P0204: Injector Circuit Malfunction - Cylinder 4
Can you still drive? Not recommended. Continuous driving with a dead injector can overheat and destroy the catalytic converter.
What Does P0204 Mean?
Code P0204 indicates that the ECM has detected a problem with the fuel injector circuit on cylinder 4. The electrical signal to the injector is outside the expected range, meaning the injector may not be opening or closing properly. This directly affects combustion in cylinder 4 and overall engine performance.
Need to read your codes?
An OBD-II scanner lets you read and clear diagnostic trouble codes from your vehicle's computer. Most scanners work with any car made after 1996.
Browse OBD-II Scanners on AmazonCommon Causes
- Defective fuel injector
- Damaged wiring harness to cylinder 4 injector
- Corroded connector at the injector
- ECM injector driver failure
Symptoms
- Check engine light on
- Cylinder 4 misfire
- Rough running engine
- Loss of power and acceleration
- Increased exhaust emissions
Diagnostic Steps
- 1Read freeze frame data and look for companion P0304 misfire code
- 2Test injector resistance with a multimeter
- 3Verify ECM signal with a noid light at the injector connector
- 4Swap cylinder 4 injector with another cylinder to confirm diagnosis
- 5Check the wiring harness for damage between the ECM and injector
Recommended Parts & Tools
fuel injector
noid light test kit
wiring repair kit
Estimated Repair Cost
| Type | Estimated Cost |
|---|---|
| Total Repair Cost Range | $150 - $600 |
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Frequently Asked Questions
Can a clogged injector cause P0204?
A clogged injector alone usually does not trigger P0204, which is an electrical circuit code. A clogged injector is more likely to cause a lean misfire code. P0204 specifically means the injector circuit has an electrical fault.
What if the code comes back after replacing the injector?
If the code returns after injector replacement, the problem is likely in the wiring harness or the ECM injector driver circuit. Further electrical testing is needed.
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