P1396
FordGlow Plug Monitor Fault (Bank #2)
The engine computer has detected a fault in the glow plug monitoring system for Bank 2. Glow plugs help a diesel engine start and run smoothly when cold. This code identifies a monitored system condition; it does not prove that a particular glow plug needs replacement. Exact system layout and diagnostic steps depend on the vehicle’s model, year, and engine.
⚠️ Before You Begin (Safety First)
A glow plug fault can make cold starting difficult or cause rough running after startup. Avoid prolonged repeated cranking. If the engine runs severely rough, stalls, or produces heavy smoke, stop driving and arrange a diagnosis. Take care around hot engine parts.
Common Symptoms
- The engine may crank longer before starting, especially when cold, if the glow plug system is not assisting as intended.
- The engine may run unevenly shortly after a cold start.
- Some vehicles may show a warning light or store related glow plug codes.
- There may be no noticeable symptoms, particularly in mild weather or once the engine is warm.
Common Causes
- A glow plug on Bank 2 may not be operating as intended.
- Damaged, loose, corroded, or poorly connected wiring or connectors in the Bank 2 glow plug system may interrupt operation or monitoring.
- A fuse, relay, control module, or monitoring circuit may have a fault, depending on the vehicle’s system design.
- An engine-specific wiring or control issue may cause the monitor to report a fault without a failed glow plug.
Diagnostic Steps
- Confirm the vehicle’s model, year, and engine, and consult its service information to identify Bank 2 and the applicable glow plug system.
- Check for other stored codes and note whether the starting or running problem occurs mainly when the engine is cold.
- With the engine off and cool, visually inspect accessible Bank 2 glow plug wiring and connectors for damage, looseness, corrosion, or signs of overheating.
- Do not replace glow plugs based on this code alone; have the system tested against the vehicle-specific service information if the fault remains.
When to Call a Professional
Check for related codes and review available scan data before replacing parts. Inspect the Bank 2 glow plug wiring and connectors, then test the system using the wiring diagram and service information for the exact engine. A system-level monitor fault can involve wiring or control/monitor components as well as a glow plug.
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Commonly Asked Questions
Does P1396 prove that a Bank 2 glow plug has failed?
No. It identifies a glow plug monitor fault for Bank 2, but wiring, connections, or control and monitoring components may also be involved.
Can I keep driving with this code?
The main concern is often difficult cold starting or rough running after startup. If the engine runs severely rough, stalls, or produces heavy smoke, stop driving and arrange a diagnosis.
Why might there be no obvious symptoms?
Glow plugs matter most during cold starting and initial running. In mild conditions or with a warm engine, the fault may not be noticeable.
Should I replace all the glow plugs?
Not based on this code alone. First identify the cause with checks appropriate to the exact engine, including inspection and testing of the Bank 2 system.
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