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996TT warning bell

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My 996TT had been left for over 5 days so the remote didn't work. So I unlocked it with the key and by accident set off the alarm.

After driving it and parking up, I turned it off and a warning bell goes off when I open the door. The car says the light is on but no lights were on ?

I'm not sure if the alarm going off and this warning light are related but its all happened at the same time ????????

Andy :drive:

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Durametric got this code :

Instrument cluster

Current fault codes


Failure cruise control warning

light status not present


OPC thought it was the light switch too but changed it and didn't fix it.

Any ideas ?

Cruise control is fine?

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  • Admin

Fault code 9142 Failure of cruise control warning light

Diagnostic conditions

- Ignition on

Possible cause of fault

- A voltage drop in the vehicle electrical system (jump-lead starting) can cause fault code 9142 to be stored.

- Instrument cluster faulty

Diagnosis Troubleshooting

1. Withdraw ignition key and then switch the ignition on again. The fault is remedied? if not Step 2

2. Replace instrument cluster.

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The voltage drop may have been caused when the alarm went off. The car had been left for a week and a half and then I set off the alarm.

OPC didn't have enough time today to fix it but the next thing they were going to do was replace the instrument cluster.

Big thankyou to Loren for your help


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  • 4 weeks later...


just for future reference in case anyone else has the same problem.

Porsche had a really good dig about in the car and the instrument cluster was fine. They traced the fault to bad wiring in the engine bay. It took them about 8 hours to find but saw 2 wires which had worn and they were both live and was causing the problems.

Hope no one does become victim to this


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