P2704 Transmission Friction Element E Apply Time Range / Performance

P2704 Transmission Friction Element E Apply Time Range / Performance

OBD-II DTC Datasheet

Transmission Friction Element E Application Time Range / Performance

What does this mean?

This is a generic transmission diagnostic trouble code (DTC) and is commonly applied to OBD-II vehicles with an automatic transmission. This may include, but is not limited to, Chevrolet, GMC, Toyota, VW, Ford, Honda, Dodge, Chrysler, etc. Despite the general nature, the exact repair steps may vary depending on the year of manufacture, make, model and transmission configuration.

Friction element of transmission. A rather vague description given the fact that many friction elements are involved in the mechanical operation of an automatic transmission (A / T). Not to mention manual transmissions, which also use similar friction materials (such as the clutch).

In this case, I suspect we are referring to A/T. The symptoms and causes vary considerably depending on many factors, but it is important to note that the first thing to consider is the general condition of the automatic transmission and especially your ATF (fluid for automatic transmission).

Problems with internal friction materials in the automatic transmission are likely to cause erratic driving conditions in terms of shift timing, torque output, among many other consequences of this malfunction. Incorrectly paired tires, under-inflated tires and the like tend to cause internal slippage given unsymmetrical circumstances. However, keep this in mind when considering transmission functionality and troubleshooting. Have you recently installed a worn out tire? Same size? Check the sidewall of the tire to be sure. Sometimes minor differences can cause such indirect problems.

Usually, when the ECM (Engine Control Module) activates this P2704 and related code, it actively monitors and tweaks other sensors and systems to provide proper self-diagnostics. So rest assured you need to address this issue before your daily driving needs become a source of further potential problems. This could be a simple fix, definitely possible. However, it can also be a complex internal electrical fault (e.g. short circuit, open circuit, water ingress). Be sure to ask for help here accordingly, even professionals make easy-to-miss mistakes that are worth thousands in the experience here.

The letter "E" in this case can mean several different possible differences. Perhaps you are dealing with a specific chain / wire, or you may be dealing with a specific friction element in a transmission. Having said all that, always refer to your service manual for specific locations, differences, and other similar characteristics.

P2704 is set by the ECM when it detects that the internal "E" friction element inside the transmission is experiencing a general problem with its operation.

What is the severity of this DTC?

As explained earlier, this is not something that I would leave unattended, especially if you are actively using a car with the indicated faults. You should definitely do this first. Well, if driving is a necessity, daily.

Photo and sectional automatic transmission:

What are some of the symptoms of the code?

Symptoms of a P2704 trouble code may include:

• Uneven handling
• Slipping transmission
• Erratic gear shifting
• Abnormal change patterns
• Choosing a tough shift
• ATF leak (automatic transmission fluid)
• Low torque
• Abnormal output power

What are some of the common causes for the code?

Reasons for this P2704 friction element slip code may include:

• Low ATF
• Worn friction element (internal)
• Reasons for dirty ATF
• Wiring problem (e.g. open circuit, short circuit, abrasion, thermal damage)
• Uneven tire sizes
• Problem causing uneven rpm / circumference (e.g. low tire pressure, stuck brakes, etc.)
• TCM (Transmission Control Module) problem
• ECM (Engine Control Module) problem
• Damage to the module and / or seat belt by water

What are some steps to troubleshoot the P2704?

The first step in the process of troubleshooting any problem is to review the service bulletins for known problems with a particular vehicle.

Advanced diagnostic steps become very vehicle specific and may require appropriate advanced equipment and knowledge to be performed accurately. We outline the basic steps below, but refer to your vehicle / make / model / transmission repair manual for specific steps for your vehicle.

Basic step # 1

It is imperative that you follow basic maintenance procedures appropriately at this point in terms of transmission health, starting with the fluid. Your ATF (automatic transmission fluid) must be clean, free of debris, and proper maintenance schedules must be followed to avoid similar problems in the future. If you do not remember that the last transmission was serviced (for example, filter + fluid + gasket), it is recommended that you do this before proceeding. Who knows, your oil may have debris trapped inside. This may only require a simple service, so make sure you know the last A / T service you made.

NOTE. Make sure you are using the correct ATF for your specific make and model.

Basic step # 2

Chances are, when looking for a connector / harness for this system, you will have to find a connector. There may be one "main" connector, so make sure you are working with the correct one by referring to the manual. Make sure the connector itself is seated correctly to ensure a good electrical connection. If the connector is located on the automatic transmission, it can be subject to vibrations, which can lead to loose connections or physical damage. Not to mention, ATF can contaminate connectors and wires, causing future or present problems.

Basic step # 3

It's always good to know the general condition of your vehicle. Given the fact that, as in this case, other systems can directly affect other systems. Rough tyres, worn out suspension parts, wrong wheels - all of these can and will cause problems in this system and possibly others, so even the problems will go away and you can get rid of this code.

This article is for informational purposes only and technical data and service bulletins for your specific vehicle should always take priority.

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