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Home / DTC / P1208 — Cylinder 8 Fuel Injector Circuit Electrical Malfunction

P1208 — Cylinder 8 Fuel Injector Circuit Electrical Malfunction

Detailed page for trouble code P1208.

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P1208

VOLKSWAGEN P — Powertrain

Cylinder 8 Fuel Injector Circuit Electrical Malfunction

Brand: VOLKSWAGEN
Type: P — Powertrain
AI status
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Page language: EN

Causes

  • Open circuit in injector wiring (broken wire, connector pin pushed out)
  • Short to ground or short to battery in the injector circuit
  • Corroded/poor connector at the injector or wiring harness
  • High circuit resistance (poor contact, damaged insulation)
  • Faulty fuel injector (internal short or open)
  • Faulty engine control module (ECM) driver or connector

Symptoms

  • Check Engine Light / MIL illuminated with P1208 stored
  • Rough idle or engine misfire primarily on cylinder 8
  • Reduced engine power and drivability issues
  • Increased fuel consumption and emissions
  • Occasional intermittent cut-out or stumbling under load

What to check

  • Read stored and pending codes and freeze-frame data with a capable scan tool
  • Confirm ignition and fuel trims and look for misfire counters for cylinder 8
  • Visually inspect injector connector, wiring harness and nearby routing for damage, corrosion, water intrusion and pin condition
  • Wiggle test wiring and connectors while monitoring live data to reproduce fault
  • Measure resistance of injector 8 at the connector (compare to factory spec and to other cylinders)
  • Back-probe injector connector while cranking/running to verify injector pulse signal and supply voltage

Signal parameters

  • Injector resistance (cold) — check OEM; typical ranges: low-impedance injectors ~2–4 Ω, high-impedance ~10–16 Ω (confirm with factory spec)
  • Injector supply voltage (key on / running) — approx. battery voltage (typically 11.5–14.5 V) at the fused supply rail
  • Injector control: ECU provides a pulsed ground or positive drive; pulse width varies with load/engine speed (idle pulses often a few ms, increasing with demand)
  • No injector pulse when engine cranks indicates missing control; constant battery on or short to battery indicates stuck-on condition
  • Normal waveform: clean square/rectangular pulse on the control side with stable supply voltage; noise, droop or absence suggests wiring/driver problem

Diagnostic algorithm

  1. Record DTC(s), freeze-frame and live data then clear codes to verify recurrence.
  2. Perform a visual inspection of the cylinder 8 injector connector and harness for damage, corrosion, melted insulation or loose terminals.
  3. Inspect and test the fuse(s) and relay(s) for the fuel injector supply circuit; replace if faulty.
  4. Measure injector 8 coil resistance at the connector with the harness disconnected; compare to factory specification and to another injector of the same type.
  5. Check supply voltage at the supply pin of injector 8 with connector connected (back-probe) — should be approx battery voltage with key on and while cranking.
  6. Back-probe the injector control pin while cranking or running and verify ECU pulses using a scan tool or oscilloscope. No pulse suggests ECU or wiring open; constant voltage suggests short to battery.
  7. Perform a continuity test from the injector connector pins to the corresponding ECM connector pins with ignition off to locate opens/shorts. Also check for shorts to ground and battery.
  8. Wiggle test the harness/connector while monitoring live data to detect intermittent faults.
  9. Swap injector 8 with another cylinder’s injector (same type) to determine whether the fault follows the injector or stays with cylinder 8 (note: only swap if compatible and safe).
  10. If waveform/device testing implicates the ECM driver pin, inspect the ECM connector, grounds and harness paths; consider ECM bench testing or replacement only after eliminating wiring and injector faults.
  11. Repair identified wiring/connector faults, replace faulty injector or fuse/relay as required, then clear codes and test drive to confirm repair.

Likely causes

  • Loose or corroded connector at cylinder 8 injector
  • Damaged wiring harness where it routes near exhaust/cengine mounts
  • Injector internal failure (electrical)
  • Intermittent connector contact or pin corrosion
  • ECM driver fault (less common)

Fault status

⚠️ Status
P1208 — Cylinder 8 Fuel Injector Circuit Electrical Malfunction. ECM has detected an open, short, high resistance or intermittent electrical condition on the injector 8 circuit.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

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P0208 P0200 P0201 P0308 P1209
626

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