Vauxhall Signum fault codes - what do they mean? | Ask Honest John

What is life like with your car? Let us know and win £500 in John Lewis vouchers | No thanks

Vauxhall Signum fault codes - what do they mean?

I own a Vauxhall Signum diesel 2006 plate. The engine management lights keeps coming on when I floor it or press down quick on the accelerator. The car/spanner light comes on at other times but not together.

I've taken it to a local garage and the fault codes P0023 and P0400 and P0235 come up. I have paid out money for the codes to reset and the problem hasn't gone away.

I took it to a diesel specialist and they can't pinpoint what's wrong. Changed mass air flow sensor and new diesel filter and air filter. Cleaned with EGR valve cleaner about four times. Not much change. Taken EGR valve out and cleaned. Not much change ether. Any ideas?

Asked on 19 May 2015 by Martin signum 3.0ltr

Answered by Honest John

This engine was also fitted to SAAB 9-5s and they are infamous for EGR related problems: www.honestjohn.co.uk/carbycar/saab/9-5-1997/?secti...d

Tags: diesel engines technical issues fault codes

Similar questions

Chrysler Voyager fault codes - what do they mean?

I have a 2004 Chrysler Voyager diesel auto, which I've owned for three months. It seemed fine, until recently, when it started making a clonk noise and stalling under heavy acceleration. Two fault codes...

Why is my Vauxhall Astra going into limp home mode?

I own a 2017 Vauxhall Astra 1.6 CDTI SRI NAV. The engine light is on and going in limp mode. It shows codes: P2453, P2452, P244A, P226D. Can you tell me what is wrong with my car?

Peugeot 206 fault codes - what do they mean?

I'v owned a Peugeot 206 2.0-litre diesel (2004 model) for a couple of years. The engine management light came on within an hour of me buying the car but I just ignored it as it didn't seem to affect the...

Related models