Cylinder 1 Fuel Injector Leak
The P029D code indicates that the Engine Control Module (ECM) has detected a fuel injector leak in cylinder 1. This typically means the injector is stuck open or leaking internally, causing excess fuel to enter the cylinder. This can lead to misfires, rough idle, poor fuel economy, and potential engine damage if not addressed.
01. Most Common Causes
- Faulty fuel injector (stuck open or leaking)
- Damaged injector O-ring or seal
- Cracked injector body
- Contaminated fuel causing injector sticking
02. Symptoms You Will Notice
- Rough idle or misfire
- Strong fuel smell from exhaust
- Decreased fuel economy
- Check Engine Light on
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Perform a fuel pressure test to check for leak-down.
Step 3: Use a noid light or injector test to verify injector operation.
Step 4: Remove and inspect injector for physical damage or debris.
Step 5: Replace injector if leaking is confirmed.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, driving with a leaking injector can cause engine misfires, catalytic converter damage, and potential hydrolock. It's best to have it repaired immediately.
How much does it cost to fix?▼
Replacing a single fuel injector typically costs $200-$600 including parts and labor, depending on vehicle make and model.