Mercedes 9G-Tronic Problems – Causing P073E00 & P07B700
Do you have a post-2014 Mercedes that’s experiencing problems with its 9G-Tronic automatic transmission? If you’ve also got P073E00 or P07B700 stored, this sounds like a mechatronic fault. This is actually quite common, but thankfully, we can help.
The control module for Mercedes’ 9G-Tronic is a known weak point and it’s been causing a range of problems for owners recently. As well as the aforementioned P073E00 and P07B700 codes, 9G-Tronic mechatronic failure will also cause an issue where only third gear can be selected.
Thankfully though, we offer a comprehensive remanufacturing service for the 9G-Tronic mechatronic to resolve these problems for good, no matter which Mercedes model the unit has come from. Fill out our test form to get started.
What is the 9G-Tronic?
The 9G-Tronic succeeded the 7G-Tronic to become Mercedes’ latest automatic transmission in 2014. As implied by its name, it’s comprised of nine gears and it was introduced in an attempt to improve upon the 7G-Tronic’s fuel economy.
These gearboxes were debuted on the E350 BlueTEC E-Class in 2014, before being included as standard in the 5th generation E-Class from 2016. You’ll also find them in S-Class models from 2014 (W222 and W223), C-Class and GLE models from 2016 (W166, W167, W205 and W206) and all GLC vehicles (X253 and X254). The 9G-Tronic can also be found on the SLK 200 (R172) from 2015-2020 only.
If ever investigating problems with this gearbox, you’ll notice the 9G-Tronic is slightly lighter and has much fewer electrical connections than its predecessor, despite incorporating two extra gears. By widening the span of gears, it was claimed by Mercedes that fuel consumption would be reduced by 6.5% while gear shifting would become barely noticeable.
Unfortunately though, the mechatronic unit responsible for gear shifting and clutch engagement in the 9G-Tronic is renowned for internal failure, inevitably making gear shifts all too noticeable for affected owners.
Mercedes 9G-Tronic problems
When mechatronic failure strikes, typically once the gearbox is up to temperature, shifting becomes harsh until drive is unable to be selected and the vehicle remains in neutral. After a few attempts, the gearbox will enter drive, but it’ll only use third gear. This is a fail-safe feature of the 9G-Tronic by only allowing the selection of a middle gear to prevent the transmission from being damaged further.
This of course indicates the TCU within the Mercedes 9G-Tronic’s mechatronic has detected an internal problem, so at this point the vehicle should be scanned with diagnostic tools. Inevitably, affected owners will uncover a P073E00 and a P07B700 code when these symptoms have been caused by TCU failure:
- P073E00 – Reverse Gear Cannot Be Engaged
- P07B700 – Pressure Sensor Signal Invalid
Mercedes 9G-Tronic problems: P073E00
As referenced above, this code relates to an inability to engage reverse gear, but it actually stems from a hydraulic pressure control issue within the gearbox. In some cases, affected owners are still able to select reverse, in addition to third gear (the fail-safe gear).
This is because P073E00 is caused when the TCU can’t verify whether adequate hydraulic pressure was built to enable gear selection. The mechatronic’s internal fault is preventing the TCU from validating information fed to it by sensors. As a result, the TCU can’t confirm the requested gear has been engaged, even if it has been mechanically, and so P073E00 is stored.
Mercedes 9G-Tronic problems: P07B700
Again, this code is another indication of TCU confusion stemming from the internal mechatronic fault. The P07B700 code means the TCU is receiving a pressure-related signal that is either implausible, missing or outside the expected range.
This of course triggers the P07B700 code to store, but it also forces the 9G-Tronic into a failsafe mode as the TCU can’t be sure that the gearbox can operate safely and efficiently.
How to resolve Mercedes 9G-Tronic problems reliably
Once owners have isolated their symptoms to a defective 9G-Tronic mechatronic control unit, they’ll undoubtedly be recommended to replace it. This is not the most effective solution.
You’ve got to remember that your Mercedes’ 9G-Tronic problems were caused by component breakdown in the mechatronic unit. This means replacement units will come loaded with the same commonly-failing components, inevitably leading to yet another transmission fault.
Not only this, but replacement mechatronic units are priced extortionately and aren’t always readily available and in stock with all dealerships. Instead, we recommend taking advantage of our bespoke remanufacturing service for the Mercedes 9G-Tronic.
Our expert techs will analyse your control module on state-of-the-art testing rigs to uncover the root cause of failure accurately and reliably. We’ll then rebuild your unit with higher-than-OEM-standard components so that functionality is restored to last. You’ll be charged significantly less than the cost of a brand-new mechatronic and it’ll only take 2-3 working days. We’ll even cover you with an unlimited-mileage lifetime warranty too – much longer than other 9G-Tronic repair services.
Resolve P073E00 and P07B700 reliably by having your 9G-Tronic’s mechatronic control unit comprehensively remanufactured – get started by completing our test form.
Common failure symptoms:
- Can only select third gear
- Transmission dropping out of D to N
- Loss of reverse gear
- Harsh gear changes
Common fault codes:
- P073E00 - Reverse Gear Cannot Be Engaged
- P07B700 - Pressure Sensor Signal Invalid
Test and rebuild:
All control modules are carefully analysed on our hardware-in-the-loop testing rigs. Once a fault has been confirmed, our team of expert technicians will remanufacture your unit using top-grade components and the latest techniques.
Programming:
All information related to programming is retained throughout our process. This means you won’t need to have your rebuilt mechatronic recoded to your vehicle once you receive it back from us, unlike replacement units.
Quality:
Providing an excellent service is at the forefront of everything we do. This is evidenced by our proud defect rate of just 0.49%. As such, this has helped us become the chosen provider of automotive remanufacturing services for thousands of industry specialists worldwide.
Warranty:
Lifetime unlimited mileage*
How do I get my unit rebuilt?
To pay for the rebuild click the Shop Now link above, select your part number and click: Get yours rebuilt.
Print the payment/booking confirmation email.
Package the mechatronic inside a sturdy box with plenty of packaging material (make sure you include your confirmation email in the box).
Send us your package by tracked courier (the shipping instructions are on the confirmation email).
Once received we will test, rebuild and return your TCU with an unlimited mileage lifetime warranty. (if your unit turns out not to be faulty then we will refund your payment less a small testing fee and return shipping)
What if I don’t want to pay up front?
This is not a problem, if you prefer this option then follow the following steps:
Fill in and submit this test form.
Print the booking confirmation email.
Package the mechatronic inside a sturdy box with plenty of packaging material (make sure you include your confirmation email in the box).
Send us your package by tracked courier (the shipping instructions are on the confirmation email).
Once received, we will test your control module and call you to advise on the outcome of testing, if your unit is faulty and you choose to go ahead with the rebuild then we will take payment over the phone using a debit/credit card.
We will then rebuild your mechatronic and return it to you with an unlimited mileage warranty.
If you require further information regarding this 9G-Tronic fault then please contact us.