Transmission Control System Range/Performance
What it means
The transmission control module (TCM) has detected that the transmission control system is not performing as expected, such as an unexpected response to commands or implausible sensor values. The exact setting conditions vary by manufacturer, so read this code together with any other transmission codes and the manufacturer information.
Symptoms4
- Check engine light on.
- Harsh, delayed or erratic shifts.
- Transmission sometimes entering limp mode.
- Slipping or a sudden rise in engine speed during shifts.
Possible causes6
- Low or degraded transmission fluid.
- A faulty shift or pressure control solenoid, or a valve body problem.
- Implausible readings from the speed sensors or fluid temperature sensor.
- Outdated or incompatible TCM software.
- Internal clutch wear or low hydraulic pressure.
- A fault in the TCM itself (less common).
How to diagnose5
- Read all engine and transmission module codes, and deal with the specific codes before this general one.
- Check the transmission fluid level and condition using the manufacturer procedure.
- Watch input and output speeds, commanded gear and line pressure data if available during a road test.
- Look for manufacturer service bulletins or software updates for this code.
- Have a hydraulic pressure test done if there is slipping or harsh shifting while the sensors test good.
How to fix5
- Correct the transmission fluid level, or change the fluid if it is degraded.
- Repair damaged wiring or connectors at the transmission.
- Update the TCM software if an update exists for the problem.
- Replace the faulty solenoid or sensor, or the valve body if it is proven faulty.
- Clear the codes, then road test and confirm the code does not return.
Repair cost
In Saudi riyals; the highlighted part is the expected range for this fault.
The cost is low when fluid or a software update solves it, and rises when solenoids, the valve body or internal transmission repairs are needed.
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
Does this code mean the transmission is ruined?
Not necessarily. Low fluid, a sensor or software is often to blame, so check these before considering internal transmission repairs.
Why does this code mean different things on different cars?
Because the generic definition covers the performance of the whole system, and each manufacturer sets its own conditions for it, so it must be read with the manufacturer data and other codes.
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What was wrong? (optional)
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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