U030B

Code

Generic U — Network/User

Software Incompatibility With Glow Plug Control Module 2

Brand: Generic

Type: U — Network/User

Views: UK: 19 EN: 31 RU: 27

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Incorrect or mismatched glow plug module software/firmware version
Module was not programmed with the correct vehicle calibration or VIN
Failed or interrupted module reflash (corrupted firmware)
Wrong module part number or aftermarket module incompatible with vehicle
CAN bus communication errors or wiring/connectors faults
Low or unstable battery voltage during programming

Symptoms

Malfunction Indicator Lamp (MIL) or warning lamp illuminated
Glow plug system may not operate correctly (longer warm-up, hard cold starts)
Reduced cold-start performance or extended cranking
Multiple network communication or U-codes present
Inability to complete module programming or update
Some related features may be disabled as a protective measure

What to check

Use a capable scan tool to read U030B and all other stored U/P/C codes and freeze-frame data
Check software/firmware part numbers, hardware IDs and calibration IDs in Glow Plug Control Module 2 and main controller
Confirm vehicle VIN and configuration were used during any programming
Inspect CAN bus wiring, connectors, and grounds between controllers for damage, corrosion, or loose pins
Measure battery voltage at rest and during cranking; ensure >12.6 V for reflash procedures
Look for signs of failed programming (incomplete reflashes, tool error messages)

Signal parameters

Glow Plug Control Module 2 software/firmware version (SW part number)
Glow Plug Control Module hardware ID and serial number
Calibration ID / VIN programmed into module
CAN bus error counters and bus load
Module bootloader/diagnostic state flags
Supply voltage to glow plug module (nominal battery voltage)

Diagnostic algorithm

Record all DTCs and freeze-frame data from all control modules. Note timing and any other U-codes or communication faults.
Confirm the fault appeared after module replacement, update, or battery disconnect. Ask service history questions.
Using OEM-level scan tool, read the software and hardware IDs (SW part number, HW ID, calibration ID) from Glow Plug Control Module 2 and compare to vehicle expected values.
Verify VIN and vehicle configuration are correctly programmed in the module. If incorrect, reprogram with correct VIN/calibration using OEM procedures.
Inspect CAN high/low wiring, connectors, and chassis grounds between the glow plug module and main controller. Repair any wiring faults or corrosion.
Check battery condition and supply voltage. If voltage was low during previous programming, stabilize battery (charger/maintainer or known-good battery) before reflash.
Attempt to reflash or reprogram the glow plug module with the correct OEM software and calibration. Observe tool messages and confirm successful write and verification.
If reflash fails or module reports wrong hardware ID, verify the module part number. Replace with correct OEM part if necessary.
After successful programming or replacement, clear codes, complete any required relearns, and perform a cold-start test and road test to confirm the fault does not return.
If the code persists despite correct software and wiring, capture communication logs and escalate to OEM support or follow manufacturer technical bulletins.

Likely causes

Recent module replacement or software update without correct programming
Module programmed with wrong calibration or VIN mismatch
Corrupted firmware due to interrupted reflash (battery or tool failure)
Incorrect part installed (different hardware ID)
Intermittent CAN bus communication preventing proper handshake

Fault status

⚠️ Status

Software incompatibility detected on Glow Plug Control Module 2 — module SW/HW or calibration does not match vehicle expectations (possible bad/mismatched programming, corrupted firmware, or communication issue).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours