U0136

Code

LAND ROVER U — Network/User

Lost communication with rear differential control module

Brand: LAND ROVER

Type: U — Network/User

Views: UK: 18 EN: 54 RU: 24

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or shorted CAN bus wiring to the rear differential control module
Corroded, damaged or loose connector at the rear differential control module
Blown fuse or loss of power/ground to the rear diff module
Failed rear differential control module (hardware or internal software)
Faulty CAN bus termination or excessive bus resistance/noise
Intermittent wiring damage from chafing, water ingress, or body movement

Symptoms

Rear differential/4WD/AWD warning or fault message in instrument cluster
Reduced traction, limited 4WD engagement, or vehicle in limp/limited performance mode
ABS/traction control or stability warning lights may be illuminated
No live data or status messages available from rear differential module on a scan tool
Intermittent or permanent loss of certain drivetrain functions that depend on rear diff

What to check

Use a capable diagnostic scan tool and confirm U0136 and any related U-codes present
Check if the rear differential control module appears in the vehicle network list (module present/response)
Visually inspect the rear differential module connector and harness for corrosion, broken pins, water ingress, or physical damage
Check related fuses and main power/ground circuits for the rear differential module
Scan for other communication codes on the same CAN bus (indicates wider bus problem)
Backprobe module power and ground with key ON to confirm battery voltage and good ground

Signal parameters

Module supply (key ON): ~12 V (battery voltage) at module power pin; no-load difference >11 V indicates supply present
Module ground: near 0 V; excessive resistance/voltage drop can cause comm loss
CAN bus recessive state: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V measured to chassis; differential ≈ 0 V
CAN bus dominant state: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ~2.0 V) during traffic
Termination resistance between CAN_H and CAN_L (with ignition OFF and connectors disconnected as required): approx. 60 Ω (two 120 Ω in parallel) for a typical two-terminator network
Expected network behavior: periodic heartbeat/status messages from rear diff module when healthy — absence of its message ID indicates lost comm

Diagnostic algorithm

Retrieve freeze frame, live data and all stored codes. Note time stamps and any network-related codes alongside U0136.
Check if other modules on the same CAN bus are reporting communication faults. If multiple modules are affected, suspect common bus power/termination/short.
Perform a visual inspection of the rear differential module connector and wiring for damage, corrosion or water intrusion. Repair any obvious faults.
Verify fuses and measure battery voltage at the module’s power pin with key ON. Confirm good ground at module mounting point and connector ground pin.
With a DVOM, measure CAN_H and CAN_L voltages at the module connector with the ignition ON. Compare to expected signal_params. If voltages are abnormal, trace the wiring for opens/shorts.
Measure termination resistance across CAN_H and CAN_L (follow manufacturer procedure: ignition OFF, isolate bus if needed). Replace missing/incorrect termination resistors or repair bus wiring.
If voltages look correct but module does not respond, capture bus traffic with an oscilloscope or CAN bus analyzer to confirm whether the rear diff module transmits any frames. Look for noise, reflections or missing dominant/recessive transitions.
Perform a wiggle test and move harness along routing while monitoring for intermittent changes in bus voltage or module presence. Repair chafed or intermittent wiring.
If power, ground and bus signals are good but module still fails to communicate, consult manufacturer service info for possible software issues and perform module reflash or replacement as directed.
After repairs, clear codes, confirm the module appears on the bus, verify live data and perform a driven functional check of drivetrain systems. Re-scan to ensure U0136 does not return.

Likely causes

Damaged or corroded connector at the rear differential module
Open/short on the local CAN high/low pair feeding the module
Loss of module supply voltage or ground (blown fuse, disconnected ground)
Module failure or internal software fault after a collision or water intrusion

Fault status

⚠️ Status

Lost communication with rear differential control module — rear diff module not responding on the vehicle network.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

Repair manuals

Manual library for LAND ROVER

413

Browse 413 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

U0136 — Lost communication with rear differential control module