B136E

Code

LAND ROVER B — Body

Infotainment Control Module: CAN Communication Fault

Brand: LAND ROVER

Type: B — Body

Views: UK: 13 EN: 22 RU: 13

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Page language: EN

Causes

Damaged or chafed CAN wiring (CAN H / CAN L)
Corroded/loose connector at the infotainment module or elsewhere on the CAN trunk
Short to battery or ground on CAN H or CAN L
Missing or incorrect bus termination (open/failed 60 Ω termination)
Faulty infotainment control module hardware or internal CAN transceiver failure
Low battery/unstable supply voltage or poor ground at the module

Symptoms

Infotainment unit intermittently or permanently unresponsive
Loss of radio, navigation, Bluetooth, or screen functions
Multiple network-related messages or warning icons on dash
Other modules on the same network reporting communication faults
Vehicle diagnostics cannot communicate with the infotainment module or sees timeouts
Intermittent function restoration after ignition cycles or wiggling connectors

What to check

Read and record all stored codes and freeze frame data from infotainment and related modules
Check for other U- or B- codes on associated CAN networks (gateway nodes)
Attempt communication with the infotainment module using a diagnostic scan tool
Visually inspect connectors, pins and harness for corrosion, damage, bent pins, or moisture
Inspect for aftermarket device connections to the CAN trunk and disconnect for test
With ignition off, measure resistance between CAN H and CAN L at module connector — should be ~60 Ω (two 120 Ω terminators in parallel)

Signal parameters

Recessive (idle) — CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (both near mid-supply)
Dominant state — CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (approx. 2.0 V differential)
Typical differential amplitude (dominant) ≈ 2.0 V
Expected bus resistance (ignition off) ≈ 60 Ω between CAN_H and CAN_L (two 120 Ω terminators in parallel)
Common bitrates: 500 kb/s or 250 kb/s (verify vehicle‑specific network speed)
Supply voltage to infotainment ≈ battery voltage (approx. 12 V) with minimal drop; ground resistance should be low (

Diagnostic algorithm

Confirm B136E is current or historic and note any related U or B codes. Record freeze frame data.
Attempt to communicate with the infotainment module using a factory-level or capable scan tool. Note whether the module responds and any bus errors or timeout messages.
Visually inspect the infotainment unit connectors and harness for damage, corrosion, water ingress or loose pins. Repair or clean as required.
Verify 12 V supply and ground at the infotainment connector with ignition in the correct position. Repair any supply/ground issues before further testing.
With ignition off, disconnect the infotainment connector and measure resistance between CAN_H and CAN_L at the module harness — expect ~60 Ω. If open or far from 60 Ω, inspect terminators and wiring.
With ignition on, measure CAN_H and CAN_L voltages at the infotainment connector relative to ground and measure differential using an oscilloscope if available. Compare to expected signal_params.
Check for shorts: measure CAN_H to battery + and to ground, and CAN_L to battery + and to ground. Look for shorts to power or ground.
If physical wiring and supplies check good, disconnect other devices on the same CAN trunk (amplifier, telematics, gateway nodes) one at a time to see if bus communication is restored — isolate a noisy node.
If bus wiring and other nodes are OK, consider reflashing/updating infotainment software per manufacturer service instructions, then clear codes and retest.
If fault persists after wiring and software checks, consider replacement of the infotainment module or its internal CAN transceiver; retest after replacement.
After repairs, clear codes, verify normal CAN traffic across the network, and road test to ensure fault does not return.

Likely causes

Open or shorted CAN wires at harness/connector near the infotainment module
Failed CAN transceiver inside the infotainment module
Failed/missing CAN termination resistor(s)
Loose or corroded ground or +12V supply to the infotainment module
Aftermarket device connected to CAN network creating noise or short

Fault status

⚠️ Status

Infotainment Control Module - CAN communication fault reported (B136E). Module not receiving or transmitting valid CAN messages; check wiring, power/ground, termination, and other nodes on the CAN network.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.5 - 3.0 hours

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