EN

Severity: High Code type: Generic (all makes) ✱

P0216 Code: Injector/Injection Timing Control Circuit

The ECU can't control or confirm injection timing, usually on a diesel with an electronic injection pump.

Unverified: this manufacturer-specific definition comes from a single source or varies by model. Confirm it with a brand-specific scan tool.

Safety first · Consult a professional

  • Fuel vapor is flammable. No smoking or open flames; work outdoors and fix fuel leaks before driving.

At a glance

Severity: 4/5 – High4/5

Severity: High

Meaning
Injector/Injection Timing Control Circuit
System
Fuel & Air Metering · Powertrain
Safe to drive?
With caution
Typical repair cost
$60–$3,500
DIY difficulty
Hard

P0216 is a diesel code in practice. It sets when the engine computer commands a start-of-injection point and either cannot drive the timing control circuit or doesn't see the timing it asked for. On electronically controlled rotary pumps, such as the Bosch VP44 on 24-valve Cummins engines or the DS4 pump on GM's 6.5L, a solenoid inside the pump moves the timing and a pump sensor or the crank signal confirms it, often with a pump-mounted control module doing the switching. On common-rail engines the code is rare, and some manufacturers use it for other injector timing or control faults, so the exact meaning varies: check the definition for your engine. Typical results are hard starting, stalling and reduced power.

Can I keep driving? Stay off the highway until it's diagnosed. A pump losing timing control can shut the engine off without warning, taking power steering and brake assist with it. If it stalls, smokes heavily or knocks loudly, have it towed.

How to read P0216

How to read P0216P10223164
  1. P Powertrain
  2. 0 Generic (SAE)
  3. 2 Fuel & air (injector circuit)
  4. 16 Specific fault

Symptoms

  • Long cranking or no start, often worse when the engine is hot
  • Engine dies while driving and restarts after cooling down for a while
  • Reduced power or limp mode with the check engine light on
  • White or black smoke and a harsher diesel knock when timing is off
  • Surging or rough idle

Possible causes

Ranked by how often each cause is behind this code (editorial estimate).

  1. Failing electronic control module or timing solenoid on the injection pump (for example VP44 or DS4) 32%
  2. Low fuel supply from a weak lift pump, clogged filter or air leak, which starves and overheats the pump 22%
  3. Wiring or connector fault between ECU and pump, including a heat- or fuel-damaged pump connector 15%
  4. Weak battery or poor grounds, so the pump electronics drop out during cranking 12%
  5. Crank or cam signal errors that corrupt the timing reference 10%
  6. Engine ECU fault or software problem 9%

Diagnosis step by step

Diagnostic flow: P02161Read every code and the freeze frame2Measure lift pump pressure3Check voltage and grounds whilecranking4Compare desired and actual timing5Inspect the pump connector andharness6Decide on pump or module repair

  1. Read every code and the freeze frame

    Note rpm, coolant temperature and battery voltage when P0216 set, and look for pump communication, crank, cam or low-voltage codes. A cam or crank code alongside it means fixing the reference signal first.

    Tools: OBD-II scanner

  2. Measure lift pump pressure

    Tee a gauge in at the filter outlet or the injection pump inlet. Electronic rotary pumps need positive supply pressure; on VP44-equipped Cummins trucks roughly 10 psi or more at idle is the usual target, and pressure collapsing toward zero under load is a red flag. Replace a clogged filter and look for air in clear lines.

    Tools: Fuel pressure gauge

  3. Check voltage and grounds while cranking

    Battery voltage should stay above about 9.6 V while cranking. Measure the drop between the engine block and battery negative during cranking; more than about 0.3 V means a ground strap needs cleaning or replacing. Pump electronics are very sensitive to low supply voltage.

    Tools: Multimeter

  4. Compare desired and actual timing

    With a scan tool that shows injection timing, compare commanded and actual values at idle and during a quick throttle blip. A large, steady deviation, or actual timing stuck while the desired value moves, points to the pump's timing mechanism.

    Tools: OBD-II scanner

  5. Inspect the pump connector and harness

    Look for a fuel-soaked, cracked or heat-baked connector at the pump. With the engine running, gently flex the harness while watching the timing data; a jump or stall pins down a wiring fault.

    Tools: Flashlight, OBD-II scanner

  6. Decide on pump or module repair

    Only after supply pressure, voltage and wiring check out should the pump or its control module be replaced. On several designs the module can be repaired or relocated separately, and a new pump may need timing set or programming.

    Tools: OBD-II scanner

Where the parts are

Ignition: coils and spark plugs per cylinder – P02161234567
Ignition: coils and spark plugs per cylinder
  1. 1Ignition coil
  2. 2Spark plug
  3. 3Fuel injector
  4. 4Camshaft sensor
  5. 5Crankshaft sensor
  6. 6Engine computer (ECM)
  7. 7Intake manifold

Repair options & costs

RepairDIY?Estimated cost
Replace fuel filter and fix air leaks Yes $60–$200
Replace lift pump No $250–$800
Repair pump connector or harness No $120–$400
Repair, replace or relocate the pump control module No $300–$900
Replace electronic injection pump No $1,500–$3,500

Rough US estimates for parts and labor; shop rates vary by region. Not a quote.

Notes by brand

Dodge

On 24-valve 5.9L Cummins trucks with the Bosch VP44 pump, weak lift pump pressure is a well-known cause of pump failure and timing-related codes. Checking and correcting supply pressure belongs to any VP44 replacement, or the new pump can fail the same way.

Chevrolet

GM's 6.5L turbo diesel mounts the pump driver module (PMD) on the injection pump, where heat shortens its life. Relocating it to a remote heat sink is a common fix for hot stalling and injection control faults.

Emissions / smog test impact

Depends

Whether this matters for a smog check depends on your state: many exempt diesel pickups above a certain weight or age, while others run an OBD check on light-duty diesels. Where OBD testing applies, an active P0216 with the check engine light on fails.

Frequently asked questions

Is P0216 only for diesels?

Almost always. Gas engines have no injection pump with adjustable timing, although a few makers use the code for other injector control problems. If a gas engine reports P0216, look up that manufacturer's definition.

Will a new injection pump fix it?

Only if the pump is the actual cause. Many replacement pumps fail again because the supply side was weak or the battery and grounds were poor. Check lift pump pressure, filters and voltage first.

Why does it stall when hot and restart later?

The pump's electronics are heat-sensitive. As they warm up, a marginal component or cracked solder joint cuts out, stopping injection; once cooled, it works again for a while. That pattern strongly points at the pump module.

Can I keep driving with P0216?

It's risky. The engine can stall abruptly, and badly wrong timing raises combustion pressure, smoke and piston temperatures. Keep it to short, gentle trips to the shop.

Sources