P216E

Code

Generic P — Powertrain

Fuel Injector Group F Supply Voltage Circuit Low

Brand: Generic

Type: P — Powertrain

Views: UK: 19 EN: 29 RU: 23

AI status

Completed

ready

Completed 100%

Page language: EN

Weak or discharged battery
Corroded or loose battery terminals
Blown fuse for injector supply or EFI/ignition relay failure
Open, short to ground, or high-resistance wiring in the injector group F supply circuit
Corroded or loose connector(s) at injector group F or related harness
Poor or high-resistance chassis/engine ground(s)

Use a scan tool to read freeze-frame and live data for injector group F and battery voltage
Check battery voltage with engine off and key ON (expected ~12.4–12.8 V resting; >11 V while cranking is typical)
Visually inspect battery terminals, ground straps and main power connections for corrosion or looseness
Inspect fuses and relays related to fuel injectors / PCM power; test or swap known-good relay
Visually inspect wiring and connectors for chafing, corrosion, broken pins, or water intrusion at injector group F harness
Backprobe the injector group F supply pin(s) with key ON and measure voltage (should be near battery voltage)

Expected injector group supply voltage (Key ON, no load): near battery voltage ≈ 11.5–14.5 V (typical)
Typical voltage while cranking: may drop but should remain above safety threshold (often >9–10 V)
Voltage threshold interpreted as low varies by manufacturer (code set point typically several volts below battery)
Continuity/Resistance: supply wire continuity should be low (single-digit ohms); ground points should show low resistance to chassis (
No parasitic short: resistance from supply wire to ground with power removed should be high (megaohm range)

Verify complaint and record freeze-frame data and the conditions under which the code set
Check battery state of charge and terminal condition; clean and tighten battery and chassis ground connections
Inspect and test relevant fuses and the fuel/IGNition/ECU power relays; replace any blown or suspected-faulty relay and re-test
Backprobe the injector group F supply terminal with key ON and measure voltage; compare to battery positive at the same time to detect voltage drop
If voltage is low, trace wiring from the supply fuse/relay to the injector group connector — inspect for damage, corrosion, open circuits or shorts to ground; repair wiring/connectors as needed
Perform wiggle and stress tests on harness while monitoring supply voltage to reveal intermittent faults
Check continuity from injector supply pin back to the fuse/relay and check for shorts to ground (power removed)
Inspect and test associated grounds (engine block, harness ground straps); clean and tighten grounds if high resistance is found
If wiring and power/grounds are good, disconnect injectors and verify PCM driver operation per factory procedure; consider PCM/ECM swap only after ruling out wiring and power/ground faults
After repairs, clear DTCs, perform functional test and road test to ensure the code does not return

Blown or intermittent fuse protecting injector group F
Faulty EFI/IGN relay or relay control circuit
Connector corrosion or bent pins at injector group F connector
Damaged supply wire (short-to-ground or high resistance) between relay/fuse and injector group
Bad ground at engine or harness ground strap
PCM output/driver failure (if wiring and power/ground check good)