P0216
PowertrainInjection Timing Control Circuit Malfunction
This is a diesel injection timing fault. The ECU has worked out that the point at which fuel is being injected, or the signal controlling that timing, is off from where it should be. For you that usually means a car that's down on power, can be a pig to start when cold, and often drops straight into limp mode to protect itself. On older mechanical and early electronic diesels it points at a tired injection pump; on more modern common-rail engines it's more often a wiring or sensor problem feeding the pump bad information.
ⓘ Information only. This page provides general educational information about fault code P0216. 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 P0216 mean?
P0216 is a Powertrain (engine, transmission, fuel system) fault code. It indicates: Injection Timing Control Circuit Malfunction.
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 warning light on, sometimes with the car still driving fine, sometimes alongside a real loss of power
- • Noticeably hard to start when cold, long cranking before it catches
- • Lumpy idle or the engine stalling shortly after start-up
- • Limp mode, with speed pegged at roughly 30 mph and no useful throttle response
- • Hesitation or a flat spot when you put your foot down
- • Black smoke from the exhaust and heavier fuel use on some cars
Possible causes
Causes commonly associated with P0216, listed in approximate order of typical investigation. The actual cause on a specific vehicle can only be confirmed by professional diagnosis.
- 1. Worn high-pressure injection pump, common on higher-mileage diesels where the pump can no longer hold timing accurately. This is the expensive end of the fault
- 2. Weak or failing lift (transfer) pump starving the injection pump of fuel, so timing wanders under load
- 3. Blocked or overdue fuel filter restricting flow, a cheap thing that gets overlooked far too often
- 4. Damaged wiring or corroded connectors around the injection pump and timing control circuit, very common on cars that live outside or do salty motorway miles
- 5. Faulty crankshaft or camshaft position sensor feeding the ECU wrong timing reference data
- 6. Air drawn into the fuel system through a leaking pipe, perished seal, or running the tank too low
- 7. ECU software fault or a failed internal driver, rare but it does happen and it's the last thing to suspect
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. Scan the car and read all stored codes plus live data, because P0216 rarely turns up alone. Cam or crank sensor codes (P0335, P0340) sitting alongside it change the whole diagnosis
- 2. Get under the bonnet and check the injection pump wiring and connectors properly, looking for green corrosion, chafed insulation and water in the plugs. This finds a fair share of these before you touch anything else
- 3. Change or at least inspect the fuel filter, and check for air in the system by looking at the clear filter housing or priming bulb where fitted
- 4. Test fuel feed pressure from the lift pump, you're looking for somewhere around 10 to 18 psi, and check the volume it delivers over a timed run
- 5. Check the crank and cam sensors for the correct voltage and resistance against the manufacturer figures, since a lazy sensor mimics a timing fault perfectly
- 6. If the wiring, fuel supply and sensors all check out, and your pump has adjustable timing, verify it against the spec before condemning the pump
Common questions about P0216
Can I sort this one myself on the drive? +
Some of it, yes. Swapping a clogged fuel filter is well within reach for most people and costs £10 to £30 for the part, and it's worth ruling out before anything else. Beyond that you're into reading live data, pressure-testing fuel supply and chasing wiring faults, which needs proper kit. If the diagnosis lands on the high-pressure pump, that's a specialist diesel job and not something to attempt without the right tools and experience.
If I just clear the code, will it stay gone? +
Only if you've fixed whatever set it. Clear a P0216 caused by a tired pump or a corroded connector and it'll light back up within a few starts, often before you've reached the end of the road. Where it sometimes stays off is when the trigger was a one-off, like air in the system after running the tank dry or a battery disconnection. If it returns quickly, treat that as confirmation there's a real fault, not a glitch.
What am I risking if I just keep driving on it? +
Most cars drop into limp mode, so you're stuck at about 30 mph regardless. Pushing on with timing out of range can lean on the injection pump and injectors, and on a diesel those are the parts you really don't want to wreck, since a pump can run well into four figures fitted. If the root cause is fuel starvation, running it that way starves the pump of the diesel that lubricates it. Get it looked at before you put serious miles on it.
How quickly do I need to deal with this? +
Fairly promptly. It won't strand you on the hard shoulder in most cases, but it's not a code to ignore for weeks either. The limp mode alone makes the car a liability on the motorway, and the longer a fuel supply or timing fault runs, the more chance it does damage to the expensive parts. Book it in as soon as you reasonably can, and avoid long high-load runs until it's diagnosed.
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 →