Chafed, corroded, or broken wiring in the cylinder identification circuit between the injector harness and the powertrain control module; Failed crankshaft position sensor or camshaft position sensor that supplies the cylinder identification reference signal; Loose or contaminated electrical connector at the fuel injector or sensor feeding the circuit; Internal fault in the powertrain control module driver circuit for the injector control line; Aftermarket alarm or remote start wiring spliced into the injector harness causing a voltage drop; Engine oil or coolant intrusion into the harness connector causing a short to ground

DTC codes / Ford codes / P1219

P1219 · FordCID Low

Q: What does code P1219 mean?

CID Low. P1219 on Ford vehicles means the powertrain control module has detected a low signal from the fuel injector control circuit, specifically the circuit that carries the cylinder identification signal used to sequence injection events. The computer compares the expected voltage on that circuit to what it actually sees and flags the code when the signal stays below the acceptable threshold for a calibrated period.

P1219 on Ford vehicles means the powertrain control module has detected a low signal from the fuel injector control circuit, specifically the circuit that carries the cylinder identification signal used to sequence injection events. The computer compares the expected voltage on that circuit to what it actually sees and flags the code when the signal stays below the acceptable threshold for a calibrated period.

SystemPowertrain

Code typeFord 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 slight shake at stoplights
Hesitation or stumble during light acceleration from a stop
Reduced fuel economy as the computer defaults to a less efficient injection strategy
Intermittent stalling or hard starting in more severe cases
A faint electrical burning smell or visible chafed wiring near the injector harness

Common causes, most likely first

Chafed, corroded, or broken wiring in the cylinder identification circuit between the injector harness and the powertrain control module
Failed crankshaft position sensor or camshaft position sensor that supplies the cylinder identification reference signal
Loose or contaminated electrical connector at the fuel injector or sensor feeding the circuit
Internal fault in the powertrain control module driver circuit for the injector control line
Aftermarket alarm or remote start wiring spliced into the injector harness causing a voltage drop
Engine oil or coolant intrusion into the harness connector causing a short to ground

How to diagnose and fix it

Inspect the injector harness and cylinder identification sensor connectors for corrosion, loose pins, or chafed insulation before replacing any parts
Measure resistance and voltage drop on the cylinder identification circuit from the sensor to the powertrain control module and compare to Ford service specifications
Check the crankshaft and camshaft position sensor signals with a lab scope to confirm the reference pulse is present and clean
Verify the fuel injector itself is not shorted internally by measuring its coil resistance and comparing to the other injectors
Perform a wiggle test on the harness while watching live data for the cylinder identification signal to catch intermittent faults
Repair or replace the damaged section of harness, then clear the code and complete a drive cycle to confirm the repair
If all external circuits test good, substitute a known-good powertrain control module only after ruling out every wiring and sensor fault

What Ford techs check before replacing injectors

A low cylinder identification signal is frequently caused by a failing crankshaft position sensor rather than the injector itself, so testing the sensor output on a scope saves unnecessary injector replacement.
Ford injector harnesses routed near the exhaust manifold often develop internal wire breaks that only show up when the engine is hot, so a cold resistance check can pass while the fault is still present.
Aftermarket remote start or alarm installations that tap into the injector control wiring are a common source of this code on older Ford trucks and SUVs.
The code can set intermittently from a single loose connector pin and may not return for weeks, so a thorough wiggle test and pin drag test are more reliable than a simple code clear.
A weak battery or charging system that drops voltage during cranking can cause the powertrain control module to misread the cylinder identification signal and set P1219 without any actual circuit fault.

Can I keep driving with P1219?

You can usually drive short distances to a repair shop, but avoid heavy acceleration, towing, or long highway trips until the fault is diagnosed because a failing cylinder identification signal can cause misfires that damage the catalytic converter. If the engine is running rough or stalling, park the vehicle and arrange a tow rather than risk a breakdown in traffic.

Tools that help

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