U0264

Code

Generic U — Network/User

Lost Communication With Camera Module - Rear

Brand: Generic

Type: U — Network/User

Views: UK: 23 EN: 303 RU: 42

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Blown fuse or missing power/ground to rear camera module
Damaged or corroded camera connector or wiring harness (open, short to ground, short to battery)
Faulty rear camera module (internal failure)
CAN/LAN network fault: open circuit, short, missing termination, or high error rate
Gateway/module software mismatch or module not awake (sleep/wake issue)
Water intrusion or physical damage to camera or cable

Symptoms

Rear camera image unavailable on display or intermittent video
Dashboard message or warning about rear camera unavailable
Other modules report communication errors related to rear camera
Possible intermittent operation of reverse-assist features (parking aid, cross-traffic alert)
Stored U0264 and possibly additional U-codes for related modules

What to check

Read all stored and pending DTCs from all modules and note freeze frame data
Verify battery voltage is stable (12.4–12.8 V with key on; >11 V during cranking)
Inspect fuses and related power/ignition circuits for the camera
Visually inspect rear camera, connector, and harness for corrosion, damage, moisture, or broken pins
Backprobe camera connector: check for key-on power and good ground
Use a scan tool to request camera module data/alive messages; verify presence/absence of expected PIDs or video stream

Signal parameters

Power supply to camera: expected battery voltage with ignition on (approx. 11–14 V)
Ground: near 0 V at camera chassis/ground pin
High-speed CAN idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (recessive). Dominant state: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (values vary slightly by manufacturer)
Differential CAN_H–CAN_L idle ≈ 0 V; dominant differential ≈ 2 V
Expected message/heartbeat rate: camera alive/heartbeat messages typically 1–10 Hz; video frame/data rates higher (manufacturer specific)
Termination resistance across CAN_H and CAN_L ≈ 60 Ω (two 120 Ω in parallel)

Diagnostic algorithm

Record active and pending codes from all modules. Note any related U-codes. Clear codes only after documenting.
Confirm battery voltage and health. Perform tests with known-good battery or charger to avoid low-voltage related communication faults.
Inspect fuses and verify power/ground at camera connector with key on and engine off. Repair any blown fuse or bad ground.
Visually inspect camera, lens, connector, and harness for physical or water damage. Repair or secure loose connections.
With a scan tool, attempt to communicate with the rear camera module. Check for module ID, serial, and streaming/data PIDs. Note if module does not respond to requests.
Backprobe and measure CAN_H and CAN_L at the camera connector and at the gateway while attempting communication. Look for expected idle and active voltages and message activity. Use a scope to see noise or errors.
Check termination resistance between CAN_H and CAN_L near the camera circuit and at the gateway (~60 Ω). If termination missing or wrong value, trace and repair.
If wiring appears suspect, perform continuity and short tests between camera pins and gateway/BCM pins. Repair damaged wiring or connectors. Use shielded/paired wire repair methods and maintain service loop where required.
If wiring and power/grounds are good but no communication, try swapping or bench-testing camera with a known-good unit if available, or temporarily route a known-good camera to verify network behavior.
Check for module software updates or calibration notices for the camera or gateway. Apply software/firmware updates per manufacturer guidance.
After repairs, clear codes and confirm normal operation: camera image present, no U0264 or related codes, and reverse-assist functions operate normally. Road-test and re-check network health.

Likely causes

Missing power or ground at the camera (blown fuse, poor ground)
Broken or corroded connector/harness at the camera (water damage common on rear cameras)
Faulty rear camera module
CAN bus wiring damaged between camera and gateway (open/short/intermittent)
Network gateway/module not routing messages or module software fault