Short to battery voltage in the wiring to the cylinder 11 glow plug control circuit; Damaged, corroded or loose connector at the glow plug or control module; Faulty glow plug for cylinder 11 (internal short or incorrect resistance); Failed output driver inside the glow plug control module; Wiring harness chafed against hot or moving engine parts, shorting to a live feed; Software fault or outdated calibration in the control module, where a manufacturer bulletin confirms it.

P06E1

Cylinder 11 Glow Plug Control Circuit High.

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
E1: FaultThe specific fault in that area

What it means

P06E1 is the generic code for a high signal in the control circuit of the glow plug for cylinder 11. The engine control unit (or glow plug control module) monitors the voltage and current on that circuit and saw a level higher than expected for the commanded state, which points to a short to voltage or a fault in the driver. It is only seen on engines with at least 11 cylinders fitted with glow plugs, so check how the cylinders are numbered for the specific vehicle.

Symptoms

Glow plug or engine management warning light on
Hard starting or extended cranking when cold
White smoke and rough running on a cold start
Misfire or uneven idle until the engine warms up
Increased cold-start emissions or smell of unburnt fuel

Possible causes

Short to battery voltage in the wiring to the cylinder 11 glow plug control circuitlikely
Damaged, corroded or loose connector at the glow plug or control modulelikely
Faulty glow plug for cylinder 11 (internal short or incorrect resistance)possible
Failed output driver inside the glow plug control modulepossible
Wiring harness chafed against hot or moving engine parts, shorting to a live feedpossible
Software fault or outdated calibration in the control module, where a manufacturer bulletin confirms itrare

How to diagnose

Read all stored and pending codes and the freeze frame data, noting engine temperature and battery voltage when the code set.
Check for other glow plug circuit codes, as several at once point to a module, supply or earth fault rather than a single plug.
Visually inspect the wiring and connectors to the cylinder 11 glow plug and the control module for chafing, melting, corrosion and water ingress.
Check battery condition and charging voltage, as low or erratic voltage can upset the circuit monitoring.
With the circuit disconnected and the ignition off, test the wiring for a short to voltage and for continuity, following the wiring diagram for the model.
Measure the glow plug resistance and compare it with the manufacturer specification for that engine.
Command the glow plugs on with a scan tool if supported, and check the control signal and current draw for cylinder 11.
Check for applicable software updates or technical bulletins for the engine before replacing the control module.

How to fix

Repair or replace the damaged wiring section that is shorting to voltage.
Clean, repair or replace corroded or damaged connectors and terminals.
Replace the cylinder 11 glow plug if it is out of specification, using the correct type for the engine.
Replace the glow plug control module if the driver is confirmed faulty, and code or adapt it as the manufacturer requires.
Apply a manufacturer calibration update only if a bulletin confirms an outdated or faulty calibration as the cause.

Can I keep driving?

Medium severity

The car can usually be driven, but cold starting may be poor and emissions higher until it is fixed. Get it checked soon, as a wiring short can damage the module or other circuits.

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