Glow Plug Monitor Fault Bank #2
The P1396 code indicates a fault in the glow plug monitoring circuit for bank #2 (the cylinder bank opposite #1). This system checks the electrical resistance of each glow plug during pre-glow and post-glow phases. A fault may be due to an open or shorted glow plug, a failed glow plug relay, or wiring issues. In diesel engines, this can cause hard starting, increased emissions, and poor cold-weather performance.
1. Symptoms You Will Notice
- Check Engine Light illuminated
- Hard starting, especially in cold weather
- Rough idle or misfire on cold start
- Excessive white smoke from exhaust on startup
2. Most Common Causes
- Failed glow plug(s) in bank #2
- Open or shorted glow plug wiring
- Faulty glow plug relay or control module
- Corrosion or poor connection at glow plug harness
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect glow plug wiring and connectors on bank #2 for damage or corrosion.
Step 3: Measure resistance of each glow plug in bank #2 (spec: 0.5-2.0 ohms).
Step 4: Test glow plug relay and control circuit operation with a multimeter or scan tool.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
You can drive short distances in mild weather, but avoid cold starts and long trips. Driving with faulty glow plugs can cause hard starting, increased emissions, and potential damage to the glow plug control module.
How much does it cost to fix?▼
Replacing a single glow plug costs $50-$150 including parts and labor. If multiple plugs or the relay need replacement, costs can range from $150-$400.
5. Commonly Affected Makes
This is a manufacturer-specific code. The exact manufacturer is not confirmed in our current database.