Internal fault in the glow plug control module (corrupt memory); Low or unstable battery or supply voltage during module start-up or shutdown, corrupting the stored data; Poor power or earth connection to the glow plug control module (corrosion, loose terminals); Water ingress or heat damage inside the module or its connector; Interrupted or failed software update or earlier reprogramming attempt; Outdated or faulty module calibration, where the manufacturer has identified this as a known issue for the model.

P06DF

Glow Plug Control Module 1 Memory Checksum Error.

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
DF: FaultThe specific fault in that area

What it means

P06DF means the glow plug control module (bank or unit 1) ran its self-test and found that the stored data in its memory did not match the expected checksum. The module treats its own programming or calibration data as corrupt or unreliable. This is an internal module fault, not a fault in the glow plugs themselves, although supply or wiring problems can trigger it.

Symptoms

Engine management warning light on, and possibly a glow plug warning lamp
Hard or extended cranking on cold starts
White smoke or rough running for the first minutes after a cold start
Glow plugs not operating, or operating at the wrong times
Other glow plug codes stored alongside it
No noticeable symptoms when the engine is warm

Possible causes

Internal fault in the glow plug control module (corrupt memory)likely
Low or unstable battery or supply voltage during module start-up or shutdown, corrupting the stored datapossible
Poor power or earth connection to the glow plug control module (corrosion, loose terminals)possible
Water ingress or heat damage inside the module or its connectorpossible
Interrupted or failed software update or earlier reprogramming attemptrare
Outdated or faulty module calibration, where the manufacturer has identified this as a known issue for the modelrare

How to diagnose

Read all stored and pending codes and record the freeze frame data; note any voltage, communication or other glow plug codes
Check the battery state of charge and charging system output, as low voltage can corrupt module memory
Inspect the module, its connector, and the power and earth wiring for corrosion, water, heat damage or looseness
Check the relevant fuses and relays in the glow plug supply and module supply circuits
Clear the code, then cycle the ignition and retest to see if it returns immediately (a hard fault) or only intermittently
Check live data and module communication on the diagnostic network to confirm the module responds normally
Look up manufacturer service information for this model for known software updates or bulletins relating to the module
If the code returns with good supply and wiring, test the module's operation against the manufacturer's procedure before replacing it

How to fix

Repair any corroded, loose or damaged power, earth or connector faults found
Charge or replace a weak battery and correct any charging system fault
Dry out and fix the cause of any water ingress, replacing the connector or terminals if damaged
Update or reload the module software if the manufacturer specifies this for a known fault
Replace the glow plug control module and have it coded or programmed to the vehicle as the manufacturer requires

Can I keep driving?

Medium severity

The car can usually be driven short-term, but cold starting may be poor and the fault could worsen. Get it checked soon, especially before cold weather.

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