984/000568/4166/5169/7295
EOBD II Error Code: P0238

Fault Location:
Manifold Pressure/Boost Sensor (G31) - Signal too High

Possible Cause:
Malfunction Indicator Lamp (MIL)(K83) active.

Wiring/Connector(s).
Manifold Pressure/Boost Sensor (G31) faulty.

Possible Solutions:
Check/Replace all faulty Wiring/Connector(s).
Read Measuring Value Blocks (MVB).
Check Manifold Pressure/Boost Sensor (G31).
Signal voltage > 4.88 V.


As taken from my new EOBD II Fault Codes Software
 

Shubz

New member
Joined
Aug 19, 2021
Messages
1
Location
Leeds
Just posting this here in case anybody else in the future has the same problem and can avoid some of my headaches.

The glow plug warning light started flashing and my car went into limp mode on Wednesday morning. Plugged in VCDS and got:

000568 - Manifold Pressure / Boost Sensor (G31)
P0238 - 000 - Signal too High - Intermittent
Freeze Frame:
Fault Status: 00100000
Fault Priority: 2
Fault Frequency: 1
Reset counter: 255
Mileage: 205201 km
Time Indication: 0
Date: 2052.14.01
Time: 07:34:47

Freeze Frame:
RPM: 1748 /min
Speed: 23.0 km/h
Voltage: 14.14 V
Absolute Pres.: 1009.8 mbar
Absolute Pres.: 2601.0 mbar
Temperature: 9.9°C
Temperature: 23.4°C

I replaced the G31 sensor (about £40 for an aftermarket one from ECP) but the code / warning light persisted. Following Ross-Tech's advice I looked into the wiring and doing some reading it seems this is a common fault on lots of VAG motors due to the routing of the harness from this sensor back to the ECU. So common in fact that VW produce a repair harness for this purpose - the part number is 1KD 971 658 and costs £36.18 inc VAT.

This is a 4-wire harness that runs directly from the G31 sensor back to the 94 pin connector on the ECU under the wipers.

I'm not sure what engine code the repair harness is designed for but the pin numbers marked on the wires indicated for the ECU don't match those on my car, which is the CBBB engine code. My pins are as follows:

Brown -> 66
Yellow -> 30
Purple -> 83
Grey/Black -> 17

Replaced the connectors at the ECU with the ones from the wiring harness (you'll need the right tools to disengage the locking pins etc) and problem solved.

Hope this helps someone else. Nice to be able to accelerate again!
Hi. I'm having slingshot similar issues with a 2.0 tdi passat. Had the sensor replaced and no luck. Where did you get the work done? Anyone here fancy replacing the wires on this for me?
 
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