Fault code P1728 – a step-by-step guide to diagnosing and fixing it

The meaning of error code P1728 – Transmission Slip Error

P1728: Causes, signs and repairs

Error code P1728 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system has detected a fault in the automatic transmission control system, specifically a fault in the shift solenoid or transmission control unit. This manufacturer-specific DTC P1728 mainly occurs in Honda, Acura and some other Asian vehicle manufacturers and affects the electronic transmission control unit.

What can cause this error code?

Defective shift solenoid in the automatic transmission
Damaged wiring to the transmission control unit
Loose or corroded plug connections on the transmission
Low or contaminated transmission oil level
Defective transmission control module (TCM)
Internal transmission problems or wear
Faulty sensors in the transmission
Overheating of the automatic transmission

What symptoms occur in parallel with fault code P1728?

Shifting problems: The transmission shifts jerkily or irregularly
Emergency running program: The vehicle stops in one gear
Loss of power: Reduced acceleration and driving performance
Noises: Unusual noises from the transmission area
Overheating: The transmission becomes unusually hot
Starting problems: Delayed response when starting off

How to fix the problem of error code P1728?

The repair requires a systematic diagnosis of the transmission system to identify the exact cause.
Check the transmission oil and change it if necessary, as contaminated or insufficient oil is often the cause
Check all electrical connections on the transmission for corrosion and loose contacts and clean them
Replace the shift solenoid if the diagnosis confirms a defect
Test transmission control module (TCM) and replace or reprogram if necessary
Complete transmission repair or replacement in the event of internal mechanical damage
Flush transmission and change filter to remove contamination

FAQ - Frequently asked questions about DTC P1728

Can I continue driving with error code P1728?

Short journeys are possible, but the vehicle should be taken to the workshop as soon as possible, as there is a risk of further transmission damage. Trouble code P1728 can lead to costly consequential damage.

How much does it cost to repair error code P1728?

The costs vary depending on the cause: oil change costs €150-300, solenoid replacement €300-800, transmission repair can cost €1,500-4,000. A precise diagnosis is required to estimate the costs.

Is the error code P1728 manufacturer-specific?

Yes, P1728 is a manufacturer-specific EOBD code that occurs mainly in Honda and Acura. Other manufacturers use different codes for similar transmission problems.

Can I repair the error code P1728 myself?

Simple measures such as oil changes are possible, but most repairs require specialized tools and expertise. Transmission work should be carried out by qualified mechanics.

How can I prevent error code P1728?

Regular transmission oil changes every 60,000-100,000 km, gentle driving and avoiding overheating will help prevent this DTC. Warning signals should not be ignored.

Does the P1728 code disappear by itself?

No, this fault code will not disappear without repairing the root cause. The OBD system will continue to store the fault until the problem is resolved.

Vehicles in which fault code P1728 occurs most frequently

Error code P1728 is a manufacturer-specific trouble code for automatic transmission control problems and can cause serious driving problems, but is most common in the following vehicles:

Honda: Accord, Civic, CR-V, Pilot, Odyssey (1998-2015)
Acura: TL, MDX, RDX, TSX, Integra (1999-2014)
Nissan: Altima, Sentra, Maxima (2002-2010)
Infiniti: G35, G37, Q50, FX35 (2003-2012)
Mitsubishi: Lancer, Eclipse, Galant (2000-2012)
Mazda: 6, 3, CX-7, CX-9 (2003-2013)

If the code P1728 occurs in your vehicle, you should not hesitate to visit a qualified workshop. Transmission problems can quickly worsen and lead to costly repairs. Early diagnosis and repair can often prevent major damage and significantly extend the life of your automatic transmission.

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