P281EPressure Control Solenoid H Control Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P281E sets when the line to solenoid H carries supply voltage where the module expects the load to pull it down. GM's 2020 tables cover the converter clutch valve on nine- and ten-speed automatics and the default valve on the eight-speed with the same timing as the low code: 0.3 s within 0.5 s, Type A, one trip. On the 2023 Corvette dual-clutch gearbox the threshold for the shutdown valve of the differential lock rises with battery voltage, from about 0.7 V to 1.1 V at the pin. The same code also covers a valve current that strays from its target and a short to a neighbouring output, which the shutdown test detects and saves, so P281E can appear right after a restart. Look for pinched wires next to supply lines and for water in connectors.
- What you may notice
- MIL on, possibly right after starting
- Converter clutch or differential lock function lost
- Firm shifts in a substitute program
- Likely causes
- LikelyControl wire of solenoid H shorted to a voltage source
- PossibleMoisture in the transmission connector bridging pins
- RareShort between solenoid H and a neighbouring output
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.