C70 Warning Lights - Fault?

Hollychocs · Oct 22nd, 2019, 00:35

I have a 2005 C70 - Every few weeks I have 'Brake Failure'; ABS, Engine, Power Steering & Transmission service lights come on & I lose power, all dials on dash stop working. As soon as I turn the engine off, the immobiliser comes on.
The next day - the cars is fine again. There is nothing wrong with the brakes etc!
Does anyone have any ideas please? We think it may be the sensors. Can I disable them?

Clogs · Oct 22nd, 2019, 07:19

You need to get the codes read to find out what's wrong. Disabling the warning lights is an MoT fail,

volvo again · Oct 22nd, 2019, 10:33

As Clogs said.
Disabling warning lights defeats the object of them...also, what sensors would you disable if you don't know which may be causing the problem...it could be none of them but a loose connection somewhere...
A basic code reader should highlight any faults but it may need more specialised Volvo diagnostics

acshortt5 · Oct 22nd, 2019, 11:30

Possibly could be the electrical part of the ignition switch.

While the engine is running try gently moving the key in the ignition one way then the other to see if it creates/solves issues.

Also check the connections on the battery, particularly the secondary positive connector (has a group of smaller wires joined together that go from the battery connector to the fuse box near the cabin filter).

Check the earth points as well, particularly the main one in front of the battery.

Luxobarge · Oct 22nd, 2019, 14:21

Given that when this happens you state that ALL the dials on the dash stop working, I doubt this is a fault caused by one or more sensors, it sounds like a more basic electrical fault to me. So although normally I'd say yes, definitely read the codes, in fact in this case I think Acshortt5 above is spot on IMHO, the electrical part of the ignition switch in particular is a common fault on these.

Stumo · Oct 23rd, 2019, 00:39

+1 on ashcrofts thoughts - electrical part of ignition switch. Post back and let us know what you find.

Hollychocs · Oct 23rd, 2019, 10:14

Quote:

Originally Posted by Clogs

You need to get the codes read to find out what's wrong. Disabling the warning lights is an MoT fail,

When we had the codes read it said everything was wrong with it!

Oct 22nd, 2019, 00:35	#1
Hollychocs New Member Last Online: Oct 23rd, 2019 15:52 Join Date: Sep 2018 Location: Browston	C70 Warning Lights - Fault? I have a 2005 C70 - Every few weeks I have 'Brake Failure'; ABS, Engine, Power Steering & Transmission service lights come on & I lose power, all dials on dash stop working. As soon as I turn the engine off, the immobiliser comes on. The next day - the cars is fine again. There is nothing wrong with the brakes etc! Does anyone have any ideas please? We think it may be the sensors. Can I disable them?

Oct 22nd, 2019, 07:19	#2
Clogs Clogs Last Online: Dec 26th, 2023 08:04 Join Date: Dec 2012 Location: Canterbury	Limp mode You need to get the codes read to find out what's wrong. Disabling the warning lights is an MoT fail,

Oct 22nd, 2019, 11:30	#4
acshortt5 Volvo Nutcase Last Online: Jul 14th, 2023 12:57 Join Date: May 2007 Location: N/A View Photos By: acshortt5	Possibly could be the electrical part of the ignition switch. While the engine is running try gently moving the key in the ignition one way then the other to see if it creates/solves issues. Also check the connections on the battery, particularly the secondary positive connector (has a group of smaller wires joined together that go from the battery connector to the fuse box near the cabin filter). Check the earth points as well, particularly the main one in front of the battery. __________________ Andrew 1998 S70 T5 CD AUTO Previously a 1990 240 GLT-R

Oct 22nd, 2019, 14:21	#5
Luxobarge Premier Member Last Online: Today 17:37 Join Date: Jan 2011 Location: Horne (Nr. Horley)	Given that when this happens you state that ALL the dials on the dash stop working, I doubt this is a fault caused by one or more sensors, it sounds like a more basic electrical fault to me. So although normally I'd say yes, definitely read the codes, in fact in this case I think Acshortt5 above is spot on IMHO, the electrical part of the ignition switch in particular is a common fault on these. __________________ Some people are like Slinkies, they serve no useful purpose but they still bring a smile to your face when you push them downstairs.

Oct 23rd, 2019, 00:39	#6
Stumo Member Last Online: Dec 30th, 2023 01:00 Join Date: Nov 2015 Location: Christchurch/ New Zealand	+1 on ashcrofts thoughts - electrical part of ignition switch. Post back and let us know what you find. __________________ S70 '98 Auto Factory Fitted CNG Bi-Fuel 2.4 10v '”It’s a what??”

Oct 22nd, 2019, 10:33	#3
volvo again Master Member Last Online: Apr 17th, 2024 12:04 Join Date: Jun 2018 Location: Presteigne, mid Wales	As Clogs said. Disabling warning lights defeats the object of them...also, what sensors would you disable if you don't know which may be causing the problem...it could be none of them but a loose connection somewhere... A basic code reader should highlight any faults but it may need more specialised Volvo diagnostics

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