U0197

Code

LAND ROVER U — Network/User

Lost communication with the phone control module

Brand: LAND ROVER

Type: U — Network/User

Views: UK: 13 EN: 18 RU: 25

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Phone control module failure
Power or ground missing at the phone control module
Open/short in CAN or LIN communication wiring
Faulty connector or corrosion at module or gateway
Network termination or bus wiring fault
Software/firmware mismatch or module not programmed

Symptoms

No phone or Bluetooth functionality from infotainment
Phone menu missing or greyed out on head unit
Hands-free calls not working or audio not routed
Driver information/warning message about phone module or communication
Related modules reporting additional U0xxx communication codes
Intermittent loss of phone features or radio audio dropouts

What to check

Confirm U0197 present and record freeze frame and occurrence count with dealer-level scanner
Check for additional U0xxx codes in other modules (gateway, head unit, BCM)
Inspect fuses and relays for the phone/infotainment circuit
Visually inspect module connectors and wiring for corrosion, damage, or water ingress
Verify battery voltage and chassis ground at module connector with key on
Measure CAN high/low idle voltages and check bus termination resistance

Signal parameters

Module supply voltage: ~11–14 V with ignition ON
Ground continuity: near 0 Ω to chassis (voltage drop under load < 0.5 V)
CAN bus idle voltage: ~2.5 V on CAN High and CAN Low (differential ≈ 0 V)
CAN bus differential when active: typical square wave ±1 V around 2.5 V
Bus termination resistance (both ends present): ≈ 60 Ω across CAN high and low
LIN line idle: near battery voltage (dependent on network); low pulses when active

Diagnostic algorithm

Use a compatible diagnostic tool to confirm U0197 and check for related codes and module presence on the network.
Check fuses and supply voltages at the phone control module connector; verify key ON battery voltage and good ground.
Visually inspect and disconnect/reconnect the module connector(s); look for bent pins, corrosion, water intrusion, or pushed-out terminals.
With scanner connected, attempt to communicate with the phone control module. If no response, backprobe CAN/LIN and supply pins and monitor communication while a known-good module response is attempted.
Measure CAN High/Low voltages and differential; measure termination resistance between CAN high and CAN low with ignition OFF. Replace/add missing termination if required.
If CAN wiring shows short to battery/ground or opens, trace and repair harness faults (repair, replace sections, or repair pins as needed).
If wiring and power/ground are good but module does not respond, check for required software updates or reprogramming procedures from manufacturer before replacing module.
If replacing module, ensure proper programming/coding and re-run communication checks and full system scan. Clear codes and perform functional test (pair phone, test hands-free calls).
If problem is intermittent, perform wiggle testing and road test while monitoring network traffic or capture bus data with oscilloscope/diagnostic tool to identify faults under load or vibration.

Likely causes

Blown fuse or missing 12 V supply to phone control module
Corroded or loose connector at module or gateway module
CAN high/low or LIN wiring shorted to battery or ground
Broken CAN bus termination (open or incorrect resistance)
Phone control module internal fault or failed processor
Recent software update or module replacement left unprogrammed

Fault status

⚠️ Status

Lost communication with the phone control module — module not responding on vehicle network (CAN/LIN).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

Repair manuals

Manual library for LAND ROVER

160

Browse 160 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 :)

Was this AI description helpful?

Your feedback helps improve AI descriptions.

👍 Like 0 👎 Dislike 0

Send to email

U0197 — Lost communication with the phone control module