U0132

Code

HYUNDAI U — Network/User

Lost Communication With Ride Level Control Module

Brand: HYUNDAI

Type: U — Network/User

Views: UK: 6 EN: 11 RU: 17

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Blown fuse or loss of power/ground to the ride level control module
Open or shorted CAN bus wiring between the module and the rest of the network
Corroded, damaged or poorly seated connector at the ride level control module
Failed ride level control module (internal fault)
Fault in another module on the same CAN network causing bus errors or dominant state
Software/firmware mismatch or module not configured after replacement

Symptoms

DTC U0132 stored (may be current or intermittent)
Ride height/air suspension warnings or limp mode for suspension functions
Related body or instrument cluster warnings may appear
Suspension may stay at one height or not respond to controls
Other modules on same bus may show communication errors or strange behavior

What to check

Scan all modules; record freeze frame and related U-codes
Check battery voltage (key ON) — low battery can disrupt network
Inspect fuses and relay for ride level control module power feed
Visually inspect ride level control module connector for corrosion, bent pins, water damage
Check for recent work/aftermarket installations that may have disturbed CAN wiring
Use scan tool to attempt communication with the ride level module (request live data/ID)

Signal parameters

CAN bus idle (recessive): both CAN_H and CAN_L ~2.5 V (approx)
CAN dominant state: CAN_H rises ~3.5 V, CAN_L falls ~1.5 V (differential ~2V)
Expected: periodic CAN messages from the ride level module after ignition on — absence indicates no transmission
Bus termination: ~60 ohm from CAN_H to CAN_L at one end (total ~120 ohm across bus)

Diagnostic algorithm

Retrieve all DTCs and freeze-frame data from all modules. Note history and occurrence pattern (key on/off, driving, after wash).
Check battery voltage and charging system; ensure stable >12.5 V during tests. Low voltage can prevent module communication.
Inspect fuses and relays for the ride level control module circuit; replace any blown fuses and re-check code.
Visually inspect the module connector and surrounding harness for corrosion, water damage, pin deformation, or chafing. Repair or clean as required.
With ignition ON, use a scanner to request the ride level module. If no response, check module power and ground circuits at the connector (test for battery and chassis ground).
Measure CAN_H and CAN_L voltages at the ride level module connector with ignition ON. Compare to expected recessive/dominant values. If bus is held dominant or shorted, isolate sections of harness to find short.
Check continuity of CAN pair between the module and gateway/BCM and between other nodes on the same bus. Verify proper termination resistance (~120 ohms total across CAN_H/L).
If wiring, connectors, power and ground are good but no communication, try swapping or interrogating another known-good module on same bus (if applicable) or temporarily connect a known-good CAN node to verify bus functionality.
If module responds inconsistently, perform wiggle test while watching live bus activity to find intermittent faults.
If module is confirmed powered, properly grounded, and bus is healthy but still non-responsive, consider module failure or required software reflash/configuration — follow manufacturer procedure for replacement/reprogramming.
Clear codes and retest; confirm normal communication and operation before returning vehicle to service.

Likely causes

Loss of module supply or ground (blown fuse, disconnected/loose ground)
Open/broken CAN_H or CAN_L between module and gateway or BCM
Short to battery or short to ground on CAN wires causing bus to be held dominant
Corrosion/water ingress in connector pins at the module
Failed ride level control module electronics

Fault status

⚠️ Status

Lost Communication With Ride Level Control Module — the ride level module is not responding on the vehicle communication bus (CAN).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.5-3.0 hours

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U0132 — Lost Communication With Ride Level Control Module