P1718 code

Tezza_1 · Post by **Tezza_1** » 25 Aug 2021, 15:36

Hi, I've recently had the above code flash up on the dashboard, I've got a Citroen C4 Picasso semi-automatic, 09 plate, drives fine goes through gears fine, occasionally when trying to go into reverse it doesn't want to know. Any advice would be appreciated thanks

Post by **GiveMeABreak** » 25 Aug 2021, 16:52

Hi and welcome. This fault is to do with the gear selection control or an electrical issue with it:

Fault Code:	P1718
Description of Fault:	Gear selector signal fault (Lever) : Coherence. Signal from the gear selector sensor incoherent (one or more of the switches on the selector faulty).
Conditions for Fault to clear:	No faults for 2 seconds.
Downgrade Modes whilst Fault is active:	If the vehicle is moving in forward gear, automatic mode is activated and reverse gear cannot be engaged. Starting possible provided the gearbox is manually in neutral with presses on the brake pedal. Possible to engage the gears via the paddles. Crawling deactivated. If the vehicle has the Stop and Start system: Stop and start function deactivated. Warning Lamps Displayed: "SERVICE" warning lamp Sport warning lamp Snow warning lamp Automatic or 6-speed piloted manual gearbox warning lamps (Orange PRND triangle) Display of a "-" on the fascia panel
Symptoms:	Difficult/impossible to change a gear. Lack of power. Absence of automatic stopping of the internal combustion engine.
Suspect Areas:	Piloted manual gearbox ECU. Sealing of the connectors and harnesses. 28-way connector of the piloted manual gearbox ECU. 28-way harness of the piloted manual gearbox ECU. Gear lever. Gearbox ECU. Earth cable. Earth screw.

So has any work been done lately that could have impacted on the electrical connections of the gearbox selection controls or any wiring modifications or aftermarket equipment added?

Tezza_1 · Post by **Tezza_1** » 25 Aug 2021, 17:21

Hi Marc, thanks for getting back to me, other than having 2 new drive sensors put on by my mechanic at a local garage then no. It only came up a few days ago. We did a diagnostic check and that's the code that came up , tezza

Tezza_1 · Post by **Tezza_1** » 25 Aug 2021, 17:26

Hi Marc, other than having 2 new drive sensors put in then no, this came up a few days ago and when we did the diagnostic check it gave the code p1718 with a msg, gear lever signal fault,

Post by **GiveMeABreak** » 25 Aug 2021, 18:06

I'm not sure I understand what you mean by 'Drive Sensors' - can you explain what these are....

Tezza_1 · Post by **Tezza_1** » 26 Aug 2021, 11:25

The drive sensors are located under the front wheels

Post by **GiveMeABreak** » 26 Aug 2021, 12:31

Ok, some terminology confusion - I think you are referring to the wheel speed sensors used by the ABS / ESP system for various functions - including supplying the piloted gearbox with information.

I would check that any connections have not been disturbed on the piloted gearbox ECU as these could easily have been moved during the recent work on the wheel speed sensors - but obviously some further investigation is needed. The first checks should always be the electrical plugs and connections on the piloted gearbox ECU and earths.

Tezza_1 · Post by **Tezza_1** » 26 Aug 2021, 13:32

Hi Marc, that's great thank you I'll check that out and see how it goes

HaroldCGKing · Post by **HaroldCGKing** » 21 Jan 2023, 15:10

Hi Marc

I have the P1718 selector lever (of doom) error.

I am reluctant to take the car (C4GP 2007) to any garage which doesn't have specific knowledge of this fault.

Could you suggest anyone? I am prepared to travel ANYWHERE in the UK.

Harold

Post by **GiveMeABreak** » 21 Jan 2023, 18:37

Hi Harold, I've already put up the code error fault descriptor as you have probably seen. So short of this, that will be what the dealer sees and will investigate the suggested areas. These piloted systems can be hard to troubleshoot given the nature of the system, so my suggestion would be to save travelling and time wasting by getting it to Citroen as it may save time and money in the long run.

HaroldCGKing · Post by **HaroldCGKing** » 23 Jan 2023, 16:07

Thanks Marc

Just got back from Toomey Citroen after speaking to a very knowledgeable technician there, and have booked it in for the work.

Harold

HaroldCGKing · Post by **HaroldCGKing** » 26 Jan 2023, 17:49

Hi Marc

I removed the selector lever from the steering column, and the solder joints on the PCB for the lever sensors look iffy. The gearbox is working correctly at the moment.

I am going to suck the original solder, and re-solder.

I'll keep you informed.

The replacement selector is a Delphi part number 96811352XT. Costs about £550 !!!!! However, a Chinese part is available for £150.

From reading various forums about which selection by the lever does, or does not work, I am inclined to think that the solder joint breakdown of the sensors maybe the culprit.

Best

Harold

Post by **GiveMeABreak** » 26 Jan 2023, 19:16

That's mostly all these problems will ever be - electronics on the board like the chips, the soldering or the the actual physical parts of the switches that sweep across wearing out.

Best of luck, let us know if that's successful.

HaroldCGKing · Post by **HaroldCGKing** » 27 Jan 2023, 13:48

Hi Marc

Obviously a very well known problem in France. The company below does a refurb exchange for 49 euros !!

https://www.alsace-electronique-auto.fr ... troen.html

Also, France Auto in Poland sells the genuine Delphi part for 155 euros. It's not worth buying a used part. Citroen UK are taking the p155 @ £550.

https://www.franceauto.pl/en_GB/p/Semi- ... rrency=EUR

Harold

Post by **GiveMeABreak** » 27 Jan 2023, 15:03

I agree, it's an outrageous price.

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