P1023 Diagnostic Trouble Code Discussion for September 2017
Ignition Coil 3 Output Stage Circuit Performance
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| Help Request | Posted | |
| 2012 Porsche Panamera Turbo S 4.8L reduce engine speed VIN: WP0AB2A71C P1023: fuel pressure regulator valve short ckt. to ground upper limit value exceeded. the codes i listed will not clear. during 2 test drives, i never got the reduce engine speed warning. at idle, fuel pressure readings are about 380 kpa - specs according to Alldata are 550 - 580 kpa, so it's a little low of course. we called a friend at the de... |
September 12, 2017 | |
| 2008 Porsche Cayenne GTS 4.8L Misfire VIN: WP1AD29P18 P1023: Low fuel pressure at start up. ... P0303, P0306, P0307. Car runs rough under load around 30-45mph. I can't imagine 4 coils going bad, was thinking a software reflash or a fuel pump. I don't see many of these cars and would appreciate any help. |
September 19, 2017 | |
| 2012 Porsche Panamera Turbo S 4.8L reduce engine speed VIN: WP0AB2A71C P1023: fuel pressure regulator valve short ckt. to ground upper limit value exceeded. the codes i listed will not clear. during 2 test drives, i never got the reduce engine speed warning. at idle, fuel pressure readings are about 380 kpa - specs according to Alldata are 550 - 580 kpa, so it's a little low of course. we called a friend at the de... |
September 22, 2017 |
