A fault code doesn’t yet mean the unit or sensor itself is faulty: often it’s the plug and connector leading to it.
Possible causes
- Metering unit (valve or actuator) on the injection pump
- Injection pump connector or wiring
- Dirty fuel or water in the fuel
What you can do yourself
- Check the connector on the injection pump.
- Replace the fuel filter and drain the water from the separator.
Stop and don’t drive on if:
- The Check Engine light is flashing
- The temperature gauge is in the red or the overheating light is on
- The red oil pressure light is on
- Smoke from under the bonnet, a burning or petrol smell
- Strong jerking, knocking from the engine, or the car barely moves
OOleg’s tip: check the connector
Often the cause is simple — there is no contact in the connector (plug). Look at the connector from the back: remove the rubber seal and you will see whether a wire is corroded or has come off completely. Corrosion shows up as green deposits. Ideally, gently pull each wire towards you one at a time: a sound wire stays in place, while a corroded one simply comes off — it needs to be repaired.
Unplug and inspect connectors with the ignition off.
OA case from Oleg’s practice
- Sinotruk 2025 Pre-purchase inspection, mileage 3 500 km. Current GSM/GPS lock codes (U016AF7, U016AF3) came back after clearing — we advised the buyer to demand they be fixed before the deal. The VIN and mileage matched. How it went ↗
On Oleg’s website:Injector cleaning ↗Car wiring repair ↗
The explanation comes from the error code reference in the AvtoElektrik PRO app.