What Does P06BB Mean?
The glow plug circuit for cylinder 3 is operating outside its expected performance range. The heating element is not achieving the correct temperature profile during preheat and post-heat cycles. On diesel engines, this affects combustion quality during cold conditions. The driver may experience hard starts, excess white smoke, and cold rough idle.
Common Causes
40%
Cylinder 3 glow plug element worn or degraded with out-of-spec resistance
25%
Corroded or loose electrical connection at the cylinder 3 glow plug
15%
Glow plug control module fault affecting cylinder 3 output
10%
Incorrect replacement glow plug with wrong resistance or heat characteristics
10%
PCM calibration issue miscalculating required glow plug heating duration
Diagnostic Steps
1
Measure cylinder 3 glow plug resistance with a DVOM and compare to the other cylinders — all should be within 0.1 ohms of each other.
2
Monitor the current draw of each glow plug during a preheat cycle with a clamp-on amp meter — cylinder 3 should draw similar amperage to the others.
3
Inspect the bus bar connection at cylinder 3 — look for signs of arcing, melting, or oxidation that would create resistance in the circuit.
4
Verify the glow plug control module is providing consistent output to all cylinders by measuring voltage at each glow plug terminal during preheat.
5
If glow plug resistance is out of specification, remove and replace — inspect the bore for carbon buildup or coolant intrusion before installing the new plug.
Estimated Repair Cost
$50 - $400
Parts + labor, varies by vehicle and location
The glow plug circuit for cylinder 3 is operating outside its expected performance range. The heating element is not achieving the correct temperature profile during preheat and post-heat cycles. On diesel engines, this affects combustion quality during cold conditions. The driver may experience har...
The most common cause of P06BB (Cylinder 3 Glow Plug Circuit Range/Performance) is: Cylinder 3 glow plug element worn or degraded with out-of-spec resistance
Typical repair costs for P06BB range from $50 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A single cylinder glow plug performance issue does not pose a driving safety risk. Cold starts may be harder, and the engine may run rough for the first minute or two. Repair before winter weather to ensure reliable cold starting.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P06BB to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Diesel Cold Start / Glow Plug System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
