850 ABS good in COLD weather

[fred]

In COLD weather the ABS light stays off. As soon as the weather warms up,
the light comes on. My mechanic ( a bright guy ) says the PCB board is
failing on the ABS ECU, and in cold weather, resistance is lower, hence no
light.
FWIW:
the volvo dealer (!?!) said the code was the right rear wheel sensor (see
bay13) and basically this indicates the ABS ECU rather than the wheel
sensor.
Hello cold weather!

Comments welcome!

 

[Jordan B.]

This is apparently a very common fault on 850s. I've even heard it happens
on S/V70s but I've been lucky so far. In fact if the Toronto weather stays
the way it is now I may not ever need my ABS this winter!!

Jordan 1999 S70 Loaded!

 

[John Horner]

In COLD weather the ABS light stays off. As soon as the weather warms up,
the light comes on. My mechanic ( a bright guy ) says the PCB board is
failing on the ABS ECU, and in cold weather, resistance is lower, hence no
light.
FWIW:
the volvo dealer (!?!) said the code was the right rear wheel sensor (see
bay13) and basically this indicates the ABS ECU rather than the wheel
sensor.
Hello cold weather!

Comments welcome!

It seems that probably every 850 ABS controller is going to fail. The
failure/replacement rate reported on various web sites is through the roof.

Our '96 made it to 90k miles and six years before the thing failed, which
still seems much too soon for a $500 part.

Of course Volvo has done nothing to address the issue except to collect
money for replacement parts.

Apparently Volvo is enjoying collecting our money!

John

 

[Sean Nugent]

In COLD weather the ABS light stays off. As soon as the weather warms up,
the light comes on. My mechanic ( a bright guy ) says the PCB board is
failing on the ABS ECU, and in cold weather, resistance is lower, hence no
light.
FWIW:
the volvo dealer (!?!) said the code was the right rear wheel sensor (see
bay13) and basically this indicates the ABS ECU rather than the wheel
sensor.
Hello cold weather!

Comments welcome!

Dunno where you are but try "billy davidson"
<[email protected]>

or
http://home.earthlink.net/~vicrocha/Volvo_Parts/Volvo_ABS_feedback.htm

Who may be able to help with fixing the ABS

Sean