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HardCharger



Member Since: 03 Mar 2013
Location: Manila
Posts: 803
Philippines 2011 Defender 110 Puma 2.4 SW Stornoway Grey
Erratic Signal Front Left Wheel Speed Sensor
Hi All!

After my truck rebuild, I've been driving him around and every now and then ABS would kick in when stopping and sometimes traction control will also kick in if I applied some throttle when in first gear. Last Saturday, both the ABS & TC light came on but the truck drove normally and had no issues / dramas. After a while, the lights went off and the ABS & TC started doing their thing again.

I plugged in my GAP IIDTool BT when I got home and it give me the Fault ABS-Brake Module, C0031-2F (A8 ) Front Left Wheel Speed Sensor - General Signal Failure - Signal is Erratic.

My mechanic sais to bu a new wheel speed sensor. He also said that while we were at it, I should buy two so we can preemptively change out the right front wheel speed sensor as well. I'm about to order them but would still like to know what all y'all think. Thanks in advance! Thumbs Up No Better Friend, No Worse Enemy
Post #1075889 22nd Sep 2025 8:30am
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Johan_B



Member Since: 20 Sep 2024
Location: Gothenburg
Posts: 145
Sweden 2007 Defender 110 Puma 2.4 CSW Tonga Green
I would only change the left sensor. I see no point in changing the right one.

Since the problems started after a rebuild, could it be that the sensor is not sufficiently inserted?
Post #1075895 22nd Sep 2025 9:21am
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HardCharger



Member Since: 03 Mar 2013
Location: Manila
Posts: 803
Philippines 2011 Defender 110 Puma 2.4 SW Stornoway Grey
Hi Johan_B,

We figured the other sensor might miss his buddy and decide to pack up as well Rolling with laughter

Will have them check about the insertion of the sensor, but just to be on the safe side I already ordered the parts. On the bright side, the front sensors will now be new and I have a spare for just in case. Thumbs Up

Now I just hope the rear sensors play along and not give me problems until maybe the next rebuild some 20 to 30 years down the line Mr. Green No Better Friend, No Worse Enemy
Post #1075951 23rd Sep 2025 1:31am
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MR_JAMES



Member Since: 10 Oct 2013
Location: ESSEX
Posts: 265
United Kingdom 2011 Defender 90 Puma 2.4 XS CSW Stornoway Grey
I had a similar problem after i changed my brake pads, discs and front left stub axle. Checking the speed sensor reading in my diagnostic machine pointed to the front left wheel not matching the other wheel speeds. I bought a new sensor but it turned out that the original sensor needed pushing back down into the hub a little bit. 1953 80"
1987 mini city e
2011 90"
Post #1076002 23rd Sep 2025 7:00pm
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HardCharger



Member Since: 03 Mar 2013
Location: Manila
Posts: 803
Philippines 2011 Defender 110 Puma 2.4 SW Stornoway Grey
Hi Mr_James,

Thank you for that!

Now, is this a simple matter of loosening a nut, pushing sensor further in, retighten nut and done? The parts I ordered are supposedly going to arrive by end of day tomorrow but I can't get a schedule with my mechanic until some time Wednesday next week so I thought to try and do the simple thing first and see if that solves the problem. I'm also afraid that if I wait too long, the problem may give birth to other problems and that's the last thing I need right now. No Better Friend, No Worse Enemy
Post #1076030 24th Sep 2025 3:30am
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Screbble



Member Since: 26 Apr 2015
Location: Lancashire
Posts: 2302
United Kingdom 2004 Defender 90 Td5 XS CSW Zambezi Silver
They are ‘push’ in Thumbs Up
Post #1076044 24th Sep 2025 7:46am
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Johan_B



Member Since: 20 Sep 2024
Location: Gothenburg
Posts: 145
Sweden 2007 Defender 110 Puma 2.4 CSW Tonga Green
If I remember correct you just push the sensor in, no screws holding it in place. The advice I received was to push it all the way in until it couldn't go any further, and then gently turn the hub which would cause the pulse ring on the CV joint to push the sensor out if there was interference.
Post #1076051 24th Sep 2025 9:16am
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HardCharger



Member Since: 03 Mar 2013
Location: Manila
Posts: 803
Philippines 2011 Defender 110 Puma 2.4 SW Stornoway Grey
Hi Johan_B & Screbble,

Thank you for the advice.

I actually tried to push them in yesterday but didn't really have the leverage position so it didn't budge. Whistle Will try again probably on Saturday when I have a bit more time and help to try and sort it. Thumbs Up No Better Friend, No Worse Enemy
Post #1076123 25th Sep 2025 4:33am
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