P0207 indicates the Powertrain Control Module (PCM) has detected an open circuit or abnormal voltage reading for the Number 7 fuel injector. The PCM monitors the electrical feedback from each injector, and when it cannot complete the expected circuit or receives no signal from cylinder 7's injector, this code is set. This is an electrical fault code, not a mechanical fuel delivery problem.
The most common cause is an internal electrical failure within the injector itself, where the coil winding opens and creates an infinite resistance circuit.
Chafed, broken, melted, or corroded wires in the injector circuit between the PCM and the injector can create an open circuit.
Corroded, loose, or damaged injector connector pins can prevent proper electrical contact and cause an open circuit condition.
A poor ground connection for the injector circuit, often due to corrosion or damaged ground straps, can prevent proper circuit completion.
The PCM contains driver circuits for each injector; while rare, a specific driver failure for cylinder 7 can cause this code, though this typically affects multiple cylinders or causes a no-start condition.
A faulty PCM is an extremely rare cause of P0207 and is almost never the actual fault unless all other causes have been definitively ruled out.
Driving is not recommended for extended periods. The engine will run poorly, misfire, and consume excess fuel. Additionally, unburned fuel entering the exhaust can potentially damage the catalytic converter.
Almost never. While the PCM can fail, it is the least likely cause. Technicians frequently report customers being told to replace the PCM for this code when the actual fault is a failed injector, wiring issue, or connector problem. Always diagnose the circuit thoroughly before considering PCM replacement.
Yes. If you swap cylinder 7's injector with a known-good cylinder's injector and the code changes to the cylinder you swapped it to (e.g., P0201 for cylinder 1), the original injector is faulty. If the code stays P0207, the problem is in the wiring or connector.
No. P0207 is specifically for the fuel injector circuit. A bad spark plug would set a misfire code (P0307 for cylinder 7) or an ignition coil/plug circuit code, not an injector circuit code.