P216B

Code

Generic P — Powertrain

Fuel Injector Group E Supply Voltage Circuit Low

Brand: Generic

Type: P — Powertrain

Views: UK: 15 EN: 29 RU: 23

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Blown or weak fuse in the injector power/feed circuit
Faulty fuel injector power relay or driver
Open or high‑resistance wiring/connectors in the injector supply circuit (corrosion, pin damage, poor crimp)
Short to ground on the injector supply lead
Poor battery or charging system voltage (low battery, bad alternator/charging)
Internal PCM/ECM fault (supply driver or reference circuit failure)

Read freeze frame and stored data with a scan tool — note battery voltage and engine conditions when code set
Check battery resting and cranking voltage (expected ~12.2–12.8 V at rest; >10 V while cranking)
Inspect fuses and relays for the fuel injector/injector feed circuit; replace suspect items
Visually inspect the wiring harness and connectors for group E injectors for corrosion, pin damage, chafing, or repairs
Measure supply voltage at the injector feed pin (key ON, engine OFF) and compare to battery voltage
Measure injector coil resistance for each injector in group E and compare to factory spec and to other injectors

Expected supply (feed) voltage at injector harness: ~11–14.5 V (key ON, engine OFF; similar to battery voltage)
Injector coil resistance (typical ranges): high‑impedance 10–18 Ω, low‑impedance 2–6 Ω — check vehicle spec
Injector driver behavior: low‑side switching (PCM pulses driver to ground) with pulse width varying by load (~1–20 ms typical depending on engine conditions)
Peak injector current: can be up to several amps for low‑impedance injectors — measure with appropriate tools
If supply measures significantly lower than battery or drops when injectors are commanded, suspect short/high load on feed

Verify code and capture freeze frame data with scan tool. Check for other related codes.
Check battery state and charging system. Charge or replace battery if low; verify alternator output.
Inspect and verify fuses and relays related to fuel injectors. Replace any blown fuse and retest.
With ignition ON (engine OFF), back‑probe the injector power feed connector for group E and measure voltage. Compare to battery. If low, trace feed back toward fuse/relay/PCM.
Visually inspect connectors and wiring for group E injectors. Repair any damaged insulation, corrosion, or poor pin fit.
Measure individual injector coil resistances for group E. If one or more injectors show abnormally low resistance (short) or open, remove and bench‑test/replace injector(s).
Command injectors on and observe voltage/current waveform with a lab scope if available. Look for abnormal voltage drop, excessive current draw, or missing pulses.
If wiring and injectors check good but supply still low, check driver outputs and PCM power/ground circuits. Verify PCM ground(s) and supply voltages.
If PCM is suspected after thorough wiring and component checks, consult manufacturer procedures before replacing PCM — reprogramming or configuration may be required.
Clear codes and perform a test drive to confirm repair. Re-scan to ensure code does not return.