Glow Plug Monitor Fault Bank #1
The P1395 code indicates that the powertrain control module (PCM) has detected a malfunction in the glow plug monitoring circuit for cylinder bank #1. This typically occurs when one or more glow plugs fail to reach the required resistance or current draw, or when the glow plug control module or wiring is faulty. In diesel engines, glow plugs are essential for cold starts, and a fault can lead to hard starting, excessive smoke, and increased emissions.
1. Symptoms You Will Notice
- Hard starting, especially in cold weather
- Excessive white smoke on startup
- Check Engine Light illuminated
- Rough idle or misfire during warm-up
2. Most Common Causes
- Faulty or incorrectly installed octane adjustment module
- Open or short circuit in the octane adjust pin wiring
- Corroded, damaged, or bent pins in the PCM connector
- Internal PCM failure in the octane pin detection circuit
- Abnormal resistance in the circuit due to splices or deteriorated wires
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to read the code and check for additional codes.
Step 2: Visually inspect glow plugs and wiring for damage or corrosion.
Step 3: Measure resistance of each glow plug; typical spec is 0.5-2.0 ohms.
Step 4: Test glow plug control module and relay for proper operation.
Step 5: Check voltage supply and ground circuits at the glow plug harness.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
You can drive short distances, but starting will be difficult in cold weather and emissions will increase. It's best to repair promptly to avoid further issues.
How much does it cost to fix?▼
Replacing glow plugs costs $50-$150 for parts and labor, depending on vehicle and accessibility. Control module replacement may be more.
5. Commonly Affected Makes
This is a manufacturer-specific code. The exact manufacturer is not confirmed in our current database.