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P2135 & P2104/6 Error Codes - Engine & Ancilliaries/Gearbox - The Lotus Forums Jump to content
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P2135 & P2104/6 Error Codes

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I was driving home last night, not hooning around as I had kids and wife onboard.

Car went into limp mode with Engine Management Light and Traction Control light came on.

Quick read of codes with the scanguage presented:

P2135

P2104/6 (both are "limp mode" codes and sometimes its a 2104 and sometimes its a 2106)

Looks to be some kind of mismatch of values between pedal and throttle body.

Everything else appears fine, car was driving well, no funny clunks or rattles before the lights came on.

I can clear the codes but they come back, some times instantly other times after 500yrds down the road.

So far, based on other mentions of P2135, I've disconnected and reconnected the plug for the throttle body. I've not used contact cleaner, need to pick some up at lunch time. All of the threads I've found, mainly on LotusTalk, have never been revisited by the OP stating how they actually resolved their issue! :(

Car does have a warranty (insurance backed provided by MMC) that I need to investigate, but if it's as simple as cleaning connections then I can do that myself rather than get a dealer to sort it. Clearly if it's more than dodgy connectors, then I need to find out how to claim on warranty to get it resolved.

Help?!


Throttle Position Sensor 'A'/'B' Voltage Correlation
P2135
Description
Two potentiometers are built into the throttle actuator unit in order to provide a throttle position signal to the
ECU. Two processors within the ECU compare the two output signals, which should match within a defined
tolerance. Note that the potentiometers operate on 5 volts.
Enable Criteria:
None
Disable Criteria:
Throttle position greater than 60%
Potential failure modes:
# TPS1 reading incorrectly
# TPS2 reading incorrectly
Notes:
A maximum throttle opening of 15% may be imposed

Throttle Actuator Control System – Forced Idle
P2104 Description
If a problem is detected which could result in faster engine speed than commanded by the pedal, the actuator
is switched out, allowing the throttle valve to default to a 6% mechanically sprung setting. This provides a fast
idle speed which may be used to effect a 'limp home' mechanism.
Monitor:
Continuous
Enable Criteria:
Engine running
Disable Criteria:
None
Potential failure modes:
# Electronic throttle fault
Note:
This code indicates action taken by the ECU, and will always be accompanied by another code which
has caused this action.

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Hi Lee - you could try a quick call to Craig at MMC he may be able to offer "best" advice over the phone and will certainly be able to sort out the warranty.

I had a problem with my car (bought around the same time as you from them) with the window actuator and that is being sorted with no hassles. They are a great dealer.

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Craig is on leave until tomorrow, but yes I will speak with him asap.

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Sorry to hear of your issue Lee, there has been a few topics about throttle body / harness issues mostly on Lotus Talk I believe. Have you seen this thread? Might be worth a call to Lotus Silverstone.

Hope you get it sorted soon what ever it is!

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Oh great! £500 of harness (deroure pricing)!

Having said that, a new Throtte Body is £917 (+vat I think) at deroure!

I'm hoping (fingers crossed) that it's a case of cleaning the contacts to resolve the issue.

I've emailed Craig @ MMC for advice, but I will also drop Lotus Silverstone an email as I have an existing appointment with them on 8th June.

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I would hope / assume your warranty would cover it Lee.

Think I read something about Lotus upgrading the loom throttle body connectors to gold plated ones on Lotus Talk.

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I have gold pins on my throttle body, but regular metal female pin sockets on the connector? Who knows! :D

I bought some contact cleaner at lunch, will give that a try tonight.

Will do the throttle body connector and the pedal connector.

I assume there are other points, but who knows where!

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I had a similar thing after a long 80mph cruise control run down from Aberdeen when I had my last NA.  Slowed for a slip road and car did as described.  Late Sunday evening.  I do not know which codes I had (I have code notes at home but offshore presently) but I got home last 10 miles by back roads as doing 40 on busy A9 is scary and called the AA out.  

It only took a cleaning of some of the larger diameter pipework somewhere around the top of the engine.  Don't ask me what they were as I barely looked but easy access for him with a few screws and a wipe with a rag which came up oily/black residue (but not much) and put back together and fault cleared.  Something to do with airflow sensor not agreeing with throttle position sensor or similar hence the saver mode when I spoke to Craig with the codes.   It never returned.

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Thanks Al, that inspires confidence.

Someone else mentioned cleaning the throttle body, as the butterfly valve can get gummed up.

So your AA mans oilly rag around the inlet pipe fits in with that theory.

So my plan of attack is:

Contact Cleaner on connections

Remove and clean throttle body

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Butterfly valve position being mentioned is coming back to me in the vast greyness of my mind!  It was an easy fix anyway.

