Injector Circuit Malfunction - Cylinder 2
The P0202 code means the vehicle's onboard diagnostic system has detected: Injector Circuit Malfunction - Cylinder 2. This is a serious severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- medium
- Estimated cost
- $25-$400
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Common Symptoms
- Check Engine Light on
- Cylinder 2 misfire
- Rough idle
- Loss of power
- Fuel odor
Probable Causes (Ranked by Likelihood)
- Open or short in cylinder 2 injector wiring Very High
- Failed cylinder 2 injector High
- Corroded injector connector High
- PCM driver failure for cylinder 2 Moderate
Step-by-Step Diagnostic Procedure
-
Use NOID light on cylinder 2 injector connector while cranking.
-
Measure cylinder 2 injector resistance.
-
Check wiring continuity from injector harness to PCM.
-
Perform injector balance test if scan tool supports it.
Common Fixes by Vehicle
What techs usually find when diagnosing P0202 on specific vehicles — tap your vehicle for the fix and the exact part:
2009-2020 Ford F-150/Explorer 3.5L/5.0L Moderate DIY
Cylinder 2 injector circuit malfunction. Test injector resistance at the connector (should be 11-15 ohms). If resistance is normal, check the wiring harness between the PCM and injector for an open circuit. On the 5.0L Coyote, the injector wiring harness runs under the intake manifold and can chafe. Swap the injector with another cylinder to isolate.
Labor: 1-2 hours2010-2020 Chevrolet Silverado/GMC Sierra 5.3L Moderate DIY
Cylinder 2 injector circuit fault. Measure injector coil resistance (11-13 ohms expected). If injector tests good, check the wiring from the ECU. On the 5.3L, the injector harness connectors can work loose from engine vibration. Ensure the connector is fully seated and locked. Replace with ACDelco 217-3449 if the injector coil is open.
Labor: 1-1.5 hours2007-2017 Toyota Camry/RAV4 2.5L Moderate DIY
Injector 2 circuit open or shorted. Check the injector connector for corrosion or loose pins. Measure resistance (11-16 ohms). If the injector is good, trace the wiring to the ECU. On the 2AR-FE, the injector connectors can get oil-soaked from valve cover gasket leaks which causes corrosion. Clean and replace the connector if damaged.
Labor: 1-1.5 hoursFrequently Asked Questions
Can a leaking injector on cylinder 2 cause P0202?
Not directly. P0202 is a circuit fault (wiring or driver issue). A leaking injector would cause a rich condition and possibly P0172 or a misfire code. A failed/open injector can cause both P0202 and P0302.
Sources
This page is built from documented references. Verify against your own service info before repair work.
P0202 on Diesel, EV & Equipment
The same code ID appears across other engines and platforms. The diagnostic flow varies by manufacturer — these are the platform-specific breakdowns:
See All Codes & Fixes for Your Vehicle
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