Error code P1735 is displayed and the check engine light is on - what does this mean?
The DTC P1735 is a manufacturer-specific error code that mainly occurs in General Motors vehicles and indicates a problem with the automatic transmission, specifically with the 2-3 shift valve function. The OBD system detects a malfunction in the transmission control module or in the hydraulic components of the automatic transmission.
What causes can this error code have?
- Defective 2-3 shift valve in the transmission valve body
- Worn or damaged transmission coils (solenoids)
- Low transmission oil level or contaminated ATF oil
- Defective wiring to the transmission control module
- Faulty pressure control valves in the hydraulic block
- Damaged transmission valve body
- Defective transmission control module (TCM)
- Clogged transmission oil filter
- Mechanical wear of the transmission belts or clutches
What symptoms occur in parallel with fault code P1735?
- Shifting problems: The transmission does not shift from 2nd to 3rd gear or shifts jerkily
- Emergency running program: The vehicle remains in emergency running mode and only uses a few gears
- Increased engine speed: The engine revs higher than normal at a constant speed
- Delayed gear changes: The automatic transmission reacts sluggishly when changing gear
- Transmission slip: Noticeable increase in engine speed without corresponding acceleration
- Irregular shifting behavior: Unpredictable or hard gear changes
How to fix the problem of trouble code P1735?
- Repairing trouble code P1735 requires a systematic diagnosis of the transmission components.
- Check the transmission oil level and quality: Check ATF oil and change if necessary, as contaminated or insufficient oil impairs the hydraulic function
- Read out and test the transmission control module: Check the TCM for other error codes and check the power supply and earth connections
- Replace shift valves and solenoids: Replace defective 2-3 shift valves or transmission solenoids in the valve body
- Check wiring to the gearbox: Check cable connections for corrosion, breaks or loose plug connections and repair
- Overhaul the transmission valve body: Remove hydraulic block, clean and replace worn valves or seals
- Completely change the transmission filter and oil: Remove the oil pan, replace the filter and fill in fresh ATF oil
FAQ - Frequently asked questions about DTC P1735
Can I continue driving with error code P1735?
Continuing to drive with code P1735 is only possible to a limited extent. The transmission is operating in emergency mode, which means that only a few gears are available. Prolonged driving can lead to serious damage to the transmission.
How much does it cost to repair fault code P1735?
The repair costs for fault code P1735 vary between 200-1500 euros. A simple oil change costs around 200-300 euros, while a transmission overhaul can cost up to 1500 euros.
Is fault code P1735 the same for all vehicle brands?
No, P1735 is a manufacturer-specific code that is mainly used by General Motors (Chevrolet, GMC, Cadillac). Other manufacturers have their own codes for similar transmission problems.
How do I know if the problem with code P1735 is severe?
If the vehicle still shifts all gears and only jerks occasionally, the problem is less severe. If the emergency running mode or gear failures persist, you should visit a workshop immediately.
Can I delete the EOBD error code P1735 myself?
You can clear the code with an OBD scanner, but it will return if the underlying problem has not been resolved. Professional diagnosis is required.
What tools do I need to diagnose P1735?
For diagnostics, you will need an OBD2 scanner, a multimeter for voltage measurement and ideally a transmission pressure tester for hydraulic diagnostics.
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