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Stalling in gear (low and high speed) and ‘Transmission emergency run’ and ‘Reduced engine power’ warnings

peterjingram911

peterjingram911

PCGB Member
Member
Hi All,
Seeking some wisdom on some recent problems with my early model 997.2 cabriolet. Car is used regularly but still has fairly low miles.
Recently had two issues:
  • i) PSE Exhaust – stopped working.
  • ii) Car stalling in gear (low and high speed) after 10-15 minutes and also the appearance of ‘Transmission emergency run’ and ‘Reduced engine power’ lights coming on in tandem. No issues going into gear and if I switch off/on then the warning lights disappear. Since driven a couple of times without a problem, but then appeared again, so currently with garage.
For the PSE my local independent has checked wires etc. but concluded that the solution was to replace the PSE switch, however, the light stays on and the PSE still not working. For the stalling, fault code P0335 was diagnosed and they replaced the flywheel (crankshaft) sensor, however, same issue (stalling/warning lights) is recurring and same fault code appears.

The independent is also doing their own investigations, but thought I'd reach out on the forum and see if anyone had similar issues and what was the solution?
 
PSE is usually seized valve flaps, but I would have thought your indie would have checked that.
 
Hi Peter,

I agree with John’s comment, but since PSE is vacuum operated it’s possible that there’s a vacuum leak in the system or a problem with the changeover valve which sends the vacuum to the activators, so that will be worth checking-out if the activators aren’t seized.

The P00335 fault code does relate to a crankshaft position sensor malfunction, but since this has been replaced it sounds as though there could be another issue. This link might give your Porsche Independent some ideas:

Transmission Emergency Run Error Message

After 39,000 miles in my 2011 GTS, I received a RED "Transmission Emergency Run" error message which effectively brings the car to a halt and then no power. The manual guide advises having the car towed to the nearest OPC. In my case I switched off the engine and waited a few minutes after...
www.porscheclubgb.com www.porscheclubgb.com

Jeff
 
Motorhead said:
Hi Peter,

I agree with John’s comment, but since PSE is vacuum operated it’s possible that there’s a vacuum leak in the system or a problem with the changeover valve which sends the vacuum to the activators, so that will be worth checking-out if the activators aren’t seized.

The P00335 fault code does relate to a crankshaft position sensor malfunction, but since this has been replaced it sounds as though there could be another issue. This link might give your Porsche Independent some ideas:

Transmission Emergency Run Error Message

After 39,000 miles in my 2011 GTS, I received a RED "Transmission Emergency Run" error message which effectively brings the car to a halt and then no power. The manual guide advises having the car towed to the nearest OPC. In my case I switched off the engine and waited a few minutes after...
www.porscheclubgb.com www.porscheclubgb.com

Jeff
Click to expand...
Many thanks Jeff.
 
peterjingram911 said:
Hi All,
Seeking some wisdom on some recent problems with my early model 997.2 cabriolet. Car is used regularly but still has fairly low miles.
Recently had two issues:
  • i) PSE Exhaust – stopped working.
  • ii) Car stalling in gear (low and high speed) after 10-15 minutes and also the appearance of ‘Transmission emergency run’ and ‘Reduced engine power’ lights coming on in tandem. No issues going into gear and if I switch off/on then the warning lights disappear. Since driven a couple of times without a problem, but then appeared again, so currently with garage.
For the PSE my local independent has checked wires etc. but concluded that the solution was to replace the PSE switch, however, the light stays on and the PSE still not working. For the stalling, fault code P0335 was diagnosed and they replaced the flywheel (crankshaft) sensor, however, same issue (stalling/warning lights) is recurring and same fault code appears.

The independent is also doing their own investigations, but thought I'd reach out on the forum and see if anyone had similar issues and what was the solution?
Click to expand...
 
Hi. I had pretty much the same issue with reduced engine power. I took it to a specialist and they changed the valve solenoid and job done. She spurring at low speed and screaming like a wild cat taking it through the revs. About £700.
 
Thanks for all the advice.
So after a few weeks of investigation, including testing the ECU (or ECM) on another vehicle, the specialist concluded that the ECM was the issue.
Unfortunately, during investigation they were unable to determine what exactly the issue was with the ECM itself, so the solution was to replace/clone the ECM.
Still relatively early days, but the problem with both the PSE and intermittent stalling seems to have been resolved.
 
Hi Peter, thanks for providing an update on your car. I hope that the solution holds and you are able to enjoy it to the full.

I think it is unusual to have such a failure of the ECU, but note that yours is a cabriolet. I wondered whether you have had any problems with water ingress or if there was any sign of damage to the old unit?
 
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