Powertrain
generic / SAE
P0899
Transmission Control System MIL Request Circuit High
Voltage on the transmission control system MIL request circuit is above the expected window. Wire shorted to B+ or driver open.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number8 / 99
Possible causes
- Wire shorted to B+ high
- Driver fault open medium
- Connector pins corroded - high contact resistance low
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 80–400 €
- Estimated time: 0.5–2 h
- Component: mil request circuit
- Component: tcm
- MIL / check engine light
Sources
References
sae:J2012