160 Holland Ave.

Went to start the car one cold night it was like 5 degrees turned over a few time started up drove fine for a few days. Went to start it again now it just turns over. Here's a list of things I changed back in November 2014.

New coil packs
new spark plugs
new battery
new coolant temp sensor
new crank positioning sensor
new fuel pump and filter
codes coming up now are engine start blocked by immo.
Multiple misfire
low voltage
changed battery and still the same

BrianC72gt

Year? Codes? CEL?

Wet ECU?

If not...pull and re-seat instrument cluster to clean the connection contacts.

160 Holland Ave.

2000 audi a8l. Multiple misfire and engine start blocked by immo n low voltage coming up

160 Holland Ave.

Turns over but start. 18048 internal control module error comes up help please

160 Holland Ave.

Pulled cluster out clean contacts. Reseated it back in place lights all come on but brake light flashing and abs light on. Key light flashing Codes pulled

01203-Electrical connection between abs and cluster
18058-power train data bus: missing message from instrument cluster

BrianC72gt

I'm awkward. The first time I pulled mine. I wrestled with the connectors....no slack...anyway, I got some weird behavior, pulled it again and saw that some of the pins got bent over when I reconnected it. Some jewelers screwdrivers and a tweezers got them all straightened out. Then it was fine. I would check that first.

Have you done any welding on the car recently? Accident repair? I tack welded a trailer hitch before removing it to weld up completely, which caused some internal contact scoring. I DISSECTED the cluster...ribbon cable connectors...contact cleaner. Here is how you take it apart:
audipages Installing Dash Rings in the Audi A8/S8

160 Holland Ave.

No welding or anything like that. It was cold outside battery got drained charged it and it started right up then cut off. Pulled battery out got a new one and still cranks no start. I'm kinda thinking of selling it for parts or fixer. I give up on it anyone interested shoot a pm

160 Holland Ave.

Waited for it to get warmer outside n tried resetting cluster and still same issue. Engine start blocked by immo terminal voltage to low. Someone help please.

twentysevenlitres

Are you saying the car will not start or fire at all?

If so, then the immobiliser code you're getting is a symptom, not the cause.
The immobiliser will let the engine physically start, then will stall again 2 secs later. This is consistent behaviour of the immobiliser. If it's not doing this, then the issue is somewhere other than the immobiliser.

I'd be checking the ECU box for wetness as Brian suggested. I'd also try unplugging and replugging the ECU. Also check the ECU power supply relay (not sure if it's in the ECU box or under passenger front floor on a D2...

160 Holland Ave.

Thanks for your reply. I diss reseat the cluster all the lights went off. Key light stopped blinking. Cleared all the codes tried statying it again and nothing, turns over but won't fire up. I'm going crazy. Maybe it's my battery but I took to get checked n they told me it's good. I'm going to try to clean the contacts of the negative connection under the passenger front wheel well then we'll see what happens. I'll keep you posted. Thanks