P080BUpshift/Skip Shift Solenoid Control Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- GM's skip-shift (CAGS) on manual gearboxes such as the T56 and TR6060 uses an engine-module solenoid that, at light load, blocks the way from 1st into 2nd so the driver shifts 1 to 4; the 1-4 lamp shows it (P0804). The engine module drives the solenoid with a low-side driver; P0803 is the open circuit. P080B would be the range or performance fault of this circuit: electrically plausible, but outside the expected range for the command – for example a coil resistance outside its window, a partial short or contact resistance. No manufacturer document available to us uses it: GM's tables from 2006 to 2019 check the solenoid only electrically (P0803 open, P080C short to ground, P080D short to positive). CARB requires a functional check of outputs where feasible. The lockout may then work unreliably.
- What you may notice
- Check engine lamp (depends on manufacturer)
- 1-4 lockout works not at all or only sometimes
- Otherwise no change in driving
- Likely causes
- PossibleSolenoid coil with shorted turns or resistance out of range
- PossibleRetrofitted skip-shift eliminator with the wrong value
- PossibleCorroded connector at the gearbox (contact resistance)
- RareControl module or software
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €30 – €250
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.