P0213 – Cold Start Injector 1

P0213 is a diagnostic trouble code that points to a problem with your engine’s cold start injector or cold start fuel metering circuit. When this code sets, your engine computer (ECU) has detected an electrical fault or performance issue in the circuit that helps your engine start and run correctly when it’s cold. You may notice hard starting, rough idle, or extra smoke on cold mornings. Ignoring it can lead to poor drivability and potential engine damage over time, so it’s worth diagnosing and repairing promptly.

What Does P0213 Mean?

P0213 stands for “Cold Start Injector 1 Malfunction” (or “Cold Start Fuel Injector Circuit Malfunction” on some manufacturers). The ECU monitors voltage and feedback from the cold start injector circuit. If the signal is out of range, open, shorted, or the injector isn’t responding as expected, the ECU stores P0213 and usually turns on the check engine light.

This injector (or cold start enrichment system) adds extra fuel during cold starts to stabilize idle and reduce stalling. A fault here means your engine isn’t getting the correct fuel enrichment when cold, which is why symptoms are usually worse on the first start of the day.

Quick Reference

• Code: P0213
• Definition: Cold Start Injector 1 / Cold Start Fuel Injector Circuit Malfunction
• Severity: Moderate – can lead to drivability issues, especially when cold
• Common Symptoms: Hard cold start, rough idle, misfire, black smoke
• Typical Causes: Faulty cold start injector, wiring issues, connector corrosion, ECU driver fault

Real-World Example / Field Notes

In the shop, I usually see P0213 on vehicles that struggle first thing in the morning. A typical case: a customer with a small SUV complains it “chugs and shakes” for the first minute after a cold start, then runs fine the rest of the day. Scan tool shows P0213 stored and sometimes a rich condition on the O2 sensors at cold start. A quick visual inspection reveals a cracked injector connector and green corrosion inside. After repairing the wiring pigtail and clearing the code, cold starts smooth out and fuel trims return to normal.

Symptoms of P0213

• Hard cold starting – engine cranks longer than normal or needs multiple attempts when cold.
• Rough idle on cold start – shaking, stumbling, or almost stalling for the first minute or two.
• Cold start misfires – popping, hesitation, or misfire codes that are worse when the engine is cold.
• Excess exhaust smoke – often black smoke from a rich fuel mixture during cold start.
• Poor fuel economy – extra fuel used during warm-up due to incorrect enrichment.
• Check engine light – MIL on or flashing, with P0213 stored and possibly related fuel trim codes.
• Fuel smell – strong raw fuel odor from the exhaust or around the engine bay on startup.

Common Causes of P0213

Most Common Causes

• Faulty cold start injector – internal coil failure, clogged nozzle, or stuck open/closed injector.
• Wiring damage – broken, chafed, or shorted wires between the ECU and the cold start injector.
• Corroded or loose connector – moisture intrusion causing high resistance or intermittent contact.
• Poor ground or power supply – weak voltage to the injector due to bad grounds or corroded power feed.
• Previous repairs or modifications – aftermarket remote start, alarm, or engine work disturbing the harness.

Less Common Causes

• ECU driver failure – the internal transistor that controls the injector fails, causing no control signal.
• Incorrect or incompatible injector – wrong part installed with different resistance or flow specs.
• Severe fuel contamination – debris or varnish clogging the cold start injector, changing its behavior.
• Sensor issues affecting cold strategy – faulty coolant temperature sensor or intake air temp sensor confusing the ECU, though these usually set their own codes.
• Rodent damage – chewed wiring harness near the fuel rail or intake area.

Diagnosis: Step-by-Step Guide

You’ll want a basic tool set, a quality scan tool that can read live data, a digital multimeter, and ideally a wiring diagram for your specific vehicle. A noid light or injector test light is helpful to check injector pulse. If you have access to Mode $06 data, that can give extra detail on misfire and fuel system performance during cold start.

