P281D code meaning
Pressure Control Solenoid H Control Circuit Low
Powertrain system Generic code P28xx codes Check engine light
What P281D means
P281D signals that the control line of solenoid H is shorted to ground. In GM's 2016 eight-speed table H is the on/off default valve; the low flag must persist for 0.3 s within 0.5 s and one trip lights the MIL. The 2020 tables extend this to the nine- and ten-speed converter clutch valve, using about 0.5 ohm to ground as the limit and rating it Type A, and add that T87a eight-speed controllers also report an open default valve circuit as P281D, so an interrupted wire can hide behind this code. On the 2023 Corvette dual-clutch box the redundant shutdown valve of the differential is checked while switched on; a voltage below about 1.7 V at the output pin is held for 150 ms before the Type B code is stored.
P281D at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 6 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P281D
- MIL on after a single trip
- Transmission in default gear or fixed pressure mode
- Converter lockup or differential lock unavailable
Common causes of P281D
- Most likelyControl wire of solenoid H shorted to ground
- PossibleOpen default valve circuit reported as low (GM T87a eight-speed)
- PossibleCoil insulation failure inside solenoid H
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Pressure control solenoid hWiring harness
What each part of P281D means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 8 | Area: transmission. |
| 1D | The exact fault in that area. |
What to do next
- Note P281D 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 P281D
What does P281D mean?
P281D means "Pressure Control Solenoid H Control Circuit Low". P281D signals that the control line of solenoid H is shorted to ground. It is a generic code, so it means the same on every make.
Is it safe to drive with P281D?
Drive gently and only to a workshop. With P281D the car can go into limp mode (reduced power) to protect itself.
Will P281D fail an emissions test?
Yes, it can. P281D 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 P281D to fix?
Difficulty: hard. A typical repair takes 1 to 6 hours of work. This is a job for a workshop.
Will P281D clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.