Code
U2117
OPEL
U — Network/User
CAN-Bus no Communication with Info-Display
AI status
Completed
Completed
100%
Causes
- Faulty or unpowered info-display module (instrument cluster / information display)
- Open, short or intermittent wiring on CAN High / CAN Low or power/ground circuits
- Poor connector contact or corrosion at display or junction connectors
- Missing or failed CAN termination (open/shorted 120 Ω resistors)
- Battery/vehicle voltage too low or missing power/fuse to display
- Module programming/coding or software mismatch after replacement
Symptoms
- Info-display is blank, frozen, or shows communication error
- Related instrument-cluster functions or messages not available
- Multiple CAN-related DTCs or network warnings present
- Some vehicle functions controlled through the display not working
- Intermittent appearance/disappearance of the display
What to check
- Read all U-codes from gateway, BCM, instrument cluster and infotainment with a professional scan tool
- Check battery voltage (key on/off) and condition; verify proper charging voltage
- Verify fuses and relays supplying the display and related modules
- Inspect connectors at display, BCM/gateway and intermediate junctions for corrosion, bent pins or loose locking tabs
- Check CAN termination resistor between CANH and CANL (~60 Ω total) with power off
- Measure CANH/CANL voltages at the display connector with ignition ON (recessive ~2.5 V)
Signal parameters
- CAN idle (recessive) voltages: CANH ≈ 2.5 V, CANL ≈ 2.5 V (at ignition ON)
- CAN dominant state: CANH ≈ 3.5 V, CANL ≈ 1.5 V (differential ≈ 2.0 V)
- Termination resistance: ~60 Ω measured across CANH–CANL (two 120 Ω terminators in parallel)
- Common bus bit rates: typically 250 kbps or 500 kbps depending on model (verify exact network speed)
- Supply voltage to display: battery voltage present at module power pin with ignition ON
Diagnostic algorithm
- Connect a full-function OEM-level scan tool. Record U2117 and any additional U-codes from all modules.
- Verify battery voltage and relevant fuses/relays. Replace blown fuses and retest.
- Verify that the info-display module is present on the network using the scan tool (module ID/serial may show).
- Check power and ground at the info-display connector. Repair/open circuits before further network testing.
- Visually inspect wiring and connectors from the display to the gateway/BCM. Repair damaged connectors or wiring.
- With ignition ON, measure CANH and CANL idle voltages at the display connector. If out of range, isolate wiring or module.
- Measure termination resistance with power off. If termination missing or shorted, trace and repair resistors or harness.
- Use an oscilloscope or CAN bus analyzer to inspect signal waveforms, look for noise, missing frames, or bus-off conditions. Identify the node causing errors by disconnecting suspected modules one at a time if safe.
- If wiring and power are good but the display does not respond, consider reflashing or reprogramming the display/module per manufacturer procedure and code to vehicle.
- Replace the info-display module only after verifying wiring, power, and network are good. After repairs, clear DTCs and confirm communication is restored during a road test or live-data check.
Likely causes
- Blown fuse or lost power/ground to the info-display
- Damaged or chafed CAN wiring harness at common stress points
- Loose or corroded connector pins at the display or gateway
- Failed display module (internal electronics)
- CAN bus short to battery or ground causing module to be offline
Fault status
Status
U2117 — No communication with info-display on CAN bus. Check power, ground, connectors, CAN wiring and termination; inspect module presence and software/coding.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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