7 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHIntermittent P0335 (Crankshaft Position Sensor) and Voltdown on 2002 Porsche 996 C4S
Leading reported evidence
Check (including at high rpm)
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Intermittent P0335 (Crankshaft Position Sensor) and Voltdown on 2002 Porsche 996 C4S
Read full discussion summary
Leading evidence: 'Check (including at high rpm)' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'ecu ground' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check (including at high rpm)' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Intermittent P0335 (Crankshaft Position Sensor) and Voltdown on 2002 Porsche 996 C4S
Install battery
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Intermittent P0335 (Crankshaft Position Sensor) and Voltdown on 2002 Porsche 996 C4S
Install engine-to-chassis ground cable
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Intermittent P0335 (Crankshaft Position Sensor) and Voltdown on 2002 Porsche 996 C4S
Install starter motor
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Intermittent P0335 (Crankshaft Position Sensor) and Voltdown on 2002 Porsche 996 C4S
Coverage and how to read this overview
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
7 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T181445Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hello, I need some help and hopefully anyone has experienced the same issue and has resolved it.
Description:
For several months, my car has been failing to start on the first attempt intermittently. The starter motor cranks at normal speed. This occurs regardless of whether the engine is hot or cold.
Symptoms:
When it fails to start promptly, it throws code
P0335: RPM Input Circuit
.
When the code is present, the car enters a "limp mode" where it bogs down/cuts out above 4,500 RPM.
If the car starts correctly and the code does not trigger, it drives perfectly.
If the code isn't triggered at startup, it never appears during driving.
The
Check Engine Light (CEL)
never illuminates.
Work already performed:
Replaced
Crankshaft Position Sensor (CPS)
.
Installed a new battery.
Installed a new engine-to-chassis ground cable.
Fuel pressure checked (including at high RPM).
Inspected DME (ECU) connectors.
Installed a new starter motor
Replaced the DME relay.
Replaced the Coolant Temperature Sensor.
Diagnostic Data:
Using my iCarsoft POR V2.0, I noticed that during cranking, the voltage reported
at the DME
drops to
7.5 – 8.5 Volts
. However:
The battery stays above 10V during cranking.
The B+ jump point in the engine bay stays above 10V.
Fuse C1 stays above 10V.
Pins 30 and 87 of the DME relay stay above 10V.
Suspected causes / Questions:
I suspect a bad ECU ground, but I cannot locate
Ground Points 8 and 9
. Does anyone know their exact location?
Could the
X59/1 plug
in the engine compartment be the culprit?
What else could cause this specific voltage drop at the DME while the rest of the system remains stable?
My internet vote is for u to replace starter. Its requiring too much amperage in crank and drawing the system down so far the sensors r dropping out.
The reason the dme sees less is just basic voltage drops in the harness.
U should also inspect your wye electrical cable. There is another thread a few posts down and many more about this cable coroading.
https://rennlist.com/forums/996-foru...ing-issue.html
These guys also mention cam position sensor:
https://www.renntech.org/topic/33855-cel-i-have-the-codesplease-help
This is a source reference. Confirm exact model applicability in the original material.
