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Home / DTC / P06DF — Glow Plug Control Module 1 Memory Checksum Error

P06DF — Glow Plug Control Module 1 Memory Checksum Error

Detailed page for trouble code P06DF.

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11,914generic
22,491specific
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Code

P06DF

Generic P — Powertrain

Glow Plug Control Module 1 Memory Checksum Error

Brand: Generic
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Corrupted module firmware or EEPROM data
  • Failed or failing glow plug control module (internal hardware fault)
  • Voltage abnormalities (low battery, spikes, or poor charging system)
  • Intermittent or poor power/ground connections to the module
  • Water ingress, corrosion, or physical damage to the module or connector
  • Interrupted or failed module reflash/update

Symptoms

  • Malfunction Indicator Lamp (MIL) or glow plug fault lamp illuminated
  • Reduced or no glow plug operation (longer cranking, hard cold starts)
  • Increased white/blue smoke on cold start
  • Diagnostic trouble codes related to glow plugs or communications
  • Possible loss of CAN communication with the glow plug module

What to check

  • Scan vehicle with a professional diagnostic tool; record P06DF and any related codes and freeze frame data
  • Check battery voltage with ignition on and during cranking (should be ~11–14.5 V depending on load and charging)
  • Visually inspect module, connectors and wiring for damage, corrosion, or water intrusion
  • Verify fuses/relays associated with glow plug supply and module power
  • Back-probe module power and ground pins for solid connection and low resistance to battery
  • Check CAN bus (or other module network) for proper voltage levels and communication messages

Signal parameters

  • Module supply voltage: typically battery voltage range under ignition (~11–14.5 V)
  • Module ground: near 0 V with good chassis/ground connection
  • CAN High/Low idle voltages: approximately 2.5 V centre (varies by vehicle) and differential signaling present
  • Glow plug control output: PWM duty cycle or on-time command during preheat (varies with engine temp)
  • Module current draw: small standby current, higher current during glow plug activation (amps depend on engine/glow plug design)

Diagnostic algorithm

  1. Retrieve all stored codes and freeze frame, note battery voltage and conditions when P06DF set.
  2. Clear codes and re-run key-on and a cold-start cycle to see if code returns. If intermittent, monitor conditions when it returns.
  3. Verify battery state-of-charge and charging system. Charge battery to full and re-check while repeating test procedure.
  4. Inspect connectors and wiring to the glow plug control module for corrosion, bent pins, or water ingress. Repair any damage and ensure secure connections.
  5. Measure module supply and ground at the module connector with ignition ON and during glow plug activation; confirm stable voltage and good ground reference.
  6. Check CAN/network communication to the module using scan tool: confirm module responds, check for other communication-related trouble codes.
  7. If the module is accessible, perform a wiggle test on harness while monitoring live data and codes to reproduce fault caused by intermittent wiring.
  8. Check for recent software updates or failed reflashes. If an update was attempted, verify correct file and successful procedure per OEM instructions.
  9. If available, attempt to reprogram or update module firmware with OEM-approved tool following manufacturer procedure; retest after reflash.
  10. If reflash fails or module still reports checksum error after verifying power, grounds, and communications, replace the glow plug control module and reprogram/configure as required by vehicle manufacturer.
  11. After repair or replacement, clear codes and perform full functional test (cold start cycles and live-data monitoring) to confirm the fault is resolved.

Likely causes

  • Failed module firmware after unsuccessful update
  • Poor battery/charging voltage during normal operation or programming
  • Corroded connector or poor ground at module
  • Module internal hardware fault (EEPROM/processor)

Fault status

⚠️ Status
Memory checksum error in Glow Plug Control Module 1 — module internal non-volatile memory integrity check failed or reported corrupted configuration/firmware. Verify power, grounds, communications and software before module replacement.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1-3 hours

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Code

P06DF

LAND ROVER P — Powertrain

Glow Plug Control Module 1 - Sum Error memory check

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Corrupted module firmware or EEPROM data
  • Failed or failing glow plug control module (internal hardware fault)
  • Voltage abnormalities (low battery, spikes, or poor charging system)
  • Intermittent or poor power/ground connections to the module
  • Water ingress, corrosion, or physical damage to the module or connector
  • Interrupted or failed module reflash/update

Symptoms

  • Malfunction Indicator Lamp (MIL) or glow plug fault lamp illuminated
  • Reduced or no glow plug operation (longer cranking, hard cold starts)
  • Increased white/blue smoke on cold start
  • Diagnostic trouble codes related to glow plugs or communications
  • Possible loss of CAN communication with the glow plug module

What to check

  • Scan vehicle with a professional diagnostic tool; record P06DF and any related codes and freeze frame data
  • Check battery voltage with ignition on and during cranking (should be ~11–14.5 V depending on load and charging)
  • Visually inspect module, connectors and wiring for damage, corrosion, or water intrusion
  • Verify fuses/relays associated with glow plug supply and module power
  • Back-probe module power and ground pins for solid connection and low resistance to battery
  • Check CAN bus (or other module network) for proper voltage levels and communication messages

Signal parameters

  • Module supply voltage: typically battery voltage range under ignition (~11–14.5 V)
  • Module ground: near 0 V with good chassis/ground connection
  • CAN High/Low idle voltages: approximately 2.5 V centre (varies by vehicle) and differential signaling present
  • Glow plug control output: PWM duty cycle or on-time command during preheat (varies with engine temp)
  • Module current draw: small standby current, higher current during glow plug activation (amps depend on engine/glow plug design)

Diagnostic algorithm

  1. Retrieve all stored codes and freeze frame, note battery voltage and conditions when P06DF set.
  2. Clear codes and re-run key-on and a cold-start cycle to see if code returns. If intermittent, monitor conditions when it returns.
  3. Verify battery state-of-charge and charging system. Charge battery to full and re-check while repeating test procedure.
  4. Inspect connectors and wiring to the glow plug control module for corrosion, bent pins, or water ingress. Repair any damage and ensure secure connections.
  5. Measure module supply and ground at the module connector with ignition ON and during glow plug activation; confirm stable voltage and good ground reference.
  6. Check CAN/network communication to the module using scan tool: confirm module responds, check for other communication-related trouble codes.
  7. If the module is accessible, perform a wiggle test on harness while monitoring live data and codes to reproduce fault caused by intermittent wiring.
  8. Check for recent software updates or failed reflashes. If an update was attempted, verify correct file and successful procedure per OEM instructions.
  9. If available, attempt to reprogram or update module firmware with OEM-approved tool following manufacturer procedure; retest after reflash.
  10. If reflash fails or module still reports checksum error after verifying power, grounds, and communications, replace the glow plug control module and reprogram/configure as required by vehicle manufacturer.
  11. After repair or replacement, clear codes and perform full functional test (cold start cycles and live-data monitoring) to confirm the fault is resolved.

Likely causes

  • Failed module firmware after unsuccessful update
  • Poor battery/charging voltage during normal operation or programming
  • Corroded connector or poor ground at module
  • Module internal hardware fault (EEPROM/processor)

Fault status

⚠️ Status
Memory checksum error in Glow Plug Control Module 1 — module internal non-volatile memory integrity check failed or reported corrupted configuration/firmware. Verify power, grounds, communications and software before module replacement.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1-3 hours

Similar codes

P0601 P0606 P0600 P06A0 P2004
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