4-5 Shift Malfunction
What it means
The transmission control module (TCM) has found that the shift from fourth to fifth gear did not happen correctly. This code appears on transmissions with five or more gears, and drivers usually notice it on highways as higher engine speed than usual.
Symptoms5
- No shift or a late shift into fifth on the highway.
- High engine speed and higher fuel use at high road speeds.
- Slipping or a sudden RPM flare during the shift.
- Transmission entering limp mode in some cases.
- Check engine light on.
Possible causes6
- Low or old transmission fluid.
- Weak or sticking shift solenoid linked to this shift.
- Sticking shift valve in the valve body.
- Worn clutch or band that applies fifth gear.
- Internal leak in the fifth gear clutch circuit.
- Incorrect speed sensor readings or outdated computer software (less common).
How to diagnose5
- Check fluid level, color and smell.
- Read all codes; fifth gear ratio codes such as P0735 or solenoid codes guide the diagnosis.
- Watch commanded and actual gear and input and output speeds on a scan tool on the highway.
- Use service information to find the solenoid and clutch responsible for the shift, and test the solenoid.
- Have the fifth gear clutch circuit pressure measured, and inspect the pan for friction material or metal.
How to fix6
- Top up with the correct fluid, or change it and the filter.
- Update the computer software and run the shift relearn if available.
- Replace the responsible shift solenoid if proven faulty.
- Repair or replace the valve body if the shift valve is sticking.
- Repair the fifth gear clutch or rebuild the transmission if wear is proven.
- Clear the codes, then road test on a highway and confirm the shift into fifth and no returning code.
Repair cost
In Saudi riyals; the highlighted part is the expected range for this fault.
The cost is low when fluid, a solenoid or a software update is the cause, and rises sharply if the fifth gear clutch or the transmission needs a rebuild.
Prices are rough estimates for common cars at independent workshops and vary with the car and the source of the part.
Prices last updated: September 2026
Frequently asked questions
Can this code appear on a four-speed transmission?
No, it applies to transmissions with five or more gears; if it shows on a four-speed car, confirm the reading with a suitable scan tool.
Why does fluid temperature rise with this fault?
Driving in a lower gear at higher RPM, plus any clutch slipping, adds heat to the fluid, and excess heat speeds up transmission damage.
This guide is for information only and does not replace an inspection by a qualified technician. If the fault involves brakes, steering, engine temperature, electrics or refrigerant, do not attempt the repair yourself.
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