What Does P1207 Mean?
P1207 indicates that the fuel injector circuit for cylinder 7 has an open circuit or a short to ground. This code applies to V8 or larger engines and means the ECM cannot properly energize the #7 injector. The engine will run on seven cylinders, producing noticeable vibration, power loss, and increased fuel consumption from compensating enrichment on other cylinders.
Common Causes
30%
Cylinder 7 fuel injector with internal open winding or ground short
25%
Damaged wiring harness between ECM and cylinder 7 injector
20%
Corroded or disconnected injector connector at cylinder 7
15%
ECM injector driver failure for the cylinder 7 output channel
10%
Harness pinched or chafed against engine block or accessories
Diagnostic Steps
1
Review freeze frame data and check for cylinder 7 misfire code (P0307) to confirm the correlation between the injector fault and misfire.
2
Measure the cylinder 7 injector resistance with a multimeter and compare against specifications (typically 11-18 ohms for high-impedance types).
3
Inspect the cylinder 7 injector connector for corrosion, loose pins, and moisture. Cylinder 7 on V8 engines is often in a less accessible location prone to heat damage.
4
Perform wiring tests from the ECM injector driver pin to the injector connector, checking for open circuits and shorts to ground.
5
Verify the ECM driver output is present using a noid light or oscilloscope waveform analysis at the cylinder 7 connector.
6
If the injector and wiring test normal, consider ECM driver failure and test by temporarily swapping the injector connector with an adjacent cylinder.
Estimated Repair Cost
$175 - $700
Parts + labor, varies by vehicle and location
P1207 indicates that the fuel injector circuit for cylinder 7 has an open circuit or a short to ground. This code applies to V8 or larger engines and means the ECM cannot properly energize the #7 injector. The engine will run on seven cylinders, producing noticeable vibration, power loss, and increa...
The most common cause of P1207 (Injector 7 Open Circuit or Ground Short Fault) is: Cylinder 7 fuel injector with internal open winding or ground short
Typical repair costs for P1207 range from $175 to $700, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Operating a V8 engine on seven cylinders causes significant vibration and reduced power. Unburned fuel from the dead cylinder can destroy the catalytic converter and poses a fire risk from overheated exhaust components.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1207 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel Injection System
Difficulty
Type
Manufacturer
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