P0202: Injector Circuit Malfunction - Cylinder 2
Can you still drive? Driving is not recommended. A dead cylinder causes rough running and can damage the catalytic converter from unburned fuel.
What Does P0202 Mean?
Code P0202 indicates an electrical problem in the fuel injector circuit for cylinder 2. The ECM has detected that the injector driver circuit is not operating within expected parameters, which could mean the injector is open-circuited, shorted, or has excessive resistance. This will cause cylinder 2 to misfire or not fire at all.
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Browse OBD-II Scanners on AmazonCommon Causes
- Failed fuel injector
- Damaged wiring to cylinder 2 injector
- Corroded injector connector
- Faulty injector driver in the ECM
- Poor ground connection
Symptoms
- Check engine light on
- Engine misfire on cylinder 2
- Rough idle
- Loss of power
- Increased fuel consumption
Diagnostic Steps
- 1Read freeze frame data and check for related misfire codes
- 2Measure injector resistance with a multimeter and compare to specs
- 3Check for voltage at the injector connector with the key on
- 4Swap the cylinder 2 injector with another cylinder to see if the code follows
- 5Inspect the wiring harness for damage or shorts
- 6Test the ECM injector driver output
Recommended Parts & Tools
fuel injector
noid light test kit
automotive multimeter
Estimated Repair Cost
| Type | Estimated Cost |
|---|---|
| Total Repair Cost Range | $150 - $600 |
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Frequently Asked Questions
Can I swap injectors to test P0202?
Yes, swapping the cylinder 2 injector with another cylinder is an excellent diagnostic step. If the code moves to the new cylinder, the injector is the problem. If it stays on cylinder 2, the wiring or ECM driver is at fault.
Will P0202 cause a misfire?
Yes, if the injector circuit is not functioning, cylinder 2 will not receive fuel and will misfire, which you may also see as a P0302 code.
What is a noid light and how does it help?
A noid light plugs into the injector connector and flashes when the ECM sends a signal. If the noid light flashes but the injector does not work, the injector is bad. If it does not flash, the circuit or ECM driver is at fault.
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