Code
C1356
Generic
C — Chassis
ABS module communication fault
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UK: 4
EN: 4
RU: 2
AI status
Completed
Completed
100%
Causes
- Open, shorted or corroded wiring/connectors between ABS module and vehicle data bus
- Blown fuse or lost power to ABS module
- Bad ground at ABS module
- Failed ABS control module
- Faulty gateway or ECU on the same communication bus
- Improper module programming or software mismatch
Symptoms
- ABS warning lamp illuminated
- Brake warning or traction control light on
- Loss or disablement of ABS or traction control functions
- Messages such as 'Service ABS/Brake System' or 'Check Brake System' on dash
- Intermittent faults or multiple communication-related codes
- Other modules reporting lost communication with ABS
What to check
- Read and record all stored and pending codes from ABS and network modules with a scanner
- Inspect battery condition and charge; verify vehicle battery voltage (12.4–14.8 V with engine running)
- Check relevant fuses and relays for the ABS module
- Visually inspect ABS module connector for corrosion, bent/broken pins, moisture or debris
- Back-probe power and ground pins at the ABS module to verify proper supply and good ground
- Measure CAN bus voltages on CAN_H and CAN_L at the ABS connector and at other network nodes
Signal parameters
- Module supply: battery voltage ≈ 11–14.8 V with key on / engine running
- Module ground: ≈ 0 V (low resistance to chassis ground)
- CAN bus idle voltages (typical): CAN_H ≈ 2.5–2.75 V, CAN_L ≈ 2.25–2.5 V
- CAN dominant state: differential ≈ 1.5–2.5 V (CAN_H ~3.5 V, CAN_L ~1.5 V when active)
- Termination resistance: approx. 60 ohms across CAN_H and CAN_L (two 120 ohm terminators in parallel)
- Wire/connector continuity: near 0 ohms between module pins and harness splice points
Diagnostic algorithm
- Connect a professional scan tool and retrieve all ABS and network module codes and freeze frame data; note related U-codes.
- Clear codes and attempt to reproduce. If code returns, proceed with electrical checks.
- Verify battery voltage and charge state. Inspect and test ABS-related fuses and relays.
- Visually inspect ABS module connector and wiring for corrosion, water intrusion, broken pins, or damage.
- Back-probe and confirm constant and switched power at the ABS module power pins with ignition on, and verify a solid ground reference.
- Measure CAN_H and CAN_L voltages at the ABS connector and at another known-good node; compare to typical values.
- With ignition off, measure resistance between CAN_H and CAN_L to confirm ~60 ohm termination. Check for shorts to battery or ground on each line.
- Wiggle the ABS harness and connectors while monitoring the bus with the scan tool or oscilloscope to locate intermittent faults.
- If bus wiring and power/ground are good, scope the CAN lines to view noise or missing frames; identify which node (module) is not transmitting or is flooding.
- If another module on the same bus shows errors, isolate by disconnecting suspect modules (one at a time) to find the faulty unit.
- If wiring and external components check good, follow manufacturer procedure for ABS module reprogramming or replacement. After repairs, clear codes and road-test to verify.
Likely causes
- Damaged or loose connector at the ABS module
- Poor power or ground to the ABS module (fuse, wiring, chassis ground)
- Corroded or shorted CAN bus wiring or poor termination
- Failed ABS module electronics
- Faulty network gateway or another module causing bus errors
Fault status
Status
ABS control module communication fault detected — the ABS module is not communicating properly on the vehicle network. May be intermittent or constant; related network U-codes can be present.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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