U0423

Invalid Data Received From Instrument Panel Cluster Control Module

Communication network Generic OBD-II Medium

What it means

U0423 is a network communication code: a module is receiving data from the instrument panel cluster (IPC) that is corrupt, missing, or out of range. The cluster still communicates, but the values are wrong. Because the cluster drives your gauges and warning lamps, invalid data can leave you without accurate speed, fuel, or warning information, so it's worth fixing promptly.

Medium

Can I keep driving? Drivable, but gauges and warning lamps may read wrong or go blank — you can lose speed or fuel readouts, so treat it promptly.

Real-world scan data

Seen in

964

scans in the past year

Found in

0.1%

of scans

0.3%

of scans that found faults

Appears alongside · share of U0423 scans

U0001in 55.6% of scans

C1050in 51.8% of scans

U3003in 51.0% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Gauges reading incorrectly, sticking, or dropping to zero
Warning lights staying on, flickering, or not illuminating
Blank or glitching instrument-cluster display
Odometer, trip, or message-center data missing or frozen

Common causes

Most likely first

Internal fault in the instrument panel cluster (IPC) sending corrupt dataLikely
Wiring or connector problems on the bus behind the clusterCommon
Low system voltage or a poor ground at the clusterCommon
Software mismatch after a cluster replacement or reprogrammingLess often

How to diagnose & fix

Work through it in order

Scan all modules and record freeze-frame data; fix any lost-communication codes first.
Check battery voltage and cluster grounds.
Inspect the cluster connector and bus wiring for corrosion or loose pins.
Test the CAN bus for shorts or opens affecting the cluster.
If power and wiring are good, suspect the IPC; reflash or replace and program per manufacturer procedure.

FAQ

Quick answers

Is it safe to drive with U0423?+

You can drive, but don't rely on the gauges. If the speedometer, fuel gauge, or warning lamps read wrong, you may miss a real problem — get it fixed soon.

Can I just clear U0423?+

Clearing may briefly restore the display, but it returns while the cluster reports bad data. Check power and wiring, then the cluster itself.

Read & clear U0423 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX