What Does P06BA Mean?
The glow plug circuit for cylinder 2 is operating outside its expected performance range. The glow plug is not heating correctly — either too slowly, too quickly, or to an incorrect temperature. This affects cold starting capability and cold idle quality on diesel engines. The driver may notice extended cranking, white smoke, and rough running until the engine reaches operating temperature.
Common Causes
40%
Cylinder 2 glow plug element degraded — resistance out of specification
25%
High-resistance connection at the cylinder 2 glow plug terminal or wiring
15%
Glow plug control module delivering incorrect signal to cylinder 2
10%
Wrong specification glow plug installed in cylinder 2
10%
ECM receiving incorrect coolant temperature data affecting glow plug timing calculations
Diagnostic Steps
1
Measure the resistance of the cylinder 2 glow plug — compare to manufacturer specification (typically 0.5-2.0 ohms) and compare to all other cylinders.
2
Use a clamp-on amp meter to monitor cylinder 2 glow plug current draw during the preheat cycle — initial draw should be 15-30A, tapering as temperature increases.
3
Inspect the glow plug bus bar and connector at cylinder 2 for corrosion, heat damage, or looseness — clean and re-torque if needed.
4
Check the glow plug control module output to cylinder 2 — verify voltage and duty cycle match the other cylinders.
5
Replace the glow plug if resistance is out of specification; apply anti-seize to threads and torque to manufacturer specification (typically 15-20 Nm).
Estimated Repair Cost
$50 - $400
Parts + labor, varies by vehicle and location
The glow plug circuit for cylinder 2 is operating outside its expected performance range. The glow plug is not heating correctly — either too slowly, too quickly, or to an incorrect temperature. This affects cold starting capability and cold idle quality on diesel engines. The driver may notice exte...
The most common cause of P06BA (Cylinder 2 Glow Plug Circuit Range/Performance) is: Cylinder 2 glow plug element degraded — resistance out of specification
Typical repair costs for P06BA range from $50 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A single failing glow plug on cylinder 2 will mainly cause cold start difficulty and cold idle roughness. The vehicle is safe to drive once at operating temperature. If multiple glow plug codes are present, cold starting may become impossible in freezing conditions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P06BA to identify the root cause.
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Quick Info
Category
Powertrain
System
Diesel Cold Start / Glow Plug System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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