Code
B2464
HUMMER
B — Body
Navigation CD Player - Decoding Error
Views:
UK: 9
EN: 14
RU: 7
AI status
Completed
Completed
100%
Causes
- Dirty, scratched, warped or incompatible CD/disc
- Optical pickup (laser) or servo mechanism failure in the CD drive
- Corrupted or unreadable data on the disc (burned disc or bad media)
- Intermittent or low power / bad ground to the head unit
- Damaged wiring harness or poor connector/contact to the CD mechanism
- Software/firmware bug in navigation/head unit
Symptoms
- Navigation head unit displays a CD decoding or read error
- CD will not play or skips frequently
- Audio stops or drops out when using CD-based navigation audio
- Head unit may hang, reset, or show error messages when CD inserted
- No sound from CD playback while other audio sources work normally
What to check
- Verify code with a scan tool; record any additional related DTCs
- Try multiple known-good commercial audio CDs and a known-good burned disc if applicable
- Inspect discs for scratches, dirt, or warping; clean/retry
- Check power and ground at the head unit (12V constant/ignition, ground) with a meter
- Visually inspect the audio/navigation head unit and CD-mechanism connectors for corrosion, bent pins, and secure fit
- Check for water intrusion or signs of contamination in the unit
Signal parameters
- Battery/ignition supply voltage to head unit (expected ~11–14.5 V)
- Ground continuity and resistance at head unit chassis ground
- Disc present sensor status (if available)
- CD transport/servo status / optical pickup activity (if available via dealer scan tool)
- CAN/CAN-FD or MOST bus messages between radio/navigation and audio modules (error/no comms)
- CD error counters or internal read/CRC error counts (from diagnostic tool)
Diagnostic algorithm
- Confirm the B2464 code with a scan tool and note freeze frame or related codes.
- Reproduce the symptom: insert the original disc and observe behavior; try several known-good commercial CDs.
- Inspect and clean the disc(s) and retest. If commercial discs read OK but specific disc fails, treat as bad media.
- Inspect connectors and wiring at the back of the head unit for corrosion, loose pins, or damage. Wiggle-test harness while observing operation.
- Measure supply and ground at the head unit with a multimeter. Repair any low/absent voltages or poor grounds.
- Use dealer-level scan tool (if available) to read CD drive/optical pickup status, read error counters, and check for software updates or known defects.
- If intermittent or only certain discs fail, consider cleaning or servicing the optical pickup. Some units respond to in-unit CD drive cleaning.
- If the unit shows internal mechanical or optical faults, replace or repair the CD/navigation head unit. Confirm repair by re-checking for stored codes and by testing with multiple discs.
- After repair, clear codes, perform functional test and road test if required. Verify no recurrence of B2464.
Likely causes
- Dirty, scratched or incompatible disc
- Failing optical pickup (laser) or drive mechanics
- Corrupted/badly burned disc
- Poor electrical connection (power/ground) to the head unit
Fault status
Status
Navigation CD player reported a decoding/read error — the unit could not decode the disc data.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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