Code
P0207
HUMMER
P — Powertrain
Injector 7 Control Circuit
Views:
UK: 20
EN: 24
RU: 22
AI status
Completed
Completed
100%
Causes
- Open or shorted injector harness (between injector and PCM)
- Corroded, loose or damaged injector connector or terminals
- Failed fuel injector (internal short or open)
- Blown fuse or loss of constant injector feed voltage
- Poor or missing ground for engine/PCM
- Faulty PCM or driver transistor on PCM
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or misfire felt at cylinder 7
- Decreased engine performance, hesitation or stumble
- Hard starting or increased crank time
- Poor fuel economy
- Possible stumble under load or cold start issues
What to check
- Retrieve freeze frame and live data—confirm P0207 and any related codes (P0200–P0208, misfire codes).
- Visual inspection of injector #7 connector, wiring harness, and PCM connector for damage, corrosion, or loose pins.
- Verify battery voltage is present at the injector feed pin with ignition ON.
- Measure injector coil resistance with multimeter (at connector) and compare to spec.
- Back-probe injector control pin while cranking/running to verify switching (pulse) from PCM.
- Perform wiggle test on harness/connectors while engine runs or while monitoring signal to reproduce fault.
Signal parameters
- Injector feed (constant +): ~Battery voltage (approx. 11–14 V with ignition ON).
- Injector coil resistance (typical): high-impedance type ~10–18 Ω; low-impedance type ~2–5 Ω — consult factory spec.
- Control signal: low-side switching by PCM — waveform switches between ~0 V (ground) when energized and near battery voltage when off.
- Pulse width: varies with engine load and rpm — typically a few milliseconds at idle to much longer under load.
- Injector driver impedance (PCM output): low when activated (conducting to ground), high when off; no sustained short to battery or ground.
Diagnostic algorithm
- Read codes and freeze-frame data; note engine RPM, temperature and conditions when code set.
- Visual inspection: check connector at injector #7 for corrosion, bent pins, water intrusion, or damaged wiring; repair obvious damage.
- Check fuse(s) and relay(s) related to fuel injection/PCM power circuit.
- With ignition OFF disconnect connector and measure injector coil resistance across terminals; compare to spec. If out of range, replace injector.
- With ignition ON (engine OFF) verify battery voltage at the injector feed terminal. No voltage indicates supply or fuse/relay issue.
- Start engine or crank while back-probing the injector control terminal. Use a digital scope or multimeter (set to frequency or duty where possible) to confirm pulsed ground switching by PCM. Look for clean square pulses; absence indicates driver or wiring fault.
- If pulse is present but injector not functioning, bench-test or swap injector with a known-good unit to determine if injector is faulty. If code follows injector, replace injector.
- If no pulse at PCM connector, check continuity/resistance between injector control pin and PCM pin; inspect for shorts to battery or ground. Repair wiring as required.
- If wiring is good and PCM output remains absent or stuck, test other PCM outputs and grounds. Replace PCM only after eliminating wiring and injector faults.
- After repairs clear codes, perform test drive and verify no return of P0207 and that misfire/fuel delivery symptoms are resolved.
Likely causes
- Damaged or corroded connector at injector #7
- Broken or shorted low-side control wire between injector and PCM
- Failed injector coil (open or short)
- Poor ground or low battery supply to injector feed
- Intermittent connector/wiring fault
Fault status
Status
P0207 — Injector #7 Control Circuit: PCM detected a fault in the electrical control circuit for injector 7 (open, short to ground, short to battery, high resistance, or intermittent).
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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