P1213 Cylinder 6 Injector Circuit Fault
The P1213 code indicates that the Engine Control Module (ECM) has detected an open or short circuit in the fuel injector control circuit for cylinder #6. The ECM monitors voltage and current in the injector driver circuit; if the voltage does not change as expected when the injector is turned on/off (open circuit) or if current exceeds a safe limit (short to ground or coil short), this diagnostic trouble code (DTC) is stored.
01. Most Common Causes
- Faulty fuel injector on cylinder #6 (internal coil open or shorted)
- Damaged, corroded, or loose wiring or connectors in the #6 injector circuit
- Short to ground or voltage in the #6 injector harness
- Internal failure of the injector driver within the ECM/PCM
- Blown injector circuit fuse (if common circuit)
02. Symptoms You Will Notice
- Engine misfire on cylinder #6
- Rough idle or hesitation during acceleration
- Check Engine Light illuminated
- Possible hard starting or no-start condition
- Reduced fuel economy and performance
03. Step-by-Step Diagnosis
Scan for codes and verify P1213 is present; check for related misfire codes.
Inspect wiring and connectors at injector #6 for damage, corrosion, or loose connections.
Test injector #6 resistance with a multimeter; compare to specifications (typically 11-17 ohms).
Check for power and ground at the injector connector with key on; verify injector pulse with a noid light or oscilloscope.
If wiring and injector test OK, suspect a faulty ECM driver; perform a continuity test from injector connector to ECM pin.
1. Frequently Asked Questions
Is it safe to drive?▼
No, it is not safe to drive with this code. The injector circuit fault can cause severe engine misfire, potential catalytic converter damage, and may leave you stranded. Have the vehicle diagnosed and repaired immediately.
How much does it cost to fix?▼
Repair costs typically range from $150 to $600 USD, depending on the cause. A single injector replacement costs $100-$300 plus labor ($100-$200). Wiring repairs are usually $100-$250. ECM replacement is more expensive, often $500-$1000.