What Does P0202 Mean?
This code indicates a malfunction in the fuel injector circuit for cylinder 2. The ECM has detected an electrical fault such as an open, short to ground, or short to battery in the cylinder 2 injector driver circuit. This prevents proper fuel delivery to cylinder 2, causing a misfire and rough idle.
Common Causes
35%
Faulty cylinder 2 fuel injector with an open or shorted internal solenoid coil winding
30%
Damaged, corroded, or broken wiring at the cylinder 2 injector connector or harness
20%
Failed ECM injector driver transistor for the cylinder 2 circuit
15%
Injector power supply fault from the relay or fused feed affecting cylinder 2
Diagnostic Steps
1
Step 1: Measure cylinder 2 injector resistance (disconnect connector, test across terminals). Compare to specification: high-impedance 11-17 ohms, low-impedance 2-5 ohms. Replace if out of range.
2
Step 2: Verify 12V power is present at the injector connector with the key on. If missing, check the injector power relay and associated fuse.
3
Step 3: Use a noid light at the cylinder 2 injector connector to confirm ECM pulse signal during cranking. No pulse indicates ECM driver or wiring fault.
4
Step 4: Swap the cylinder 2 injector with an adjacent cylinder. If the code follows the injector, replace it. If the code stays on cylinder 2, the fault is in the wiring or ECM.
5
Step 5: Inspect the injector harness for damage, particularly where it routes near the intake manifold or valve cover. Repair any chafed or broken wires.
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
This code indicates a malfunction in the fuel injector circuit for cylinder 2. The ECM has detected an electrical fault such as an open, short to ground, or short to battery in the cylinder 2 injector driver circuit. This prevents proper fuel delivery to cylinder 2, causing a misfire and rough idle.
The most common cause of P0202 (Injector Circuit Malfunction - Cylinder 2) is: Faulty cylinder 2 fuel injector with an open or shorted internal solenoid coil winding
Typical repair costs for P0202 range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A non-functioning cylinder 2 injector causes a persistent misfire that dumps raw fuel into the catalytic converter, risking converter meltdown and fire. Engine power is noticeably reduced.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0202 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel Injection System
Difficulty
Type
Generic (SAE)
Recommended Tools
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