P0206
Injector Circuit Malfunction - Cylinder 6P0206 is a generic OBD-II powertrain diagnostic trouble code: Injector Circuit Malfunction - Cylinder 6. It is logged by the engine control unit when the fuel/inj monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.
What P0206 means
P0206 indicates the ECM/PCM detected an abnormal electrical condition on the fuel injector control circuit for cylinder 6. As with the entire P0201–P0208 family, this is an electrical circuit fault: the control module saw unexpected voltage or current on the cylinder 6 injector driver line and logged the code. Cylinder 6 is present on V6, V8, V10, and V12 engines. The injector circuit includes the high-side power feed, the low-side driver inside the PCM, and the injector solenoid coil (typically 12–16 Ω for port injectors).
Common failure points are wiring harness damage near the valve covers — heat and vibration progressively crack insulation — and corrosion at the injector connector plug. On many V8 platforms cylinders 5 and 6 share a common power supply fuse and relay, so checking that shared circuit first can save diagnostic time. Injector coil failures are less common than harness faults but do occur, particularly on high-mileage units or engines that have overheated.
If the MIL is flashing rather than illuminated steadily, an active severe misfire is occurring on cylinder 6 and the vehicle should be parked — continued driving with an active misfire can rapidly overheat and melt the catalytic converter.
Common causes
Most-frequently reported root causes when P0206 is logged.
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1
Wiring harness open circuit or short circuit at or near the cylinder 6 injector — heat, vibration, and chafing against the valve cover are common damage mechanisms.
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2
Corroded, loose, or damaged terminals at the cylinder 6 injector connector.
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3
Blown fuse or failed relay on the injector power supply rail shared by bank 2 injectors.
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4
Injector solenoid coil open circuit or internal short (internal injector failure).
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5
Oil contamination of the wiring loom through a leaking valve-cover gasket.
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6
Poor ECM/PCM ground causing erroneous driver circuit voltage readings.
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7
Failed ECM/PCM driver transistor for the cylinder 6 channel (uncommon; typically results from a sustained harness short-to-ground).
Symptoms drivers notice
How to diagnose P0206
A typical diagnostic flow when this code is present.
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1
Retrieve all stored codes with a scan tool and record freeze-frame data; note any P0306 misfire companion code and which operating conditions triggered the fault.
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2
Inspect the cylinder 6 injector harness and connector visually — look for chafed insulation near the valve cover, burnt spots, spread or corroded terminals, and oil saturation.
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3
Check the injector power supply fuse and relay for the bank that includes cylinder 6; confirm battery voltage is present at the injector high-side feed with ignition on.
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4
Disconnect the cylinder 6 injector and measure solenoid coil resistance — port injectors are typically 12–16 Ω; an open reading or a near-zero reading confirms an internal injector fault.
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5
Use a noid light at the injector connector during cranking to verify the PCM is delivering a switching signal; no flash indicates a PCM driver or wiring fault upstream of the connector.
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6
Perform a cylinder swap test: move the cylinder 6 injector to another cylinder and re-scan to determine whether the P0206 fault follows the injector or stays on the circuit.
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7
If all external tests pass, use a dealer-level bidirectional scan tool to command the injector driver and verify PCM output before replacing the module.
Related powertrain codes
- P0065 — Air Assisted Injector Control Range/Performance
- P0066 — Air Assisted Injector Control Circuit or Circuit Low
- P0067 — Air Assisted Injector Control Circuit High
- P0087 — Fuel Rail/System Pressure - Too Low
- P0088 — Fuel Rail/System Pressure - Too High
- P0089 — Fuel Pressure Regulator 1 Performance
Frequently asked questions
Can a bad valve-cover gasket cause P0206?
Yes. Oil leaking from the valve cover soaks into the wiring harness and injector connector, increasing resistance or causing shorts. Inspect and replace the gasket before repairing the harness, otherwise the new repair will fail in the same way.
Is P0206 more common on V6 or V8 engines?
Cylinder 6 exists on both V6 and V8 layouts. On V6 engines, cylinder 6 is the last cylinder on Bank 2; on V8 engines it sits mid-bank. Both configurations are susceptible, but V8 trucks with long underhood harness runs tend to see more harness-chafe faults.
How do I tell if the problem is the injector or the wiring?
A noid light test distinguishes the two: plug a noid light into the disconnected injector connector and crank the engine. If the light flashes, the PCM and wiring are fine — the injector itself is the fault. If it does not flash, the fault is in the circuit or the PCM driver.
How is P0206 different from P0306?
P0206 is an electrical circuit fault logged by the PCM when it sees wrong voltage on the injector driver line. P0306 is a combustion misfire detected via crankshaft speed variation. P0206 can exist without P0306 if the driver circuit is only partially degraded.
Disabling P0206 in software
RaceTune can permanently disable P0206 — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.
Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.
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