What P07A0 means
The 'friction element slip' codes monitor a clutch that is commanded locked in a power-split hybrid transmission: the module calculates its slip from electric motor, engine and output speeds (target 0 rpm) and flags slip above a threshold for a minimum time, with sufficient line pressure and clutch torque; from 2016 GM also flags a calculated friction energy threshold at once.
How the engine computer detects it
The letter matches the manufacturer's clutch number. P07A0 concerns clutch 7. No manufacturer document available to us uses it – the documented hybrids (GM Two-Mode, Volt, Malibu Hybrid, CT6 plug-in, Chrysler Pacifica PHEV) have at most five monitored clutches. The description follows the family; clutch 7 would be the seventh friction element.
Written from public technical sources and not yet checked by a mechanic. How we write these pages
Symptoms
- Check engine light or 'service hybrid system' message
- Limp mode with reduced power or restricted drive mode
- Slipping, engine speed rises without drive
- Jolt when the engine starts or stops
Common causes
- Clutch G plates worn or glazed Most likely
- Too little line pressure: low or aged fluid, filter, auxiliary oil pump or blocked pressure orifice Possible
- Pressure or shift valve of clutch G or valve body sticking Possible
- Module software (false setting) Less likely
- Faulty speed signals (motor resolver, output) Less likely
How to diagnose P07A0
- Read every stored code with an OBD-II scanner. If misfire or fuel trim codes are there too, fix those first: they often cause this one.
- Inspect the parts involved: transmission clutches, transmission valve body, auxiliary transmission oil pump, hybrid control module.
- Work through the causes above from most to least likely, cheapest checks first.
- Clear the code and drive a full drive cycle to confirm the repair held.
Reading the code
- P
- Powertrain
- 0
- Generic (SAE) code
- 7
- Transmission
- A0
- Specific fault
Questions drivers ask
Can I drive with code P07A0?
If the car shifts normally, drive gently to a shop. If it's stuck in one gear, slips, shifts harshly or won't move out of Park, don't drive it: have it towed.
Will my car pass an emissions inspection with P07A0?
Probably not in states that test vehicles with an OBD-II scan: an emissions-related code that keeps the check engine light on is usually an automatic fail. Rules differ by state and county, so check yours.
This page is general information, not a substitute for a professional diagnosis. Repair costs are rough estimates for parts and labor and vary by vehicle and region.