Fuel Injector 1 Control Circuit High (GM)
What does P1213 mean?
The P1213 code means the vehicle's onboard diagnostic system has detected: Fuel Injector 1 Control Circuit High (GM). This is a moderate severity code.
Common Symptoms
- Check Engine Light on
- Cylinder 1 misfire
- Rough idle
- Reduced engine power
- Possible fuel smell
Probable Causes (Ranked by Likelihood)
- Short circuit in cylinder 1 injector coil Very High
- Wiring short to power in injector 1 circuit High
- Corroded injector 1 connector causing high resistance Moderate
- Injector harness chafing against engine Moderate
- PCM injector driver malfunction Low
Step-by-Step Diagnostic Procedure
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Measure cylinder 1 injector resistance (should be within GM specs)
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Check for short to power in the injector control wire
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Inspect the injector connector and wiring for damage or chafing
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Swap the injector with another cylinder to verify the fault
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Test the PCM injector driver output
Frequently Asked Questions
What does high circuit mean for the injector?
A high circuit condition means the PCM detects higher-than-expected voltage on the injector control wire. This is usually caused by a short to power in the wiring or an internal short in the injector coil.
Can a shorted injector damage the PCM?
In rare cases, a severely shorted injector can draw excessive current through the PCM driver circuit, potentially damaging it. This is why prompt diagnosis and repair is recommended.
How do I test the injector circuit for shorts?
Disconnect the injector and measure resistance across the pins (should match specifications). Then check from each pin to ground and to battery positive to look for shorts. Also inspect the wiring for visible damage.