P0803 Fault Code: What It Means and What To Do

What does P0803 mean?

P0803 is logged when your car's control module detects: 1-4 Upshift (Skip Shift) Solenoid Control Circuit Malfunction. It's classed as a drivetrain fault.

P (powertrain) codes relate to the engine, gearbox and emissions systems. The P0 prefix means it's a generic code, so it means the same thing on every make of car.

The drivetrain carries power from the gearbox to the wheels — including four-wheel-drive transfer cases, differentials and their controls. Faults here can affect traction, cause noises or vibration, or disable four-wheel drive.

Is it safe to drive with P0803?

Yes, in most cases. This is unlikely to be a safety issue, but it's worth fixing — a warning light that stays on can hide newer faults and may fail your MOT.

This is a general rating for the code. The real risk depends on your car and the symptoms you're getting — a tailored explanation will take your make, model, engine and MOT history into account.

What to do next

• Note any symptoms — when the light came on, and whether the car feels, sounds or smells different. It helps a garage narrow down the cause quickly.
• Check for other codes — faults often log several related codes at once, and the first one is usually closest to the root cause.
• Don't just clear it — the code will usually come back if the fault is still there, and clearing it wipes the freeze-frame data a garage uses to diagnose it.
• Get it diagnosed — a garage diagnostic check typically costs £50–£100 in the UK, and is often deducted from the repair if you go ahead with them.

A dashboard warning light that stays on — such as the engine management or ABS light — is an MOT failure, so get it fixed before your next test.