Fault code P1736 – a step-by-step guide to diagnosing and fixing it

The meaning of error code P1736 – Second Gear Switch Circuit Malfunction

P1736: Causes, signs and repairs

Error code P1736 is displayed and the check engine light is on - what does this mean?

The DTC P1736 is recognized by the OBD system and indicates a fault in the automatic transmission control circuit, especially in the shift valve monitoring. This manufacturer-specific fault code mainly affects the transmission control unit and the hydraulic components of the automatic transmission.

What causes can this error code have?

Defective shift valve in the transmission control block
Blocked or dirty hydraulic channels
Low or contaminated transmission oil level
Defective pressure sensors in the transmission
Damaged wiring to the transmission control unit
Loose plug connections on the TCM (Transmission Control Module)
Defective transmission control unit
Mechanical wear on the transmission pump
Clogged transmission oil filter

What symptoms occur in parallel with error code P1736?

Shifting problems: Jerky or delayed gear changes
Emergency running program: The transmission only shifts into certain gears
Starting problems: The vehicle is difficult to start when parked
Loss of power: Reduced acceleration and driving performance
Unusual noises: Howling or grinding noises from the transmission
Overheating: Increased transmission temperature during longer journeys

How can I fix the problem with error code P1736?

Repairing trouble code P1736 requires a systematic diagnosis of the transmission components.
Change the transmission oil and filter, check the oil level and quality and flush dirty hydraulic channels
Check the wiring and plug connections to the transmission control unit for damage and replace defective cables
Test pressure sensors in the transmission with a multimeter and replace if there are any deviations
Remove shift valves in the transmission control block, clean or replace completely if worn
Test the transmission control unit (TCM) with professional diagnostic software and have it programmed if defective
Check the transmission pump for mechanical damage and replace the entire pump unit if worn

FAQ - Frequently asked questions about DTC P1736

Can I continue driving with error code P1736?

Short journeys are possible, but you should take the vehicle to a workshop as soon as possible. The EOBD error code P1736 can lead to serious transmission damage if it is ignored.

How much does it cost to repair error code P1736?

The repair costs vary between 200-2000 euros, depending on the cause. A simple oil change costs around 200-300 euros, while replacing the transmission control unit can cost up to 2000 euros.

How can I delete the P1736 code myself?

You can delete the DTC with an OBD scanner, but the fault code will return if the root cause has not been rectified. A professional diagnosis is therefore essential.

Is fault code P1736 the same for all manufacturers?

No, P1736 is a manufacturer-specific code and can have different meanings depending on the vehicle brand. The exact definition depends on the respective manufacturer.

How often does error code P1736 occur?

This code mainly occurs in vehicles with higher mileage, typically from 150,000 kilometers, when wear parts in the transmission reach the end of their service life.

Can bad transmission oil cause code P1736?

Yes, contaminated or insufficient transmission oil is a common cause of this error code. Regular oil changes can often prevent the problem.

Vehicles in which error code P1736 occurs most frequently

Error code P1736 is a manufacturer-specific DTC that indicates problems with the transmission control unit and can occur in various automatic transmissions, but is most common in the following vehicles:

Ford: Focus, Fiesta, Mondeo, Kuga (2005-2018)
Mazda: Mazda3, Mazda6, CX-5, CX-7 (2004-2017)
Volvo: S60, V70, XC60, XC90 (2003-2016)
Jaguar: X-Type, S-Type, XF (2002-2015)
Land Rover: Freelander, Discovery, Range Rover Evoque (2004-2018)
Lincoln: Town Car, Navigator, MKZ (2003-2017)
Mercury: Grand Marquis, Montego, Milan (2005-2011)
If code P1736 occurs in your vehicle, you should first check the transmission oil level and have the oil changed if necessary. As this is a manufacturer-specific error code, a professional diagnosis at a specialist workshop is recommended to avoid costly consequential damage to the transmission. Do not ignore this EOBD code, as it can lead to complete transmission failure.

How to change front wheel bearing on MERCEDES-BENZ M W163 TUTORIAL | AUTODOC

151K views

Published on: 26/07/2018
How to change fuel filter BMW 3 (E90) [TUTORIAL AUTODOC]

241K views

Published on: 17/04/2019
How to change Front wheel bearing on VW GOLF 4 TUTORIAL | AUTODOC

177K views

Published on: 26/07/2018
How to change a rear brake pads FORD FOCUS 3 TUTORIAL | AUTODOC

169K views

Published on: 27/07/2018
How to change pollen filter / cabin filter on AUDI A6 (C6) [TUTORIAL AUTODOC]

150K views

Published on: 25/10/2019
How to change engine thermostat on PEUGEOT 207 [TUTORIAL AUTODOC]

147K views

Published on: 09/12/2020
How to change fuel filter NISSAN X-TRAIL T30 TUTORIAL | AUTODOC

139K views

Published on: 27/07/2018
How to change front wheel bearing TOYOTA YARIS XP10 TUTORIAL | AUTODOC

120K views

Published on: 26/07/2018

How to change serpentine belt on MERCEDES-BENZ A-Class (W169) – replacement guide

Free download PDF
1.38 MB
How to change engine oil and filter on BMW 1 Hatchback (F20) – replacement guide

Free download PDF
1.62 MB
How to change engine thermostat on VW Golf VI Hatchback (5K1) – replacement guide

Free download PDF
4.12 MB
How to change water pump & timing belt kit on Ford Fiesta JA8 – replacement guide

Free download PDF
7.83 MB
How to change front strut mount on AUDI A1 Hatchback (8X1, 8XK) – replacement guide

Free download PDF
3.8 MB
How to change water pump & timing belt kit on Peugeot 307 SW – replacement guide

Free download PDF
7.01 MB

Want to get more useful information?

Ask questions or share your repair experience on the car forum. Subscribe to updates so you don't miss out on new guides.

Ask on the forum

How to Order Car Parts Online: Avoid These 5 Common Pitfalls

4K views

Published on: 10/03/2022
How to remove rust | AUTODOC tips

27K views

Published on: 16/09/2021
7 signs of faulty fuel injectors | AUTODOC tips

10K views

Published on: 09/01/2025
Deep interior cleaning | Car transformation by detailing

7K views

Published on: 05/09/2024