Faulty fuel injector with an internally shorted or open coil; Damaged or chafed injector harness wiring, especially near hot or moving components; Corroded or loose injector connector pins; Failed injector driver inside the PCM; Blown fuse or damaged fusible link in the injector power feed circuit; Aftermarket alarm or remote start wiring that has tapped into the injector circuit

DTC codes / Chrysler codes / P1200

P1200 · ChryslerInjector Control Circuit

Q: What does code P1200 mean?

Injector Control Circuit. P1200 on a Chrysler vehicle indicates that the powertrain control module (PCM) has detected an abnormal condition in the injector control circuit, which is the wiring and driver stage that fires the fuel injectors. The PCM monitors the circuit for opens, shorts, or excessive current draw and sets this code when the expected electrical response is missing or out of range.

P1200 on a Chrysler vehicle indicates that the powertrain control module (PCM) has detected an abnormal condition in the injector control circuit, which is the wiring and driver stage that fires the fuel injectors. The PCM monitors the circuit for opens, shorts, or excessive current draw and sets this code when the expected electrical response is missing or out of range.

SystemPowertrain

Code typeChrysler specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering (injector circuits)

Symptoms you may notice

Illuminated check engine light, often with no other noticeable symptoms
Rough idle or misfire that may feel like a shaking engine
Reduced engine power or hesitation during acceleration
Poor fuel economy or a strong fuel smell from the exhaust
Hard starting or an engine that stalls shortly after starting

Common causes, most likely first

Faulty fuel injector with an internally shorted or open coil
Damaged or chafed injector harness wiring, especially near hot or moving components
Corroded or loose injector connector pins
Failed injector driver inside the PCM
Blown fuse or damaged fusible link in the injector power feed circuit
Aftermarket alarm or remote start wiring that has tapped into the injector circuit

How to diagnose and fix it

Inspect the injector harness and connectors for chafing, corrosion, or loose pins, and repair as needed
Check the injector circuit fuse and verify battery voltage at each injector connector with the key on
Measure injector coil resistance with a multimeter and compare to the manufacturer's specification
Perform a injector balance test or use a noid light to confirm the PCM is pulsing each injector
Check for continuity and short-to-ground on the control wire between the PCM and the suspect injector
If the circuit and injectors test good, diagnose the PCM driver or replace the PCM after confirming power and ground integrity

Chrysler Injector Circuit Quirks

Chrysler PCMs often set P1200 when a single injector driver fails, but the code can also appear if the injector harness rubs through on the intake manifold bracket, a spot that is easy to overlook.
A failed injector can test fine for resistance when cold but break down when hot, so always test the circuit both cold and after a test drive to catch intermittent faults.
The code does not always mean the injector itself is bad; a shorted injector can damage the PCM driver, so replacing only the injector without checking the driver may lead to a repeat failure.
Aftermarket remote start or alarm systems that splice into injector wiring are a common hidden cause on older Chrysler vehicles, so inspect for non-factory wiring before condemning the PCM.

Can I keep driving with P1200?

You can drive a short distance to a repair shop if the engine runs smoothly, but avoid heavy acceleration or long trips because a misfiring injector can overheat the catalytic converter. If the engine is misfiring badly or stalls, stop driving and have the vehicle towed.

Tools that help

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Guidance is general and written for Chrysler vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.