The 6L80 throws specific DTCs that tell you exactly what is failing. Pull codes first, fix the right thing, save money. Here is the cheat sheet.
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Most common 6L80 DTCs
P0700 - TCM Reporting Trans Code
- Generic "TCM has set a code"
- NOT a diagnostic in itself
- Pull TCM-specific codes next
P0741 - TCC Stuck Off
- Most common 6L80 code
- Causes: TCC solenoid bad, fluid burnt, converter clutch worn
- Read our 6L80 TCC solenoid guide
- Fix cost: $80-$700 depending on root cause
P0776 - PCS2 Stuck Off
- Shift solenoid for 1-2 or 3-4 stuck
- Symptom: harsh shift or missed gear
- Fix: solenoid pack replacement
- Read our 6L80 solenoid pack guide
P0796 - PCS3 Stuck Off
- Shift solenoid for higher gears stuck
- Same fix as P0776
- Often appears with multiple PCS codes
P0868 - Line Pressure Low
- Pump pressure below spec
- Causes: stator support wear, pump body wear, fluid level
- Fix: pump/stator service ($400-$1,500)
- Read our 6L80 stator support
P0716 - ISS Range/Performance
- Input speed sensor erratic
- Fix: replace sensor ($40-$80)
P0722 - OSS No Signal
- Output speed sensor failed
- Symptom: no speedometer, limp mode
- Read our 6L80 OSS guide
P0894 - Trans Component Slipping
- TCM detected slip in a gear ratio
- Causes: worn clutch pack, low pressure
- Often comes with P073X gear ratio codes
P0731-P0736 - Gear Ratio Incorrect
- P0731: 1st gear ratio
- P0732: 2nd
- P0733: 3rd
- P0734: 4th
- P0735: 5th
- P0736: 6th (or reverse on some)
- Indicates clutch slip in that gear
- Fix: rebuild required
How to read 6L80 codes
OBD2 scan tool (basic):
- Reads P0700 + generic codes
- Limited TCM access
GM-specific scanner:
- Tech 2 or modern equivalent (Snap-on, Autel)
- Reads all TCM codes
- Live data for solenoid commands
HP Tuners / EFILive:
- Full TCM read
- Real-time monitoring
- Best for tuning shops
Common code combinations
P0700 + P0776 + P0796:
- Multiple solenoids failing
- Replace full solenoid pack (not individual)
P0700 + P0741:
- TCC issue
- Check TCC solenoid + converter
P0700 + P0868:
- Line pressure problem
- Stator support or pump wear
P0700 + multiple gear ratio codes:
- Trans needs rebuild
- Multiple clutch packs slipping
What NOT to do
- Do not clear codes without fixing root cause (they will return)
- Do not replace torque converter for P0776 (wrong fix)
- Do not rebuild trans for P0722 (cheap sensor fix)
- Do not assume P0700 alone means trans failure
Cost by code category
Cheap fixes ($40-$300):
- P0716, P0722 (sensors)
- P0868 if just low fluid
Mid-range fixes ($400-$1,400):
Rebuild required ($2,200-$4,400):
Service Fast Learn after any code
- Required after solenoid pack replacement
- Required after fluid change
- Recalibrates TCM adapt values
- Critical for shift quality
Need 6L80 solenoids, sensors, or rebuild parts to fix DTCs? Shop our 6L80 catalog. OEM solenoids, sensors, complete rebuild kits. Free shipping over $70.
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