Toggle Side Panel

Shopping Cart

No products in the basket.

Shopping Cart

No products in the basket.

Close search
Home / DTC / U0423 — Invalid data received from the instrument panel control module

U0423 — Invalid data received from the instrument panel control module

Detailed page for trouble code U0423.

35,619codes
59brands
11,925generic
23,694specific
All codes P-codes (Powertrain) B-codes (Body) C-codes (Chassis) U-codes (Network/User) Tesla Alerts
Reset
Code

U0423

LAND ROVER U — Network/User

Invalid data received from the instrument panel control module

Brand: LAND ROVER
Type: U — Network/User
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty or malfunctioning instrument panel control module (IPC)
  • Software or calibration mismatch (outdated or incorrect programming)
  • Corroded, loose or damaged connectors at the IPC or in the CAN bus harness
  • Physical damage or short/open in CAN high/low wiring
  • Voltage supply problems (low battery, poor ground, intermittent power)
  • Aftermarket electronic modules or improperly fitted accessories interfering with the CAN bus

Symptoms

  • MIL (check engine light) or network warning lamp illuminated
  • Instrument cluster behaves incorrectly (flicker, missing gauges, erroneous readings)
  • Loss or intermittent loss of functions controlled/coordinated by the IPC (lighting, cluster messages, vehicle info)
  • Other control modules report communication or data errors
  • Fault present only under certain conditions (after start, on road, after load)

What to check

  • Read all stored and pending DTCs and freeze frame data from all modules (use manufacturer-level scanner)
  • Check vehicle battery voltage and charging system — ensure stable 12V+ while testing
  • Visually inspect IPC connectors and harness for corrosion, bent pins, water ingress or damage
  • Scan CAN network for bus errors, repeated messages, or missing expected IDs
  • Compare IPC software/part number and calibration to factory data (check for recent service or replacements)
  • Inspect for aftermarket devices connected to the network (alarm, telematics, audio amplifiers)

Signal parameters

  • CAN bus recessive voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (idle)
  • CAN bus dominant voltages: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (when active)
  • Expected differential voltage when dominant ≈ 1.5–2.5 V
  • Typical message frequency and CAN IDs for IPC messages vary by model — consult manufacturer data for exact IDs and rates
  • Look for sustained bit errors, error frames, or missing expected message intervals during live-data capture

Diagnostic algorithm

  1. Retrieve and record all DTCs, freeze frame, and network status from all modules with a factory-capable scan tool.
  2. Verify battery resting and cranking voltages; charge or replace battery if voltage unstable. Reattempt test with good battery.
  3. Visually inspect IPC connectors, pins and associated harness for damage, corrosion, moisture. Repair or replace damaged connectors/wiring as required.
  4. With ignition on, monitor CAN bus health with a capable scanner and/or oscilloscope. Look for expected idle voltages and clean dominant/recessive waveforms. Note any error frames or repeated retries.
  5. Trace and repair any CAN wiring faults found (shorts to ground/ battery, opens, high resistance splices). Check termination resistors (~60 Ω total across CAN_H to CAN_L).
  6. Check for and remove aftermarket modules temporarily; verify if fault clears.
  7. Verify IPC software/part numbers against manufacturer records. If mismatched or outdated, reprogram/reflash with latest calibration and reinitialize networks per service procedure.
  8. If diagnostics isolate the IPC as the source (malformed messages on oscilloscope, persistent fault after wiring and power verified), replace the IPC and program it to vehicle. Follow relearn procedures if required.
  9. Clear codes, perform functional tests and road test to confirm repair. Re-scan to ensure code does not return.

Likely causes

  • Corroded connector or loose pin at the IPC or junction causing intermittent/corrupt messages
  • Software/calibration mismatch after replacement or update (IPC not programmed to vehicle)
  • Damaged CAN high/low wiring at a harness chafe point or connector
  • Failing IPC hardware producing malformed CAN messages

Fault status

⚠️ Status
Invalid data received from Instrument Panel Control Module (IPC) — IPC messages failed validation or were corrupted on the CAN bus.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

Similar codes

U0100 U0121 U0140 U0155 U0416 U0421
413

Browse 413 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email

Report

Harassment or bullying behavior
Contains mature or sensitive content
Contains misleading or false information
Contains abusive or derogatory content
Contains spam, fake content or potential malware

Block Member?

Please confirm you want to block this member.

You will no longer be able to:

  • See blocked member's posts
  • Mention this member in posts
  • Invite this member to groups
  • Message this member
  • Add this member as a connection

Please note: This action will also remove this member from your connections and send a report to the site admin. Please allow a few minutes for this process to complete.

Report

You have already reported this .