KlaroFault codeP0899
MODERATETransmission Control System MIL Request Circuit High
What this code means
Transmission Control System MIL Request Circuit High.
P0899 is a generic code: it means the same thing on every make. P0899 belongs to family P08xx — Transmission (continued). Its page explains how to read a code and groups all its codes by part.
Type of fault
The control unit reads a voltage on this circuit above its expected range. Usual causes: a broken wire or a poor ground, a short to a supply voltage, or the component itself. As with a low signal, check the wiring and connector before the part.
Gearbox control system
These codes mean the gearbox control unit has recorded a fault and asked the engine control unit to light the warning. They do not say which: the precise code is stored in the gearbox unit.
What you notice
Depends on the real fault: harsh shifts, a gearbox in limp mode, or just the warning light.
How to check it
Read the codes of the gearbox control unit itself with a tool that can access it: that is where the useful code is. Check the fluid level and condition meanwhile.
What to do
Have it checked this week. The car remains usable, but the fault will not clear itself and will fail the roadworthiness test.
Clearing a code switches the light off but repairs nothing: if the fault remains, the code comes back. Clearing a fault code yourself →
How to read this code
- PPowertrain
- 0standardised code
- 8Transmission (continued)
- 99P0899