You will have guessed I leave oily bits to Craig these days. I've given up tinkering years ago when electronics took over everything.  :ice:

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Well sadly cleaning the contacts with contact cleaner didn't make any difference, nor did giving the TB a quick clearn with a dry lint free cloth.

I got further up the road before the codes kicked in, but it was definitely the same codes.

Think I might try an ECU reset, what do you think?

Better or worse state?

http://www.thelotusforums.com/forums/topic/52354-i-need-your-help-my-evora-is-dying/?p=420533

1)Open the trunk car and then remove the carpeting to expose the car battery cover. Remove the cover to access the battery. Unscrew the battery clamp and pull the battery out. Using a spanner, remove the negative terminal from the battery post. Once it has been disconnected, leave it for 20 minutes and then connect it back onto the battery post and tighten it up with a spanner.

2)Insert the key into the ignition in the first position and leave it in that position for 6 minutes.

3)Start up the vehicle and let the engine idle for 8 minutes.

4)Turn off the engine and turn it back on, and go for a quick spin around your block. (make sure you've secured your battery first).

5)At this stage, the ecu unit will be reset. It'll take 40-50 minutes of regular driving before your car learns the correct fuel mixtures to run optimally.

Interestingly, the OP of that thread had exactly the same error codes as me, but he's never been back to say how it was resolved :(

@Bibs, do you have an email for that user? Not sure if he'll get PMs as he last visited in 2012.

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I had to do some of that under Craig's guidance once for a reset years ago over the phone.  Wasn't so many steps or waits though.  There was also something for clearing the fuel mapping by 10 or so full throttle burps because if the car is driven like a pussy for a long time by somebody it 'learns' their driving style it seems and it needs woken up to the fact a boy racer is on the controls now.

Best speak to him if he is back in tomorrow.  However as he has been off for various reasons for about 2-1/2 weeks he may be difficult to get hold off as the whole Lotus world in Scotland will have been waiting for this moment.....

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Yeh, think I might wait until tomorrow.

Need to speak to Craig, see what his thoughts are.

Will also start speaking to local dealers (Silverstone/Hoffmans/Bell&Colville), see what their thoughts are.

Ideally it needs a dealer with access to other Evora, so they could try swapping the throttle body for example if it's believed to be that at fault.

Thanks for everyone's help so far... I promise to keep this thread updated, unlike the other threads I've found with similar issues where they have never updated what the resolution was.

Cheers,

Lee.

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Just to keep the thread updated... (one of my biggest gripes.. why start a problem thread and then never update it, helping others later).

Called the AA today, they came out, read fault codes and requested low loader (as we all could have guessed).

Low Loader is due any time now, to take the car to Lotus Silverstone.

I've let Pam @ Lotus Silverstone know the car will be arriving this afternoon.

They have details of the AutoProtect warranty and should be able to sort it for me.

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I just checked with the factory and this is a dealer job, there's no easy roadside fix I'm afraid.

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Didn't expect it to be Bibs, but I do thank you and your contacts for any support :unworthy:

I am keen to know where the fault lies and I hope it's an easy fix for the dealer.... and that they get the support from factory to help diagnose it....

CA7E6606-F123-448B-B32C-F4B7A6F21BDD_zps

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Just had notification from recovery truck driver, car now at Lotus Silverstone. :thumbsup:

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Depressing when it happens Coco... mine failed for another reason. It happened just before I needed to go to work. Wife's Volvo saved the day and an expensive taxi to pick the kids up! Hope yours gets fixed soon.

post-15194-0-13476900-1433031258.jpg

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Lotus need to do the RR thing and get the cars covered on transports. People watching would think the worst when that is possibly not the case.

Couldn't hurt.

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Mine was an AA transport (3rd party contractor), so nothing to do with Lotus though?

It's now at Silverstone, so hopefully they can take a look and get it diagnosed asap.

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Mine was a third party too. As it was a sports car they sent out a flat bed no question. There within 30 mins.

The guy loved the car an insisted that he wouldn't even bother to try getting it going! "Best leave it to the specialists".. Good I said!

He even took a video all around to prove that he wouldn't damage it

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The car is still at Lotus Silverstone, current thoughts are that it needs a new Engine wiring loom.

Craig @ Murray's thinks it's likely to be a loose pin in the connectors, so I think they are going to double check them before ordering a loom.

Not sure on cost or time required to replace loom if it comes to that... We shall see.

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So, a new Engine Harness loom is required :(

Zero in stock, although Lotus have now managed to "find" one, it cannot be delivered until end of next week.

Sounds to me like they are having to get one made by the manufacturer.

Looks like I need to cancel my Spa trip :no Hopefully I will at least have my car for the summer hopefully.

Lotus Silverstone have said it will take 10hours to remove and fit the harness.

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