P0215
PowertrainEngine Shutoff Solenoid
The ECU watches the electrical circuit that drives the engine shutoff solenoid, and when the voltage or feedback it sees doesn't match what it commanded, it logs P0215. That solenoid is the bit that cuts fuel to a diesel injection pump when you turn the key off, so the computer is basically saying it can't trust whether the engine will stop when told. On older diesels with a mechanical pump this is a known weak spot, and it tends to show up as a car that's a pain to start or, in the worst cases, one that keeps running with the key out.
ⓘ Information only. This page provides general educational information about fault code P0215. We do not assess the urgency or safety implications of any specific fault. That requires in-person diagnosis by a qualified mechanic. Full terms.
Recommended next steps
Whether a fault is urgent, drivable, or routine depends entirely on the cause on a specific vehicle, and that can only be determined by a qualified mechanic with diagnostic equipment. If a warning light is illuminated, the most reliable next step is professional diagnosis.
What does P0215 mean?
P0215 is a Powertrain (engine, transmission, fuel system) fault code. It indicates: Engine Shutoff Solenoid.
This is a standardised OBD-II code. The technical definition is the same regardless of the make or model of vehicle, although specific causes and symptoms can vary between vehicles.
Symptoms commonly associated with this code
Symptoms that drivers often report alongside this code. Not all may apply to every case:
- • Engine cranks but is reluctant to start, or won't fire at all on a cold morning
- • Engine carries on running for a few seconds after you've switched off, sometimes called dieseling
- • Random stalling while driving or at idle with no warning
- • Lumpy, uneven idle that comes and goes
- • Engine warning light on the dash
- • The odd dip in fuel economy on some cars
Possible causes
Causes commonly associated with P0215, listed in approximate order of typical investigation. The actual cause on a specific vehicle can only be confirmed by professional diagnosis.
- 1. Shutoff solenoid itself sticking or failed, the usual culprit on older diesels. The plunger gums up or the coil goes open circuit
- 2. Corroded or chafed wiring in the solenoid circuit, common where the loom runs near the engine and cooks over the years
- 3. Loose or dirty connector right at the solenoid, a five minute fix if you catch it
- 4. Failed relay feeding power to the injection pump, which can knock out the solenoid supply along with it
- 5. Blown fuse on the solenoid control circuit, worth ruling out before you touch anything pricey
- 6. Faulty ECM, rare and only after everything else checks out clean
How mechanics typically diagnose
A typical diagnostic sequence used by mechanics, provided here for educational reference only. Diagnostic work should be performed by a qualified mechanic with the appropriate tools and training.
- 1. Pull every stored code first. P0215 alongside P0087, P0088 or a pump code tells a different story than P0215 on its own, and that changes where you point the spanner
- 2. Get to the solenoid connector and check it physically. Unplug, look for green corrosion and bent pins, give it a wiggle with the engine running to see if anything changes
- 3. Measure the solenoid resistance with a multimeter and compare against the spec for the car. A reading way out or an open circuit means the solenoid is done
- 4. Check the fuse and the pump relay. Swap the relay for an identical one from elsewhere in the box and see if the fault clears
- 5. Back-probe the solenoid circuit for voltage when the key is on. No power getting there points at wiring or the relay rather than the solenoid
- 6. If the electrics all test fine, pull the solenoid and check it mechanically for a sticking plunger before condemning anything else
Common questions about P0215
Can I keep driving the car like this? +
I'd not make a habit of it. The risk with P0215 is the engine cutting out on you without warning, which is no fun in the outside lane of the motorway or pulling out of a junction. The flip side, where it won't shut off with the key, is mostly an annoyance but it points to the same dodgy circuit. Short hops to get it diagnosed are one thing, but don't rely on it for a long run until you know which fault you've got.
Is this going to fail my MOT? +
The code on its own isn't a direct fail, but if the engine warning light is lit when the tester looks at the dash, that's an automatic fail on the MIL check now. Diesel emissions testing has also tightened up, so if the fault is messing with how the engine runs you could trip the smoke test too. Sort the underlying cause, clear the light, and drive a few cycles to make sure it stays off before you book it in.
What's it likely to cost to put right? +
Depends entirely on which end of the problem you've got. A fuse, a relay or cleaning up a connector might be £40 to £100 at an independent. A replacement solenoid fitted usually lands somewhere in the low to mid hundreds, more if the loom needs repairing. A diesel specialist or a decent indie will be a good chunk cheaper than a main dealer for this, and the labour to get at the pump is where most of the bill comes from.
How do I work out which of these it actually is on my car? +
Start at the connector, because corrosion and loose plugs cause a lot of these and cost nothing to find. Wiggle test it with the engine running. If that's clean, ohm the solenoid out against spec, an open or silly reading means the solenoid. If the solenoid reads fine but there's no power reaching it with the key on, you're looking at the relay, fuse or wiring instead. Only after all that comes back good would I start thinking about the ECM.
Information only, not professional advice
The information on this page is provided for general guidance and educational purposes only. It is not a substitute for diagnosis or repair advice from a qualified mechanic. Always verify any fault before paying for repairs. carfaultcodes.co.uk accepts no liability for decisions made based on this information. Full terms →