P080D code meaning
Upshift/Skip Shift Solenoid Control Circuit High
Powertrain system Generic code P08xx codes Check engine light
What P080D means
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. P080D means the control line is shorted to positive: with the low-side driver on, the line should be pulled to ground but reads high (GM: 0.5 Ω or less to the supply). The solenoid cannot be energized and the driver is protected or switched off. GM checks it only with the driver on, from 9 V (2015/16: 11–32 V) and above 250 rpm, 5 of 6 samples of 250 ms, type B with the MIL after two trips in all tables from 2015 to 2019. Without power the solenoid does not lock, so 1 to 2 stays free.
P080D at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2.5 hours
- Clears after repairAfter a drive cycle
Symptoms of P080D
- Check engine lamp after two trips
- 1-4 lockout not working
- Otherwise no change in driving
Common causes of P080D
- Most likelyControl wire shorted to battery voltage (damaged harness)
- PossibleSolenoid coil with shorted turns (resistance near zero)
- PossibleSubstitute resistor ('eliminator') with too low a value
- Less likelyEngine module driver faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Skip shift solenoidSolenoid wiringEngine control module
What each part of P080D means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 8 | Area: transmission. |
| 0D | The exact fault in that area. |
What to do next
- Note P080D and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P080D
What does P080D mean?
P080D means "Upshift/Skip Shift Solenoid Control Circuit High". 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). It is a generic code, so it means the same on every make.
Is it safe to drive with P080D?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P080D fail an emissions test?
Yes, it can. P080D is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P080D to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P080D clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.