1. Confirm the code and freeze frame data. Use your scan tool to pull P0213 and note freeze frame: coolant temperature, RPM, and load when the code set. If it set at low coolant temp and idle, that supports a cold start issue.
2. Perform a visual inspection. Locate the cold start injector (often on the intake manifold or fuel rail). Check the connector, wiring insulation, and nearby components for damage, oil saturation, or melted spots.
3. Check for related codes. Look for fuel trim, misfire, or coolant temperature sensor codes. Address obvious sensor faults first, as they can influence cold start strategy.
4. Test injector connector voltage. With the key on (engine off), use a multimeter to check for proper power and ground at the injector connector according to the wiring diagram. You should see battery voltage on the power side and a good ground or ECU-controlled side.
5. Check injector resistance. With the connector unplugged and the engine off, measure the resistance of the cold start injector across its terminals. Compare to the factory spec. A reading that’s open (infinite), shorted (near 0 ohms), or way out of spec points to a bad injector.
6. Verify injector control signal. During a cold start attempt, use a noid light or scope on the injector connector to see if the ECU is pulsing the injector. No pulse with good power and wiring may indicate an ECU driver issue.
7. Inspect wiring continuity. If power or ground is missing, do a continuity test from the injector connector back to the ECU connector. Repair any open or shorted wires, and clean or replace corroded terminals.
8. Check fuel system basics. Confirm fuel pressure is within spec and that other injectors are operating correctly. A global fuel problem can mask or compound a cold start injector fault.
9. Clear codes and perform a cold start test. After any repair or adjustment, clear P0213 and let the engine fully cool down. Then perform a true cold start and monitor live data, fuel trims, and whether the code returns.

Pro tip: Many vehicles only activate the cold start injector below a certain coolant temperature. If you test on a warm engine, you might think the injector is dead when it’s simply not being commanded. Always verify coolant temp and test on a genuinely cold engine when dealing with P0213.

Possible Fixes & Repair Costs

Fixing P0213 usually involves restoring proper operation of the cold start injector circuit. Common repairs include replacing the cold start injector, repairing or replacing damaged wiring or connectors, cleaning corroded terminals, and in rare cases replacing the ECU. Typical repair costs range from about $150–$350 for a simple wiring or connector repair, $250–$600 for a new cold start injector with labor, and $600–$1,200+ if an ECU replacement and programming are required. Costs vary by vehicle make, parts availability, labor rates, and how difficult the injector is to access.

• Replace cold start injector – new or OEM-equivalent injector installed, seals replaced as needed.
• Repair wiring harness – fix broken wires, add new pigtail, secure harness away from heat and vibration.
• Clean or replace connector – remove corrosion, apply dielectric grease, or install a new connector housing.
• Update or replace ECU – only after confirming the driver circuit is faulty and wiring/injector are good.
• Address related sensor issues – coolant temp or intake air temp sensors if they’re skewing cold start strategy.

Can I Still Drive With P0213?

You can usually drive with P0213 for a short period, but it’s not ideal. The main problems show up on cold starts: hard starting, rough idle, and possible stalling. Once the engine warms up, it may run almost normal, but you could still see poor fuel economy and extra emissions. If the injector is stuck open, you risk washing down cylinder walls with fuel, contaminating the oil, and damaging the catalytic converter. It’s best to minimize driving until you diagnose and repair the issue.

What Happens If You Ignore P0213?

Ignoring P0213 can turn a relatively simple electrical or injector repair into bigger problems. Long-term rich cold starts can foul spark plugs, damage the catalytic converter, dilute engine oil with fuel, and increase carbon buildup inside the engine. You’ll also live with poor cold drivability and higher fuel consumption, and you may fail emissions testing in areas that require it.

Last updated: February 13, 2026

Vehicles Commonly Affected by P0213

P0213 shows up most often on vehicles that use a dedicated cold start injector or enrichment system. You’ll see it on some older and early-2000s models from manufacturers like Toyota, Lexus, Nissan, Infiniti, BMW, Mercedes-Benz, and certain GM and Ford engines that were designed with an auxiliary cold start injector. It’s more common on multi-port fuel injection systems and inline or V6/V8 engines where the cold start injector is mounted on the intake manifold or fuel rail. Modern direct-injection engines are less likely to use a separate cold start injector, so they see this code less frequently.