Failing or degraded cylinder 10 glow plug with resistance out of range; Corroded, loose or damaged connector or terminal at the cylinder 10 glow plug; Damaged or chafed wiring between the glow plug control module and the glow plug (high resistance or partial short); Poor earth or power supply connection to the glow plug control module or low battery voltage; Faulty glow plug control module output stage for cylinder 10; Outdated control unit software where the manufacturer has issued a known fix for false glow plug circuit faults.

P06C2

Cylinder 10 Glow Plug Circuit Range/Performance.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
6: AreaComputer and output circuits
C2: FaultThe specific fault in that area

What it means

P06C2 is the generic code for a range or performance fault in the cylinder 10 glow plug circuit. The control unit monitors the glow plug circuit for current, voltage or resistance and has seen a value outside the expected window, though not a full open or short circuit. Cylinder 10 means a large engine, typically a V10 or V12 diesel, and the numbering and layout depend on the model.

Symptoms

Malfunction indicator or glow plug warning light on
Harder starting when cold, especially in low temperatures
Rough running or white smoke for a short time after a cold start
Slightly higher emissions or fuel use until the engine warms up
Possible reduced warm-up performance or limp mode on some models

Possible causes

Failing or degraded cylinder 10 glow plug with resistance out of rangelikely
Corroded, loose or damaged connector or terminal at the cylinder 10 glow pluglikely
Damaged or chafed wiring between the glow plug control module and the glow plug (high resistance or partial short)possible
Poor earth or power supply connection to the glow plug control module or low battery voltagepossible
Faulty glow plug control module output stage for cylinder 10possible
Outdated control unit software where the manufacturer has issued a known fix for false glow plug circuit faultsrare

How to diagnose

Read all stored codes and freeze frame data, noting engine temperature, battery voltage and whether other glow plug codes are present.
Check battery condition and charging voltage, as low voltage can cause range faults.
Visually inspect the cylinder 10 glow plug connector and wiring for corrosion, heat damage, chafing and loose terminals; confirm cylinder numbering for the specific engine.
Measure the cylinder 10 glow plug resistance and compare it with the manufacturer's specification and with the other glow plugs.
Check the glow plug current draw during a heat cycle if the equipment allows, comparing it with the other cylinders.
Test the supply, earth and signal wiring between the glow plug control module and the plug for voltage drop and continuity.
Check the control module power and earth connections, then use live data to see whether the module reports the fault.
Check for applicable service bulletins or software updates for the model and engine.

How to fix

Replace the cylinder 10 glow plug with one of the correct specification, tightening to the specified torque and taking care not to snap it in the head.
Clean or replace the corroded or damaged connector and terminals.
Repair or replace the damaged wiring between the control module and the glow plug.
Restore a poor power or earth connection and correct any battery or charging problem.
Replace the glow plug control module if its output is faulty after wiring and plug checks.
Update the control unit software only if the manufacturer lists it as a fix for this fault.

Can I keep driving?

Medium severity

The car can usually be driven short term, but cold starting may become difficult and the fault may get worse, so have it repaired soon. Avoid repeated cold starts in freezing weather until it is fixed.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.