Powertrain
generic / SAE
P0802
Transmission Control System MIL Request Circuit/Open
The dedicated MIL request line from the TCM to the ECM (used in older systems where modules used a hard wire to ask for the MIL instead of CAN messaging) is open. The ECM cannot honour TCM-side MIL requests.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number8 / 02
Possible causes
- Open MIL request wire high
- Pin pushed back out of connector body low
- Cracked solder joint inside the module or sensor 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: 0.4–1.5 h
- Component: mil request wire
- Component: tcm
- Component: ecm
- MIL / check engine light
Sources
References
sae:J2012